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WITH AMPLIFIER

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381 - Electrical audio signal processing systems and devices

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Class / Patent application numberDescriptionNumber of patent applications / Date published
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DocumentTitleDate
20130028448AUDIO SIGNAL PROCESSING METHOD AND AUDIO SIGNAL PROCESSING APPARATUS THEREFOR - An audio signal processing apparatus and method are provided. The apparatus includes a stability determiner and a sigma-delta modulator. The stability determiner divides a frequency band of an input audio signal into one or more sub-frequency bands, compares a level of the input audio signal for each of the sub-frequency bands with a threshold for the sub-frequency band, and generates a stability determination signal according to a result of the comparison. The sigma-delta modulator sigma-delta modulates the input audio signal according to the stability determination signal, and outputs a modulation signal.01-31-2013
20100074457SOUND REPRODUCING SYSTEM WITH SUPERIMPOSED DIGITAL SIGNAL - The invention provides a Hi-fi sound system for the digital transfer of sound information from a digital signal source (03-25-2010
20130039515SPEAKER COMPONENT, SPEAKER USING SAME, ELECTRONIC APPARATUS, AND MOVING MEANS - Provided is a speaker diaphragm or a speaker voice coil bobbin manufactured by a papermaking method and including metal hydroxide by at least an amount of 30 wt % or greater. With this, it is possible to improve rigidity and achieve favorable acoustic quality by an effect of mixing metal hydroxide. Moreover, it is possible to provide a paper-made diaphragm or a voice coil bobbin with flame retardancy without increasing weight or cost.02-14-2013
20130034250AMPLIFIER - Disclosed is an amplifier with which output signal distortion can be reduced, and deterioration in power efficiency can be reduced. The amplifier is provided with a power supply voltage control unit (02-07-2013
20130034249SOLID STATE AUDIO POWER AMPLIFIER - A solid-state audio power amplifier providing an instantaneous maximum output voltage capability in excess of its long term power output capability, in which the input signal is supplied from analogue or digital signal processor. The signal processor is arranged to limit the long term power output of the solid-state amplifier in a non-linear amplitude and frequency dependant manner02-07-2013
20130034248AUDIO RECORDING AND PLAYBACK DEVICE, AND POWER FEED METHOD FOR AUDIO RECORDING AND PLAYBACK DEVICE - An audio recording and playback device, of the present invention, capable of recording and playing back audio, comprises an audio input section for converting audio input during an audio recording operation into an electrical audio signal, a power feed section for carrying out power feeds to the audio input section by means of a balanced transmission line, an amplifier section for amplifying the audio signal, a boost section for generating a power feed voltage to be applied to the balanced transmission line and outputting to the power feed section, a output voltage changing section for carrying out control to vary the output voltage of the boost section, and a control section for controlling the power feed voltage of the power feed section by controlling the power feed section and the output voltage changing section.02-07-2013
20130077806AMPLIFIER APPARATUS - Disclosed is a technique for reducing noise superimposed on an output signal while keeping loop gain constant without increasing the circuit scale and without changing the transfer function of the amplifier apparatus (frequency characteristics of gain and phase). According to the technique, there are included a power-supply voltage control unit 03-28-2013
20120207331PREAMPLIFIER CIRCUIT AND MICROPHONE HAVING THE SAME - A preamplifier has first and second PMOS transistors each functioning as a source follower. Furthermore, the preamplifier circuit has third and fourth PMOS transistors functioning in pairs as a differential amplifier. A gate of the first transistor and a gate of the fourth transistor are coupled together through a second variable capacitor. A gate of the second transistor and a gate of the third transistor are coupled together through a first variable capacitor. A source of the first transistor and a drain of the third transistor are coupled together. A source of the second transistor and a drain of the fourth transistor are coupled together. A source of the third transistor and a source of the fourth transistor are coupled together.08-16-2012
20100098268HIGH-VOLTAGE OUTPUT AMPLIFIER FOR AUDIO SYSTEMS - An amplifier circuit having low-voltage transistors and being configured to operate at a high voltage level is provided. The amplifier circuit includes a driver circuit having a first stage and a second stage connected in series between a power supply and a ground. The driver circuit has a control terminal for receiving a signal for controlling a current flow in the output driver. The amplifier circuit also includes a switch transistor having a drain connected to the power supply, a source connected to the control terminal of the output driver, and a gate. A bias circuit is coupled to the switch transistor. In a first mode of operation, the bias circuit is adapted to turn off the switch transistor, and, in a second mode of operation, the bias circuit is adapted to turn on the switch transistor. The bias circuit is adapted to maintain a gate-to-drain voltage of the switch transistor within a predetermined voltage range.04-22-2010
20090154732AUDIO PLAYING MODULE AND METHOD OF THE SAME - An audio module used for a display device is disclosed. The display device has a display substrate. The audio module has a filter, an amplifier, and at least one output unit. The filter receives and filters an audio signal to generate a filtered signal. The amplifier is coupled to the filter and amplifies the filtered signal to generate an amplified signal. At least one output unit is coupled to the amplifier and plays the amplified signal in a predetermined way.06-18-2009
20080267429Modular Speaker System - A modular speaker system includes a base assembly having a longitudinally extending, central support member and a support leg extending therefrom in a manner supporting the central support member in a generally upright configuration. The central support member includes a first end and a second end. A first woofer is secured to the base assembly, and a base assembly amplifier is mounted within the central support member and connected to the first woofer. An auxiliary speaker assembly includes a longitudinally extending, auxiliary support member having a first end a second end, the first end being shaped and dimensioned for selective engagement with the second end of the central support member. A first driver is secured to the auxiliary speaker assembly and an amplifier is mounted within the auxiliary support member and is connected to the first driver.10-30-2008
20120183159MODE SWITCHING NOISE CANCELLATION FOR MICROPHONE-SPEAKER COMBINATIONS USED IN TWO WAY AUDIO COMMUNICATIONS - An audio host device has an electrical interface having a speaker contact, a microphone contact, and a reference contact. The reference contact is shared by a microphone and a speaker. The reference contact is also directly coupled to a power return plane of the audio host device. A difference amplifier is provided, having a cold input and a hot input. The hot input is coupled to the microphone contact. A switched attenuator circuit is also provided that has first and second states. In the first state, the attenuator circuit couples a sense point of the reference contact to the cold input, while in the second state the cold input is isolated from the reference sense point. Other embodiments are also described and claimed.07-19-2012
20120183158MODULAR SPEAKER SYSTEM - A modular speaker system includes a base assembly having a longitudinally extending, central support member and a support leg extending therefrom in a manner supporting the central support member in a generally upright configuration. The central support member includes a first end and a second end. A first woofer is secured to the base assembly, and a base assembly amplifier is mounted within the central support member and connected to the first woofer. An auxiliary speaker assembly includes a longitudinally extending, auxiliary support member having a first end and a second end, the first end being shaped and dimensioned for selective engagement with the second end of the central support member. A first driver is secured to the auxiliary speaker assembly and an amplifier is mounted within the auxiliary support member and is connected to the first driver.07-19-2012
20120183157STRUCTURE FOR AMPLIFIER - An improved structure for an amplifier comprises: a single member, which at least has a frame, an edge and a membrane; and a positioning shrapnel, which is assembled by an inner frame, an outer frame and a plurality of flexible braces, the outer frame is firmly disposed at the frame of the single member, the plurality of flexible braces is disposed between the inner frame and the outer frame, the inner frame is firmly disposed on the membrane of the single member, wherein the peripheral of the frame has a fillister that can be embedded in by the outer frame, each connection of any of the flexible braces and the inner frame is a curve portion that is to keep the connection of the inner frame and the outer frame while a height difference is existed between the inner frame and the outer frame.07-19-2012
20130083947AUDIO AMPLIFIER - An audio amplifier may comprise a signal limiting circuit and a power amplifier. The signal limiting circuit may be configured to limit an audio signal received at an input and to provide it as a limited audio signal at an output. The power amplifier may have a supply connection which may be coupled to a power supply unit in order to supply power to the power amplifier. The power amplifier may be configured to amplify a signal, which may be based on the limited audio signal, and to provide it as a level-limited audio signal at an output which may be coupled to a load, so that the load may be operated at limited power. The signal limiting circuit may be configured to produce an audio signal which may be limited depending on the load.04-04-2013
20100329484Audio Amplifier Attachable to Speaker System by Way of Magnetic Coupler and Method Therefor - An audio system comprises a first enclosure for housing a first audio component and a second enclosure for housing a second audio component. The first enclosure includes a surface having a plurality of first structures, the first structures comprising one selected from a group consisting of a plurality of protrusions and a plurality of receptacles. The second enclosure includes a surface having a plurality of second structures, the second structures comprising the other one from the group consisting of the plurality of protrusions and the plurality of receptacles. The protrusions are configured to be inserted into the receptacles along a first direction such that the first enclosure is maintained in a first position relative to the second enclosure in the presence of a shear force that is applied in a direction that is perpendicular to the first direction.12-30-2010
20130089223Output Power Limiter in an Audio Amplifier - An output power limiter system (PLS) for audio amplifiers may be designed as a feedback control system for protection of the load and/or quality of the audio experience. The PLS may use comparator to sense the output current, compare it to a specified threshold, and assert a signal when the output current reaches and exceeds the specified threshold. The output signal from the comparator may enable a counter that is clocked with a high frequency clock to begin counting to measure the pulse-width of the comparator output. The output of the counter may be averaged through a fast attack and slow release infinite impulse response (IIR) filter having programmable settings to generate a rate of attenuation or rate of release that adjusts a gain correction in terms of decibels (dB). The output of the IIR filter may then be used for attenuating the output current.04-11-2013
20090041268Signal Amplifying Apparatus, Amplification System, and Signal Amplification Method - An amplification system of the invention can decrease power consumption in a power amplification section if the power amplification section need not be used. The power consumption in the power amplification section can be decreased by shutting off power feed into a voltage amplification stage by a power control section, and the power feed state into a power amplification stage from a power supply section is not changed. Thus, power feed into the voltage amplification stage of the circuit wherein a large current does not flow needs only to be controlled using limiter means also used for a different application, so that the power consumption of the power amplification section can be decreased without the need for enlarging the circuit scale, with saved space, and simply.02-12-2009
20090092267SWITCHING AUDIO POWER AMPLIFIER WITH DE-NOISE FUNCTION - The invention provides a switching audio power amplifier with de-noise function, including a first comparator, a second comparator, a logic control unit, a de-noise circuit, and a bridge circuit. The first comparator and the second comparator respectively generate the first PWM signal and the second PWM signal, and then the logic control unit performs logic operation to generate a third PWM signal and a fourth PWM signal. If the pulse width of the third PWM signal (or the fourth PWM signal) is lower than a threshold, the de-noise circuit increases the pulse width of the third PWM signal or the fourth PWM signal and outputs the fifth PWM signal and the sixth PWM signal to drive the bridge circuit. Next, the bridge circuit conducts a driving current alternately flowing to and from a load according to the firth PWM signal and the sixth PWM signal.04-09-2009
20130058504MULTI-MODE AUDIO AMPLIFIERS - A multimode audio amplifier comprises: a mode controller adapted to provide a control signal; and at least one multimode module, wherein each of the multimode modules has a plurality of operating modes, wherein the operating modes are selected in accordance with the control signal, wherein changing the operating modes results in a measurable change in at least one characteristic of the multimode audio amplifier; wherein the characteristics of the multimode audio amplifier consist of signal to noise ratio (SNR); total harmonic distortion and noise (THD+N); input to output delay; power consumption; and efficiency.03-07-2013
20130058505CIRCULAR LOUDSPEAKER ARRAY WITH CONTROLLABLE DIRECTIVITY - The invention relates to a sound-emitting device with controllable directivity comprising a plurality of sound sources (03-07-2013
20130064397MICROPHONE AMPLIFIER - A microphone amplifier comprises a microphone terminal for connecting a microphone, particularly a MEMS microphone, and an amplifier circuit with an amplifier input that is connected to the microphone terminal, and with an amplifier output that is connected to an output of the microphone amplifier. The amplifier circuit is designed to amplify an input signal present at the amplifier input in order to generate an output signal at the amplifier output. The microphone amplifier further comprises an overload circuit that is designed to detect an overload state within the amplifier circuit and to connect the amplifier input via a switching element, in particular with a low impedance, to a reference potential terminal if the overload state is detected for more than a predetermined time span.03-14-2013
20130064398Class-AB/B amplifier with quiescent control circuit - Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.03-14-2013
20130163789AMPLIFIER AND AMPLIFYING METHOD - An amplifier that modulates a carrier frequency according to a digital signal and amplifies the modulated signal includes a determining portion that determines at least one of a sound quality required for the digital signal, a sound source of the digital signal, and a type of sound of the digital signal, a carrier frequency setting portion that sets a carrier frequency according to a result of the determination, and a pulse-width modulating portion that pulse-width modulates the carrier frequency according to the digital signal.06-27-2013
20090238382AUDIO REPRODUCTION SYSTEM - The audio reproduction system amplifies and reproduces both a digital audio signal and an analog audio signal. After delta sigma modulation by a ΔΣ modulator, the digital audio signal is pulse width modulated by a first PWM converter and supplied to a selector. The analog audio signal is compared with a PWM carrier signal by a second PWM converter, converted to a PWM signal, and supplied to the selector. A signal selected by the selector is then amplified by a class D amplifier.09-24-2009
20130163788POWER SUPPLY CIRCUITS FOR AUDIO AMPLIFIERS - Several amplifier power circuits and methods for powering an audio amplifier are described. An AC line voltage is rectified and selectively coupled to a filter capacitor in response to a switch control signal. The filter capacitor is charged to generate an amplifier supply voltage signal, which is used to power the audio amplifier. A controller generates the switch control signal in accordance with a leading control approach or a lagging control approach.06-27-2013
20090010457AUDIO SIGNAL AMPLIFYING CIRCUIT AND ELECTRONIC DEVICE USING THE SAME - In an audio signal amplifying circuit, a main amplifier and a sub amplifier amplify an audio signal. The sub amplifier is disposed in parallel with the main amplifier and also is set to have a lower driving capability than the main amplifier. A control unit controls the on and off of the main amplifier. The control unit turns the main amplifier off when it is determined that the audio signal is in a mute state. An audio signal amplified by the main amplifier and the sub amplifier passes through a low-pass filter to be converted into an analog signal and is output to a speaker.01-08-2009
20130163787Electronically Orbited Speaker System - Exemplary embodiments are directed to a sound modification system and loud speaker system. The system may impose amplitude and frequency modulation on to a signal representing the output of an electrical musical instrument or other sound source while also imposing a sense of movement of the sound to the listener. Further, the system may simultaneously amplify sound signals without the amplitude, frequency and spatial sense of modulation or a different sense of modulation. The system combines a plurality of speaker transducers, a plurality of amplifiers and digital signal processors to provide a flexible, portable and practical sound modification and amplification system.06-27-2013
20120237059ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a terminal, an amplifier, a speaker, a power supply circuit, a first switch and a first controller. The terminal configured to input an audio signal from an external device. The amplifier configured to amplify the audio signal which is input from the terminal. The speaker configured to output sound corresponding to the audio signal which is amplified by the amplifier. The power supply circuit connected to the amplifier. The first controller configured to control the power supply circuit in order to supply the power to the amplifier, when the electronic apparatus is in a non-operative state and the first switch is turned on.09-20-2012
20100322441NOTEBOOK POWER SUPPLY WITH INTEGRATED SUBWOOFER - A portable electrical appliance comprises an audio signal source, a power supply module having a housing external to the portable electrical appliance for providing power to the electronic appliance having, a power converter for providing DC power to at least the portable electrical appliance, a speaker for generating sound and audio processing means for manipulating audio signals from the audio signal source, wherein the power converter, audio processing means and speaker are mounted within the housing, and communication means for coupling the audio signal to the processing means. The communication means is able to be wireless or wired.12-23-2010
20110096944HIGH PERCEIVED AUDIO QUALITY CLASS D AMPLIFIER - An audio amplifier and a method of operating such an amplifier are disclosed. The audio amplifier includes a switch disabling controller and/or an output set-point controller. The switch disabling controller is configured to disable switching of an output switch circuit or other switch circuit while an input signal represents at least relative silence. The output set-point controller is configured to bring and/or hold first and second switch nodes toward and/or at a set-point voltage while the input signal represents at least relative silence.04-28-2011
20090060229WIRELESS SYSTEM FOR SHARING AUDIO SIGNAL - An audio system includes an audio enabled device, a transmitter and at least one receiver. The audio enabled device has a school and office product and an amplifier integrated with the school and office product. The audio enabled device is configured such that when the amplifier receives an electronic audio signal the amplifier and the school and office product cooperate to provide an audible audio output. The transmitter is connectable to the amplifier and configured to wirelessly transmit the electronic audio signal. Each receiver is connectable to the input port of an amplifier, and each such receiver is configured to receive the electronic audio signal transmitted by the transmitter.03-05-2009
20090034757SERIALIZER FOR MULTIPLE APPLICATIONS - A serializer/deserializer interfaces a microprocessor/controller with I/O devices over a flexible hinging cable. The I/O devices have parallel interfaces as does the controller but the serializer/deserializer reduces the number of signal that traverse the flexible hinging cable. LCD displays, cameras, keypads and audio signals handled by the invention.02-05-2009
20080267428Digital audio horn - A device for producing sound amplification having a control module operably associated with a digital sound device, and an amplifier connected to and supporting the digital sound device. The control module provides at least one input signal to the digital sound device, and the digital sound device receives an input signal from the control module, causing the digital sound device to produce a vibration, and causing the amplifier to increase the magnitude of the vibration.10-30-2008
20080212804Sound receiver - In a sound receiver, a sound wave is directly received by microphones at a predetermined phase difference. The microphones are arranged in opening cavities of a casing, at positions that are different from the volume center points of the opening cavities. The microphones are supported by supporting springs in a state of not closely contacting inner peripheral walls. The sound wave received by the microphones is input to a signal processing unit and after a signal component in a predetermined low frequency band is removed by a filter, the resulting sound wave is amplified by an amplifier and is made in phase by a phase shifter and output.09-04-2008
20120099743CLASS D AMPLIFICATION DEVICE - A controller 04-26-2012
20120099742AUDIO JACK WITH ESD PROTECTION - A plug-and-jack for use with an electronic device that is configured to ensure circuitry of the device is protected from electrostatic discharge. In one case, the jack is an audio jack designed to protect high gain circuitry of the device against electrostatic discharge from the leads of an audio plug. The jack includes a mechanical switch that only connects the high gain circuitry to the appropriate portion of the audio plug once the audio plug is fully inserted. At the same time, the mechanical switch also connects the high gain circuitry and corresponding portion of the audio plug to an electrostatic discharge circuit.04-26-2012
20110286611DIGITAL AMPLIFIER - A digital amplifier is described with decreased high-frequency noise current flowing into GND via a capacitor in a low-pass filter output. Consequently output sound quality is improved because AC loops of noise current that occur are balanced while each switch is turned on.11-24-2011
20090196439ARTICULATED AMPLIFIER - An audio amplifier having a variably configurable housing, which may be mounted to an interior surface of a motor vehicle. The housing is formed in two complementing housing sections mutually joined by a hinge, tether, or other connector. A power supply is contained in one housing section and an audio output module is contained in the other housing section. The power supply and audio output module may be connected by flexible signal conductors to accommodate pivot of the two housing sections relative to one another. A heat sink comprising cooling fins and communications and power terminals may be disposed on the exterior of the housing sections to enable conventional connection to an associated audio system. The hinge may incorporate a fixing element which releasably holds the two housing sections at a selected degree of pivot.08-06-2009
20090154731AUDIO PLAYBACK APPARATUS - An audio playback apparatus is disclosed. The audio playback apparatus processes an audio signal and provides at least one output signal to at least one speaker or an earphone connected to a phone-jack. The audio playback apparatus comprises a clock generating module, a processing module, an amplifier module, and a detecting module. The processing module is connected to the clock generating module and processes the audio signal to generate a processed signal according to a clock signal generated by the clock generating module. The amplifier module amplifies the processed signal to generate an output signal. The detecting module detects whether the earphone is plugged in the phone-jack. If the earphone is plugged in the phone-jack, the amplifier module provides the output signal to the earphone. If not, the amplifier module provides the output signal to the speaker.06-18-2009
20100034401AUDIO PLAYER WITH ILLUMINATION EFFECT - An audio player with illumination effect has an audio play host and a lighting box. The audio play host has a housing in which speakers, a circuit board and a power amplifiers are mounted. The housing further has audio signal connectors, buttons and a display and is defined with at least one mounting hole. The lighting box is mounted on the audio play host and has a casing, at least one lamp socket and at least one lamp. The lamp socket with two ends respectively extends into the housing and the casing to electrically connect the circuit board and hold the lamp. In addition to amplify and output an audio signal from the audio signal connectors, the control circuit determines on and off operations and illuminating intensity of the lighting box.02-11-2010
20090154733AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.06-18-2009
20110261978Electronic Apparatus - According to one embodiment, an electronic apparatus includes a speaker, a terminal, a first detector, a second detector, an amplifier, a power supply circuit and a control module. The terminal is configured to connect an external device via a connection member, the external device outputting an audio signal. The first detector is configured to detect that the connection member is connected to the terminal. The second detector is configured to detect that the audio signal is received via the terminal. The amplifier is configured to amplify the audio signal and to produce sound from the speaker. The controller is configured to control the power supply circuit to supply power to the amplifier, when the first detector detects that the connection member is connected to the terminal, the second detector detects that the audio signal is received, and the electronic apparatus is in an inoperative state.10-27-2011
20090141911ACOUSTIC PROCESSING DEVICE AND ACOUSTIC PROCESSING METHOD - An acoustic processing device, includes an inputting section which receives a first audio signal and a second audio signal, a first input signal amplifying section which amplifies the first audio signal at an amplification factor, a second input signal amplifying section which amplifies the second audio signal at an amplification factor, a first initial delayed amplifying section, a first adding section which adds the first audio signal amplified by the first amplifying portion and the first audio signal amplified by the first input signal amplifying section, a second adding section which adds the first audio signal amplified by the second amplifying portion and the second audio signal amplified by the second input signal amplifying section, a first supplying section which supplies an audio signal output from the first adding section to a first sound emitting section, and a second supplying section which supplies an audio signal output from the second adding section to a second sound emitting section different from the first sound emitting section.06-04-2009
20090208036MAGNETIC ALERT DETECTOR - A tone alert amplifier includes a pickup coil, a filter unit, a converting unit, a micro-control unit, an amplifier, and a loud speaker unit. The pickup coil senses a magnetic signal to induce an input signal, and the filter unit performs a specific filtering operation upon the input signal to generate a filtered input signal. Next, the converting unit converts the filtered input signal into the digital signal, and the micro-control unit receives the digital signal to generate at least one output signal. Then the amplifier amplifies the output signal to generate an audio signal, and finally, the speaker unit outputs the audio signal.08-20-2009
20120106760AUDIO AMP WITH SPURIOUS WAVE NOISE REDUCTION CIRCUIT - An audio amplifier with a spurious wave noise reduction circuit according to the present invention comprises: an input unit receiving the audio signal for each channel; a modulation unit converting the audio signal into a pulse width modulation (PWM) signal; an amplification unit amplifying the PWM signal; an output unit extracting the audio signal from the amplified PWM signal to output; a power supply applying power to the input unit, the modulation unit, the amplification unit, and the output unit; and a pulse generation unit generating a first reference signal that is a pulse signal applied to the modulation unit and a second reference signal that is a pulse signal applied to the power supply. In the amplifier of the present invention, the first reference signal is applied to the modulation unit to synchronize the PWM signal with respect to the audio signal for each channel, and the second reference signal is applied to the power supply to synchronize the pulse signal generated in the power supply with the PWM signal to reduce spurious wave noise occurring in the audio amplifier.05-03-2012
20090202087Wireless Microphone Device - To provide a wireless microphone device that enables a circuit board, which is to be provided with an oscillation circuit, to be decreased in size without deteriorating radiation characteristics.08-13-2009
20110170717METHOD AND APPARATUS FOR AMPLIFYING AUDIO SIGNAL - An audio signal amplifying device and method for reducing a size and corresponding power consumption of demodulation filters in the signal amplifying device. In the device and method, carrier waves having phase shifts are generated from a received audio signal. The shifted carrier waves are compared to the audio signal to generate modulation signals, which are amplified based on a power supply voltage. The amplified modulation signals or a power supply signal are output based on a comparison between the carrier waves and the audio signal. The output signals are synthesized to produce a synthesized signal having a lower average voltage and current value, thus reducing power consumption of the signal amplifying device.07-14-2011
20110170716Methods And Apparatus For Variable Solid State-To-Tube Rectification In An Amplifier - Methods and apparatus provide for: a rectification circuit operating to convert a source of AC power into a final DC power source; a rectification filtering capacitance operating to at least partially smooth a voltage of the final DC power source, which exhibits a voltage sag and recovery characteristic in response to time-variant current drawn therefrom; a power amplification circuit drawing power from the final DC power source and producing an output signal, for driving a speaker, having audible characteristics influenced by the voltage sag and recovery characteristic of the final DC power source; and a control circuit operating to continuously vary, in response to user input, one or more parameters of the voltage sag and/or recovery characteristic of the final DC power source.07-14-2011
20080310653Digital audio signal amplifier - A digital audio signal amplifier includes: a digital signal amplifying module having a digital audio signal plug connected with a digital audio signal outlet of a main board to receive digital audio signals, the digital signal amplifying module processing the digital audio signals to generate high power analog audio signals; and an analog signal output interface coupled to the digital signal amplifying module and transferring the high power analog audio signals to a set of speaker.12-18-2008
20100272294TWO-CHANNEL AMPLIFIER WITH COMMON SIGNAL - A two-channel amplifier with common signal including a splitter for establishing three intermediate signals on the basis of two input signals, wherein the three intermediate signals represent two channels, one of the three intermediate signals being a common signal common to both of the two channels and having a representation based on a sum of the two input signals.10-28-2010
20100272293AMPLIFIER CIRCUIT AUDIO CIRCUIT AND ELECTRONIC DEVICE - An amplifier circuit which, includes a first input for receiving a first input signal and a second input for receiving a second input signal. A first amplifier section is connected to the first input and the second input is present. The first amplifier section can combine the first signal and the second signal into a first combined signal, the first amplifier being connected to a first output, for outputting the first combined signal. A second amplifier section is connected to the first input and the second input, for combining the first signal and the second signal into a second combined signal, the second amplifier being connected to a second output, for outputting the second combined signal. A common mode section is connected to the first input and the second input, for generating a common mode signal based on a combination of the first signal and the second signal and outputting the common mode signal at a common output connected to the common mode amplifier. The first combined signal, the second combined signal and the common mode signal satisfy the condition that combining the first combined signal and the common mode signal results in a signal with an amplitude proportional to the amplitude of the first input signal and combining the second combined signal and the common mode signal results in a signal with an amplitude proportional to the amplitude of the second input signal.10-28-2010
20120033834Apparatus With Directivity Pattern - A loudspeaker is described. The loudspeaker includes two or more segmentations of a planar radiator. Each of the segmentations has an associated frequency dependent velocity magnitude and phase with substantially uniform surface pressure. The two or more segmentations provide a substantially uniform radiation pattern across a wide range of acoustic frequencies. Apparatus, computer readable media and methods are also described.02-09-2012
20090285416Speaker Driver Circuit Driven By Postive and Negative Voltages - A speaker driver circuit driven by positive and negative voltages, comprising: at least one operational amplifier providing an output to a headphone speaker, and a voltage converter receiving a supplied voltage (VDD), generating r-fold positive and negative voltages (r·VDD and −r·VDD, wherein r is any positive real number except 1) according to the supplied voltage, and supplying the positive and negative voltages to the operational amplifier for its high and low operation voltage levels respectively.11-19-2009
20080240469Flat-panel television and audio equipment - Disclosed is an audio equipment, comprising: an audio output amplifier and a speaker, with a sound output from the speaker based on an audio signal that is input in the audio output amplifier, and with a high signal output as an error signal to protect the audio output amplifier when an abnormal operation occurs. The audio equipment further comprising a rectifier circuit to stabilize the error signal.10-02-2008
20080240468LANDSCAPE SPEAKER CONNECTOR AND SOUND SYSTEM - This application relates to an outdoor music and sound system. More particularly, this system incorporates unique weatherproof wing nut cable connectors used in connecting a plurality of weatherproof speakers on a single electrical line to a remote sound system that may be employed in a variety of landscape areas. By using 8 ohm, at 20 to 50 watt resistor units, or a 1.5 to 2 ohm receiver amplifier, to control the output, a single cable can be used to connect to a plurality of speakers. Two or more cables may be connected to the electronics unit. This inexpensive system can easily be sold at discount hardware stores in conjunction with the wide variety of inexpensive outdoor lighting systems now available.10-02-2008
20080279399Power Control Apparatus, Speaker Apparatus and Power Control Method - The speaker apparatus according to the invention is arranged in a manner that when the magnitude of an audio signal Sin increases temporarily and so a consumption power increases, a DC-DC converter reduces an output voltage Vout to thereby increase an output current Iout and further discharges a capacitor to thereby increase a current supplied to an amplifier. Thus, a power of 2.5 W or more supplied from a USB connection terminal can be temporarily supplied to the amplifier. Further, since the change of the voltage difference between the both ends of the capacitor can be made large, an amount of the electric charges discharged from the capacitor can be made large and so the size of the capacitor can be reduced11-13-2008
20090080678SPEAKER DEVICE OF MOBILE COMMUNICATION TERMINAL FOR OUTPUTTING HIGH QUALITY SOUND - A speaker device employing a diaphragm structure for providing high quality sound characteristics. In particular, a separate speaker unit is additionally provided so as to improve a resonator characteristic produced at the rear side of an existing speaker. As such, the rear sound arriving at an end of the resonator is dampened by the sound outputted from the additional speaker unit, thereby improving characteristics, such as clearness, total harmonic distortion, etc.03-26-2009
20090180644Integrated and programmable microphone bias generation - A disclosed embodiment is a programmable integrated circuit such as an audio processor or a base band processor for generating a low noise and programmable microphone bias voltage or current. The programmable integrated circuit generates a programmable reference input, where the reference input is programmably generated from at least one power source, such as a on-chip audio power supply, an on-chip power supply, or an off-chip power supply, for use by a regulator. The regulator in the programmable integrated circuit receives a bias input and the programmable reference input and generates a programmable output for biasing a microphone. The bias input for the regulator can be provided by an off-chip power supply or an on-chip power supply. The reference input provided to the regulator can be appropriately filtered to reduce noise. In one embodiment, the programmable reference input and the programmable output are programmed by first and second potentiometers, respectively.07-16-2009
20090185696SOUND SIGNAL TRANSMITTER-RECEIVER - A sound signal transmitter-receiver includes a differential microphone for receiving sounds respectively at first and second points to convert the receiving sounds into a transmission sound signal; a transmission-reception unit for receiving an incoming signal as a reception sound signal; an addition unit for adding the reception sound signal from the transmission-reception unit and the transmission sound signal to produce an addition signal; and a speaker outputting sound based on the addition signal.07-23-2009
20080317263Voice amplification system for signal calling during the play of a sports competition - A system that allows the teammates of an individual (such as a quarterback on a football team) to hear signals being called by that individual during the course of a sports competition, despite noise generated by an audience. The system includes a microphone positioned within the helmet of the signal caller connected to an audio amplification device, either positioned in the helmet or in some other part of the clothing or equipment worn by the signal caller. The amplified signal is then directed to one or more loudspeakers, again positioned either on the helmet of the signal caller or on the clothing or equipment worn by the signal caller. The loudspeakers are directed to the signal caller's teammates, positioned typically along a line of scrimmage. The system may be time-limited in operation in that the signal caller must specifically activate the system which thereafter remains activated only for a pre-set period of time before automatically shutting off. The components of the system may be connected to each other by wired or wireless signal lines.12-25-2008
20090232331AMPLIFIER CONTROLLER - An amplifier controller for controlling a plurality of amplifiers connected therewith is provided. Each of said amplifiers is provided with one or more audio output channels. The amplifier controller operates in two modes of solo mode and normal mode. When the solo mode is initiated, the amplifier controller instructs all of the amplifiers to turn off output of all audio output channels provided in the amplifiers, and only in the solo mode, according to selection of an output channel for which solo output is to be performed, the amplifier controller instructs the amplifier provided with the selected channel to turn on output of the channel, and instructs each of the amplifiers provided with an audio output channel other than the selected channel to turn off output of the audio output channel.09-17-2009
20090110217Digital/Analogue conversion apparatus - A digital/analog conversion apparatus for converting a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter for reducing the number of bits of an input signal, a second data converter for converting the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.04-30-2009
20090220110SYSTEM AND METHOD OF REDUCING POWER CONSUMPTION FOR AUDIO PLAYBACK - A system and method of improving the efficiency in the power consumption of an audio system. In essence, the technique is to adjust the power delivered from the power supply to the analog section, such as the power amplifier, in response to the volume level indicated by the volume control module and/or in response to the detected characteristic of the input audio signal. Thus, in this manner, the analog section is operated in a manner that is related to the level of the signal it is processing. Additionally, the system and method also relate to a technique of adjusting the dynamic ranges of the digital signal and the analog signal to improve the overall dynamic range of the system without needing to consume additional power.09-03-2009
20110142262AUDIO PROCESSING APPARATUS - A switching section causes the first amplification section to amplify the expansion left audio signal and supply the amplified expansion left audio signal to the first speaker terminal and causing the second amplification section to amplify the expansion right audio signal and supply the amplified expansion right audio signal to the second speaker terminal when the Bi-Amp function is not used. The switching section causes the first amplification section to amplify the left audio signal for Bi-Amp and supply the amplified left audio signal for Bi-Amp the first speaker terminal and causing the second amplification section to amplify the right audio signal for Bi-Amp and supply the amplified right audio signal for Bi-Amp to the second speaker terminal when the Bi-Amp function is used.06-16-2011
20090245540AMPLIFICATION CIRCUIT AND METHOD THEREFOR - In one embodiment, an amplification circuit receives an analog signal and adds another signal to the analog signal to modify the minimum amplitude of the analog input signal.10-01-2009
20120140957APPARATUS, SYSTEMS AND METHODS FOR CONTROLLING AN ELECTRONIC DEVICE USING AN ACCESSSORY - A system for controlling an electronic device, including an accessory coupled to the device having a control interface for receiving at least one input and a tone generator, the accessory configured to, in response to an input, generate a corresponding control tone using the tone generator, and send the control tone and a calibration sequence to the device. The device is operable to receive the calibration sequence and control tone. The device includes a zero-crossing detector operable to determine at least one of the start or ending of each of the calibration sequence and the control tone and having a circuit operable to determine the periods of the calibration sequence and the control tone based on the zero-crossing detector output.06-07-2012
20100189284VIBRATION DEVICE AND ACOUSTIC SYSTEM - A vibration device according to the present invention includes: a diaphragm; a support system member that supports the diaphragm in a manner that allows the diaphragm to vibrate; a tubular voice coil bobbin attached to the diaphragm; a magnet which is disposed on at least one side among an inner circumferential surface side and an outer circumferential surface side of the voice coil bobbin, and which is polarized in a vibration direction of the diaphragm, and which forms a magnetic gap on a side that faces the voice coil bobbin; a voice coil which is attached to the voice coil bobbin so as to be disposed within the magnetic gap, and which vibrates the diaphragm and the voice coil bobbin in response to a driving force generated when an input electrical signal is inputted into the voice coil; and a magnetic material member which is attached to the voice coil bobbin so as to be disposed in a balancing position within the magnetic gap, and which is, when vibrating together with the voice coil bobbin, subjected to an action of a magnetic attractive force in a direction away from the balancing position.07-29-2010
20100260356BAND-SPLITTING TIME COMPENSATION SIGNAL PROCESSING DEVICE - A band-splitting time compensation signal processing device 10-14-2010
20100183170DOCK WITHOUT A POWER SOURCE FOR DIGITAL DEVICES - There is provided a dock without a power source for a portable digital device with at least one integrated speaker driver. The dock may include a platform for placement of the portable digital device; a protrusion located at the platform for connection of the portable digital device with the dock with the protrusion including a slot for egress of air from at least one hole in a casing of the portable digital device to the dock; and at least one primary chamber to receive air from the portable digital device with the at least one primary chamber having a vented port for the egress of air. Advantageously, sound from the at least one integrated speaker driver is amplified when the portable digital device is connected to the dock. The connection of the portable digital device with the dock may be securable. A horn may be included in an exterior facing opening of the vented port, as the horn advantageously improves aspects of sound such as, for example, sound directivity, radiation efficiency or both of the aforementioned.07-22-2010
20110110540SHELF - A shelf is equipped with an audio amplifier and at least one loudspeaker. The shelf can be integrated into the interior design as a shelf while providing multimedia use for audio playback, video output, and connection to a computer, as well as serve for the high-quality enjoyment of music and its functional application, using only one device.05-12-2011
20100220874INPUT SELECTOR - A first selector receives a second input signal and a second reference voltage, and selects either one. A first buffer receives the output signal of the first selector, and outputs the signal thus received to a terminal of the first resistor, and to a terminal of the third resistor. A second selector receives a first input signal and a third input signal, and selects either one. A fourth selector receives, as input signals, the output signal of an operational amplifier, a signal that corresponds to the output signal of the second selector, and a signal that corresponds to the second input signal, and selects one signal selected from among the signals thus received.09-02-2010
20100226513AUDIO CIRCUIT - An object is to provide an audio circuit in which flow of excessive current through a capacitive speaker and a drive circuit thereof can be prevented while degradation of sound quality of high-pitched tones is suppressed. The audio circuit for driving a capacitive speaker includes: a weighting circuit for performing weighting in conformity with frequency components of an audio signal; and a signal-voltage limiting compression circuit for compressing a signal, which is input to the drive amplifier or which has been output from the drive circuit, at a prescribed compression ratio in accordance with a difference voltage between the output signal of the weighting circuit and a preset threshold voltage when the weighted signal exceeds the threshold voltage. Alternatively, the audio circuit is provided with a signal-voltage limiting compression circuit for passing, with amplitudes unchanged, signal components below a prescribed frequency contained in the signal reproduced by the capacitive speaker and compressing amplitudes of signal components not less than the prescribed frequency at a prescribed compression ratio.09-09-2010
20110058692AUDIO OUTPUT DEVICES - An audio output device is provided and includes a power source, a controller, a signal generating circuit, and a first amplifier. The power source provides a supply voltage signal. The controller receives the supply voltage signal. The controller further compares the supply voltage signal with a threshold voltage signal and generates a control signal according to the comparison result. The signal generating circuit generates a first analog signal. The first amplifier receives the first analog signal and generates a first amplified signal according to the control signal.03-10-2011
20100232628Circuits and Methods for Reducing Pop Noise in Class D Amplifiers - In one embodiment the present invention includes a method for starting up a class D amplifier. The method comprises increasing, gating, and driving. The increasing includes increasing a duty cycle of a pulse train from a first duty cycle to a second duty cycle. The gating includes gating a signal based on the increasing of the duty cycle. The gating results in a gated signal. The driving includes driving an output signal from the gated signal to charge an output capacitor. The output capacitor is coupled to a speaker. The increasing of the duty cycle contributes to the charging of the output capacitor such that switching sounds detectable by the human ear are reduced.09-16-2010
20100254549AMPLIFIER CIRCUIT OF CAPACITOR MICROPHONE - In an amplifier circuit of a capacitor microphone, when a too high input signal from the capacitor microphone is inputted, the levels of output signals of the amplifier circuit are limited. A first feedback capacitor of an operational amplifier is formed using a changeable capacitance type MOS capacitor element, and has a characteristic of increasing the capacitance value CAf10-07-2010
20090074210Audio signal processing apparatus - An audio signal processing apparatus is provided. The audio signal processing apparatus comprises a clock generator, a processing module, an amplifying module and an output module. The clock generator is used for generating a clock signal. The processing module is coupled to the clock generator for processing the clock signal and generating a processing signal. The amplifying module is coupled to the processing module for amplifying the processing signal and generating an amplifying signal. The output module is coupled to the amplifying module for outputting the amplifying signal.03-19-2009
20080310654Circuit for processing sound signals - A circuit for processing sound signals includes an input amplifier for amplifying an input signal, wherein the amplified input signal is supplied to an output amplifier unchanged via a primary path configured as a bypass line and processed via one or several secondary paths configured as a circuit for processing the amplified input signal for amplifying and outputting the processed signal, wherein respective signal portions of the amplified input signal, which are supplied to the output amplifier via the primary path and the secondary path(s), can each be adjusted with an adjusting device, and wherein the secondary path includes a corresponding equalizing filter for filtering a corresponding frequency range with a dynamic circuit for optionally dynamically changing frequency, amplitude and phase depending on the signal and concurrent with a static control.12-18-2008
20110026739HIGH LEVEL CAPABLE AUDIO AMPLIFICATION CIRCUIT - The present invention relates to an audio amplification circuit with first and second signal channels which generate first and second digital audio signals with different signal amplifications from a common audio input signal and a method of amplifying a common audio input signal with different signal amplifications to provide first and second digital audio signals with different amplification. The audio amplification circuit is particularly well-adapted for cooperating with an external or integral audio signal controller configured for receipt and processing of the first and second digital audio signals.02-03-2011
20080292116MULTI-MODE AUDIO AMPLIFIERS - A multimode audio amplifier comprises: a mode controller adapted to provide a control signal; and at least one multimode module, wherein each of the multimode modules has a plurality of operating modes, wherein the operating modes are selected in accordance with the control signal, wherein changing the operating modes results in a measurable change in at least one characteristic of the multimode audio amplifier; wherein the characteristics of the multimode audio amplifier consist of signal to noise ratio (SNR); total harmonic distortion and noise (THD+N); input to output delay; power consumption; and efficiency.11-27-2008
20100310097APPARATUS AND METHOD FOR OUTPUTING AUDIO SIGNAL IN PORTABLE TERMINAL - An apparatus and a method for outputting an audio signal in a portable terminal are provided. The portable terminal for outputting an audio signal includes an ear jack, a modem, and an amplifier. The ear jack connects the portable terminal with one of an earphone and an external apparatus. The modem detects whether one of the earphone and the external apparatus is connected to the ear jack. When connection of the external apparatus is detected, the amplifier high power-amplifies the audio signal and outputs the same to the external apparatus according to a control of the modem.12-09-2010
20100322440AUDIO PROCESSING CIRCUIT AND PREAMPLIFIER CIRCUIT - An audio processing circuit is provided, receiving a microphone signal from a microphone to output a differential signal. A preamplifier receives the microphone signal to output a first preamplified voltage and a second preamplified voltage. A gain stage receives the first preamplified voltage and the second preamplified voltage to output the differential signal comprising a first differential output and a second differential output. In the preamplifier, a first operational amplifier is provided. A first voltage controlled current source is controlled by the output end of the first operational amplifier to provide a first current. A first transistor has a gate coupled to a ground voltage supply, a source coupled to the first voltage controlled current source for receiving the first current, and a drain coupled to a voltage ground. Likewise, a second voltage controlled current source and a second transistor are presented symmetrically to render the differential output.12-23-2010
20110110538POWER AMPLIFIER AND METHOD FOR RESTRAINING POWER OF IMPROVED POWER AMPLIFIER - The present invention is related to an improved power amplifier and a method for restraining power of the improved power amplifier. The improved power amplifier has an output power restraint unit, and the output power restraint unit is capable of restraining output power of the improved power amplifier when the output power is exceedingly large. A method for restraining power of a power amplifier, the method comprises the steps of: determining whether power of output powers signal are exceedingly large through a power signal transformation unit, if yes, adjusting two variable resistor of an input amplifier unit for adjusting the power of the power signals, and outputting the adjusted power signals for driving a load via output terminals of the power amplifier.05-12-2011
20110019843High Efficiency Audio Amplifier and Method thereof - A high efficiency audio amplifier is disclosed. The high efficiency audio amplifier includes an input end for receiving an input audio signal, an output end for outputting an output audio signal, a signal generator coupled to the input end for determining a frequency of an oscillating signal according to the distribution of the input audio signal and a reference voltage, and generating the oscillating signal accordingly, a waveform transformer coupled to the input end and the signal generator for comparing the input audio signal with the oscillating signal to generate a pulse width modulation (PWM) signal, a pre-drive circuit for generating a pre-drive signal according to the PWM signal, an output stage coupled to the pre-drive circuit for generating an output signal, and a filter coupled to the output stage for filtering the output signal to generate the output audio signal to the output end.01-27-2011
20110110537Light-Powered Loudspeaker System - A light-powered loudspeaker system including a solar power generator, a power storage device, a wireless signal receiver, a power amplifier and a speaker module is disclosed. The solar power generator is configured to receive a solar energy and convert the received solar energy into electricity energy. The power storage device is coupled to the solar power generator for storing the converted electricity energy. The wireless signal receiver is coupled to the power storage device, receives wireless audio signals and generates an output signal. The power amplifier is coupled to the power storage device and the wireless signal receiver, amplifies the output signal and generates an amplified audio signal. The speaker module is coupled to the power amplifier and produces voices according to the amplified audio signal.05-12-2011
20110129103ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a terminal, an amplifier, a speaker, a power supply circuit and a first controller. The terminal configured to input an audio signal from an external device. The amplifier configured to amplify the audio signal. The speaker configured to output sound corresponding to the audio signal which is amplified by the amplifier. The power supply circuit configured to supply power to the amplifier. The first controller configured to control the power supply circuit to continue the supply of the power, when the electronic apparatus is in a non-operative state.06-02-2011
20110129104ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a terminal, an amplifier, a speaker, a power supply circuit, a first switch and a first controller. The terminal configured to input an audio signal from an external device. The amplifier configured to amplify the audio signal which is input from the terminal. The speaker configured to output sound corresponding to the audio signal which is amplified by the amplifier. The power supply circuit connected to the amplifier. The first controller configured to control the power supply circuit in order to supply the power to the amplifier, when the electronic apparatus is in a non-operative state and the first switch is turned on.06-02-2011
20110116658FINE NATURAL FIBER AND SPEAKER DIAPHRAGM COATED WITH FINE NATURAL FIBER - Natural fiber is beaten with a biaxial kneading machine. The beaten natural fiber is processed finely with a bead mill so as to allow the processed natural fiber to have a BET specific surface area not smaller than 1 m05-19-2011
20130156230WAVEFORM SHAPING FOR AUDIO AMPLIFIERS - Techniques for applying waveform shaping to DC-to-DC level transitions in an audio amplifier. In an aspect, a waveform shaping block may utilize a non-linear shaping waveform such as a Gaussian waveform, raised-cosine waveform, root-raised cosine waveform, etc., to shape the transition between two DC levels in an audio amplifier output. The waveform shaping techniques may be utilized, e.g., during power-up or power-down of the amplifier, or in an impedance measurement mode, to reduce audio artifacts associated with the transition while minimizing overall transition time.06-20-2013
20130156231DIGITAL/ANALOGUE CONVERSION APPARATUS - A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter.06-20-2013
20100195849THERMOACOUSTIC DEVICE - An amplifier circuit for thermoacoustic device includes a peak hold circuit, an add-subtract circuit, and a power amplifier. The peak hold circuit is configured to accept an audio signal and output a peak hold signal. The add-subtract circuit is configured to accept the audio signal and the peak hold signal, and output a modulated signal after a comparison operation of the audio signal and the peak hold signal. The power amplifier is configured to accept the modulated signal, amplify the modulated signal, and output an amplified voltage signal.08-05-2010
20100054500AUDIO DEVICE AND AUDIO INPUT/OUTPUT METHOD - An audio device and an audio input/output method are described, which is coupled to an audio port, and includes a capacitor, a load, an output amplifying module, and an input amplifying module. The capacitor and the load are coupled to the audio port. The output amplifying module is operated at a first working voltage, for outputting a first audio signal to the audio port. A direct current (DC) level of the first audio signal is substantially zero volts. The input amplifying module is operated at a second working voltage, in order to receive a second audio signal from the audio port. When the audio port is in an output state, the output amplifying module is enabled and the input amplifying module is disabled, and when the audio port is in an input state, the input amplifying module is enabled and the output amplifying module is disabled.03-04-2010
20110176694Multi-port combiner for an audio amplifier - A multi-port combiner for an audio amplifier is configured with a plurality of series-parallel coupled connection ports to enable one or more speaker monitors coupled thereto to receive audio signals from a single output port of the amplifier. The multi-port combiner also includes a phantom load having an impedance that is equivalent to that of one of the speaker monitors. As such, the phantom load is selectively coupled to the connection ports to maintain the series-parallel configuration of the connection ports, so that the equivalent impedance of all the speaker monitors coupled to the multi-port combiner is maintained within an acceptable operating range established by the amplifier.07-21-2011
20110150245CAPACITIVE LOAD DRIVING AMPLIFIER - An electronic amplifier for driving a capacitive load may include first and second differential input terminals to receive an input signal, and first and second differential output terminals to provide a differential output signal. The amplifier may further include a first operational device having first and second differential inputs connected to the first and second differential input terminals, respectively, and an output connected to the first differential output terminal, and a second operational device having first and second differential inputs connected to the first and second differential input terminals, respectively, and an output connected to the second differential output terminal. The first and second operational devices may be operatively configured so that both the first and the second output terminals are at a same reference potential during periods in which a module of differential output signal amplitude decrease.06-23-2011
20110069849Portable Amplifier - A portable amplifier for use with electric guitars and other audio output sources. The amplifier comprises a housing, which houses components required for a portable amplifier, including a power source, at least one speaker and a male input plug that can be extended or retracted into the body of the housing. In one embodiment, the male input plug can be positioned in a plurality of orientations for insertion into musical instruments.03-24-2011
20110249832SPEAKER DEVICE - A speaker device includes: a casing having a cylindrical shape which opens at one end side; and a sounding body arranged at the other end side of the casing and driven based on an audio signal, wherein a sealed space is formed by the casing and a setting surface when the casing is set, which functions as a cabinet.10-13-2011
20110158436ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a speaker, a terminal, an amplifier, a power supply circuit, a setting module, a detection module, and a controller. The terminal is configured to input an audio signal from an external device. The amplifier is configured to amplify the audio signal, and to output audio from the speaker. The power supply circuit is configured to supply power to the amplifier. The setting module is configured to set data which indicates whether audio output from the speaker is to be enabled or disabled when the apparatus is in a non-operative state. The detection module is configured to detect a predetermined state of the apparatus. The controller is configured to control the power supply circuit, based on the data and the predetermined state, in order to supply the power to the amplifier when the apparatus is in the non-operative state.06-30-2011
20110150244Audio Signal Amplifier for Karaoke Player - A configurable amplifier circuit for a karaoke player is described. In one embodiment, a karaoke player includes: a DVD/CD reader port for coupling to a DVD/CD reader, a microphone input to receive audio signals from an external microphone, an MPEG decoder coupled to the DVD/CD reader port and the microphone input, the MPEG decoder having first and second output terminals, a processor coupled to the MPEG decoder, the processor to control the MPEG decoder, and a configurable amplifier coupled to the first and second output terminals, wherein a first audio signal originating from the first output terminal is selectively amplified by the configurable amplifier circuit in accordance with a second signal originating from the second output terminal.06-23-2011
20100014694Audio Amplifier - The embodiments described herein relate to amplifier circuits with power rails. The power rails are generated in response to an input signal, which will typically be an audio signal, and with a sufficient magnitude to power the amplifier and to generate an output signal corresponding to the input signal.01-21-2010
20110176693ELECTRONIC DEVICE AND INTEGRATED CIRCUIT COMPRISING A GAIN CONTROL MODULE AND METHOD THEREFOR - A method for controlling a gain applied to an audio signal. The method comprises applying a gain step to a gain setting at defined time intervals, and upon detection of at least one zero crossing point within the audio signal, applying the gain setting to a gain control signal for controlling the gain applied to the audio signal.07-21-2011
20080205672SEMICONDUCTOR INTEGRATED CIRCUIT AND AMPLIFIER FOR SUPPRESSING POP SOUND WHILE MINIMIZING VOLTAGE TRANSITION SETTLING TIME - A semiconductor integrated circuit includes a capacitor element which defines a prescribed decay time constant with one or more resistors, an MOS transistor connected to the capacitor element via its gate, and a constant current generating element which generates a constant current. The capacitor element is charged with the constant current so as to create a linearly changing voltage. The linearly changing voltage is applied to the gate so that the MOS transistor can accordingly output a smoothly changing current.08-28-2008
20110164766Ribbon loudspeaker module and amplifier therefore - A ribbon loudspeaker module includes a ribbon element of electrically conductive material and having a resistance of less than 1Ω and a magnetic system arranged to create a magnetic field about the ribbon element. A buffer amplifier having an input is arranged to receive a loudspeaker drive signal from an audio power amplifier and an output arranged to drive the ribbon element directly. The ribbon loudspeaker module is preferably a low frequency module, designed to handle audio signals below 5 kHz, and preferably in the range 20 Hz to 3 kHz or a part thereof. The ribbon element may have a resistance of less than 0.5Ω, less than 0.2Ω and even as little as 0.15Ω or less.07-07-2011
20110164765PRODUCT OR PACKAGING SYSTEM WITH INTEGRATED ELECTRONICS - The present invention is directed to products, product packaging, or product displays containing an electrical component (07-07-2011
20110164764DIAPHRAGM FOR SPEAKER, SPEAKER USING THE DIAPHRAGM, ELECTRONIC DEVICE USING THE SPEAKER, AND SPEAKER-MOUNTED DEVICE - A speaker diaphragm containing resin and carbonized bamboo material with a large degree of flexibility in setting physical properties, moisture-proof reliability and strength secured, superior appearance, and productivity and dimensional stability increased, which allows making characteristics and sound highly accurately, and designing with great originality.07-07-2011
20120121109Analog-to-digital Converting Method and Functional Device Using the Same - An analog-to-digital converting method for converting an analog signal to a digital signal is disclosed. The analog-to-digital converting method includes decomposing the analog signal into a major analog signal and a minor analog signal, converting the major analog signal to a major digital signal, determining to which of a plurality of default sections the minor analog signal belongs to generate a minor digital signal correspondingly, and combining the major digital signal and the minor digital signal to form the digital signal.05-17-2012
20100246859BIASING CIRCUIT FOR A MICROELECTROMECHANICAL ACOUSTIC TRANSDUCER AND RELATED BIASING METHOD - A biasing circuit for an acoustic transducer is provided with: a voltage-booster stage, which supplies, on a biasing terminal, a boosted voltage for biasing a first terminal of the acoustic transducer; and filtering elements, set between the biasing terminal and the acoustic transducer, for filtering disturbances on the boosted voltage. The biasing circuit is further provided with switches, which can be actuated so as to connect the first terminal to the biasing terminal of the voltage-booster stage, directly during a start-up step of the biasing circuit, and through the filtering elements at the end of the start-up step.09-30-2010
20110135116Method and Apparaus for Biasing an Amplifier - An apparatus and method for biasing each amplifier of an amplification stage provides that the voltage across each current sensing element of each amplifier of the amplification stage is measured. For each pair of voltage measurements taken, a sum and difference is calculated, where the sum is processed to determine minima peaks and the difference is averaged. A portion of the sum term and the average of the difference term are summed to yield the individual bias current conducted by a first amplifier of the amplification stage. The difference between a portion of the sum term and the average of the difference term is calculated to yield the individual bias current conducted by the second amplifier of the amplification stage. The bias current conducted by the first and second amplifiers may then be individually modified manually, or conversely, may be modified automatically based upon the bias current measurements taken.06-09-2011
20100158278Power Management Controller for Drivers - A driver controller comprising a state machine for controlling transitions between a plurality of states. An output switch for providing a low impedance path to ground during transition periods. An output stage for decoupling output signal from driver amplifier during the transition periods.06-24-2010
20100195848AUDIO PROCESSING APPARATUS - An audio processing apparatus comprising: channel determination section for determining which one of a combination of the first left audio signal and the first right audio signal and a combination of the second left audio signal and the second right audio signal is included in multichannel audio data; and switching section for causing the first amplification section to amplify the first left audio signal and supply the amplified first left audio signal to the first speaker terminal and causing the second amplification section to amplify the first right audio signal and supply the amplified first right audio signal to the second speaker terminal when the combination of the first left audio signal and the first right audio signal is determined to be included; and causing the first amplification section to amplify the second left audio signal and supply the amplified second left audio signal to the third speaker terminal and causing the second amplification section to amplify the second right audio signal and supply the amplified second right audio signal to the fourth speaker terminal when the combination of the second left audio signal and the second right audio signal is determined to be included.08-05-2010
20110188675ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a speaker, a terminal, an amplifier, a battery, a power supply circuit, and a controller. The terminal is configured to input an audio signal from an external device. The amplifier is configured to amplify the audio signal which is input from the terminal, and to output audio from the speaker. The power supply circuit is configured to supply power from the battery to the amplifier. The controller is configured to control the power supply circuit, based on a residual capacity of the battery and a preset battery level, in order to supply the power to the amplifier when the electronic apparatus is in a non-operative state.08-04-2011
20110216920SPEAKER DRIVE INTEGRATED CIRCUIT - A speaker drive integrated circuit of the present invention includes: a load connection status detecting circuit configured to cause a current to flow from an external power supply to one of output terminals when an output side of an amplifying circuit is set to a high impedance state and detect whether a load connection status is normal, open, or short based on a voltage generated at the output terminal; and a transmitting terminal through which a signal indicating a detection result by the load connection status detecting circuit is output to outside.09-08-2011
20120308051METHOD AND ARRANGEMENT FOR DRIVING A MICROPHONE - Disclosed is a differential microphone pre-amplifier circuit (12-06-2012
20120308050EFFICIENCY OPTIMIZER OF AN AUDIO POWER AMPLIFIER FOR CAR RADIO - The present invention concerns an audio amplifier circuit designed to provide an output signal to an audio transducer, said audio amplifier circuit comprising an audio power amplifier designed to receive an audio signal and designed to generate said output signal, a sensor designed to detect an audible sound having at least one noise component, to generate a detected signal. The audio amplifier circuit also includes a processing block configured to receive said detected signal at its input and to generate an off signal at its output, the latter being located at the input of said audio power amplifier. The processing block processes the detected signal according to said input signal to identify said noise component of said detected signal to generate a reference signal. The processing block generates the off signal when the value of said input signal is lower than the value of said reference signal.12-06-2012
20120148072APPARATUS AND METHOD FOR WIDENING AUDIO SIGNAL BAND - An audio signal band expanding apparatus (06-14-2012
20090110216Wireless acoustic speaker mount - A Wireless Acoustic SPeaker mount, or WASP, is disclosed that serves as both a wireless speaker adapter and a speaker mount. Some embodiments include a separate transmitter that obtains wired acoustic signals from an acoustic source and transmits them wirelessly to the WASP. WASP's can include a digital and/or analog wireless receiver, digital-to-analog converter, amplifier, and/or equalizer or other sound quality adjuster. WASP's can rest on a horizontal surface or be mounted to or embedded within a wall, ceiling, or other structure. Speakers can rest on or attach to a WASP or be mounted inside of a WASP. In various embodiments the horizontal and/or vertical positioning of the speaker is adjustable, WASP's can be used outdoors, WASP's can extend a wireless transmission range by relaying signals to other WASP's, and the transmitter and WASP's can send on/off and other command signals to each other.04-30-2009
20120039491 INERTIAL TYPE ACOUSTIC TRANSDUCER - The present invention is drawn to inertial type transducers and a system for reducing the complexity and difficulty of installing the transducers internal to a structure. The transducer is equipped with a wireless receiver for receiving both sound content signals and control signals, and an amplifier, along with a power supply. Because the amplifier is activated by the wireless receiver, there are no wires necessary to connect the transducer to the source of the sound content or control signals thereby vastly simplifying installation. Heat dissipation and height minimization are also addressed.02-16-2012
20110305354SYSTEMS AND METHODS FOR CONTROLLING HDA SYSTEM CAPABILITIES - Systems and methods for controlling the capabilities of an High Definition Audio (HDA) system, wherein the system determines whether an optional component such as a plug-in card is connected to the system and then configures itself in a baseline configuration if the optional component is not connected or configures itself in a different, alternative configuration if the optional component is connected. In one embodiment, a codec of the system includes a programmable processor configured to read configuration authorization information and also read configuration information from the optional component if it is connected to the system. The processor also controls the configuration of the HDA system and the operation of the codec based on the authorization and configuration information. The system can thereby provide different features and functionality using the same hardware.12-15-2011
20120177231INTERACTIVE PLAY SYSTEM - An interactive play system including a handheld device and an insertion device is provided. An interactive application program is embedded in the handheld device. The insertion device includes a dock, an amplifier, a speaker, and a slave circuit. The dock carries the handheld device. The speaker is coupled to the amplifier and used for playing a sound. The slave circuit is coupled to the amplifier. When the handheld device is placed in the dock of the insertion device and accordingly activates the interactive application program, the handheld device displays an interactive graphical user interface, and the slave circuit and the amplifier are coupled to the handheld device, so as to guide a user to set the insertion device. The handheld device controls various functions of the slave circuit.07-12-2012
20110110539SELF-OSCILLATING AUDIO AMPLIFIER AND METHOD FOR RESTRAINING THE IMPROVED SELF-OSCILLATING AUDIO AMPLIFIER - An improved self-oscillating audio amplifier and a method for restraining audio distortion of the self-oscillating audio amplifier are disclosed. The improved self-oscillating audio amplifier comprises a distortion restraint unit configured to detect whether modulated audio signals outputted from the self-oscillating audio amplifier is distorted and, if so, to restrain the distortion. The method for restraining audio distortion of the self-oscillating audio amplifier includes the following steps of: determining whether the modulated audio signals outputted from an audio amplifier positive output terminal is distorted by a first flip-flop set, and if yes, restraining the distortion of the modulated audio signals outputted from the audio amplifier positive output terminal; and outputting the modulated audio signals to drive a speaker by the audio amplifier positive output terminal and an audio amplifier negative output terminal.05-12-2011
20120045076ELECTRONIC CIRCUIT FOR DRIVING A SWITCHING AMPLIFIER - An electronic circuit is disclosed for driving a switching amplifier. The electronic circuit is configured for generating, when operating in a switch-on mode, a driving signal for driving the switching amplifier. The driving signal carries a plurality of pulses having: an pulse width increasing between contiguous pulses of the plurality of pulses according to a step value having modulus equal to two and odd values; a polarity alternating between the contiguous pulses.02-23-2012
20120155676IMPEDANCE MATCHING SPEAKER WIRE SYSTEM - An impedance matched connection is provided between a load and a power source that outputs signals within a predetermined frequency range. A coaxial line has a predetermined characteristic impedance, an inner conductor, an outer conductor, and an insulator between the conductors. Each conductor has a first end electrically connectable to output terminals of the power source. A compensation circuit has an adjustable impedance, a first terminal electrically connected to a second end of the inner conductor and to a first terminal of the load, and a second terminal electrically connected to a second end of the outer conductor and to a second terminal of the load. The compensation circuit is adjustable to attain, for a pulse having a rise time/fall time faster than the rise/fall times associated with the predetermined range of frequencies, a combined impedance and load that is substantially equal to the characteristic impedance of the coaxial line.06-21-2012
20120155675Microphone Amplifier - A microphone amplifier comprises an input terminal (E06-21-2012
20120207330AUDIO SIGNAL AMPLIFYING CIRCUIT - The present disclosure provides an audio signal amplifying circuit for an electronic device including a processing chip and a speaker. The audio signal amplifying circuit includes an amplifying circuit and an inverting circuit connected to the processing chip to get a first control signal and invert the first control signal to generate a second control signal. The first control signal and/or the second control signal are used to control the operation mode of the amplifying circuit to be in an amplifying mode or in a non-amplifying mode.08-16-2012
20110103619AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.05-05-2011
20100290646SWITCHING AMPLIFIER - An amplifier having at least one switch controlled by an output voltage of a hysteresis block, wherein the hysteresis block is adapted to receive an input voltage signal based on an integration of an error signal, a low threshold voltage and a high threshold voltage, and is arranged to change the output voltage from a first value to a second value when the input voltage signal is higher than the high threshold voltage and to change the output voltage from the second value to the first value when the input voltage signal is lower than the low threshold voltage, and wherein the low threshold voltage is equal to V11-18-2010
20100092009AUDIO OUTPUT DEVICE - An amplification circuit amplifies an input signal. A signal detecting circuit detects whether the input signal is in a signal present state or in a signal absent state. A period detecting circuit detects a signal present duration for which the signal detecting circuit detects that the input signal is in the signal present state. A time setting circuit sets a control waiting time, depending on the signal present duration detected by the period detecting circuit. A control circuit limits outputting of the amplification circuit after the control waiting time set by the time setting circuit has elapsed since the signal detecting circuit detected the signal absent state of the input signal.04-15-2010
20100092010METHOD AND ELECTRONIC DEVICE FOR DRIVING A CAPACITANCE ELECTRO-ACOUSTIC TRANSDUCER - An electronic device includes a capacitance electro-acoustic transducer and an audio driver. The audio driver is coupled to the capacitance electro-acoustic transducer. The audio driver includes a high-voltage amplifier for receiving an input audio signal and for transforming the input audio signal into an output audio signal to drive the capacitance electro-acoustic transducer, wherein an absolute voltage value of the input audio signal is smaller than an absolute voltage value of the output audio signal. The output bandwidth of the capacitance electro-acoustic transducer is controlled by the magnitude of the output current of the audio driver. The capacitance electro-acoustic transducer of the present invention can meet different bandwidth requirements and thus achieve saving power, which cannot be achieved by a traditional dynamic electro-acoustic transducer.04-15-2010
20100246858AMPLIFIER CIRCUIT - An amplifier circuit comprises differential amplification circuitry comprising an input stage having first and second differential inputs, and an output stage, having respective first and second amplifier components with first and second differential outputs. The first amplifier component of the output stage comprises a first power transistor operably coupled to the first differential output and driven by a first differential output of the input stage, and a third power transistor operably coupled to the first differential output of the amplifier circuit and driven by a second output of the input stage. The second amplifier component comprises a second power transistor operably coupled to the second differential output and driven by a second output of the input stage, and a fourth power transistor operably coupled to the second differential output and driven by the first output of the input stage. Each of the first and second power transistors of the first and second amplifier components is driven in a current mirror arrangement by the respective first and second output of the input stage.09-30-2010
20120128182Analog-to-Digital Converter and Analog-to-Digital Conversion Method - The invention provides an analog-to-digital converter. In one embodiment, the analog-to-digital converter receives a first audio signal from a microphone sensor, and receives a first channel selection signal and a clock signal, and comprises a toggle detection module, a first data processing module, a second data processing module, and a multiplexer. The toggle detection module detects whether the first channel selection signal is toggling between a logic low level and a logic high level to generate a control signal. The first data processing module processes the first channel selection signal to generate a second channel selection signal. The second data processing module converts the first audio signal from analog to digital to generate a second audio signal. If the control signal indicates that the first channel selection signal is toggling between the logic low level and the logic high level, the multiplexer outputs data bits of the second channel selection signal as an output signal of the analog-to-digital converter when the clock signal oscillates to the logic high level, and outputs data bits of the second audio signal as the output signal of the analog-to-digital converter when the clock signal oscillates to the logic low level.05-24-2012
20120128181Analog-to-Digital Converter, Sound Processing Device, and Method for Analog-to-Digital Conversion - The invention provides a sound processing device. In one embodiment, the sound processing device comprises a first microphone, a first analog-to-digital converter, a second microphone, and a second analog-to-digital converter. The first microphone detects a first sound pressure to generate a first analog audio signal. The first analog-to-digital converter converts the first analog audio signal to a first digital audio signal. The second microphone detects a second sound pressure to generate a second analog audio signal. The second analog-to-digital converter converts the second analog audio signal to a second digital audio signal, encodes a third digital audio signal according to the second digital audio signal, receives the first digital audio signal and a clock signal, outputs data bits of the third digital audio signal when the clock signal oscillates to a logic low level, and outputs data bits of the first digital audio signal when the clock signal oscillates to a logic high level.05-24-2012
20120134514AMPLIFIER AND AMPLIFIER CONTROL METHOD - Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.05-31-2012
20120170774AMPLIFIER CIRCUIT - An amplifier circuit for amplifying audio signal output by an audio source and outputting the amplified audio signal to a speaker is provided. The amplifier circuit includes a peripheral circuit and an amplifier chip including an amplifier, a first, a second, a third resistor, and a fourth resistor. The peripheral circuit includes a fifth and a sixth resistors. The first resistor is connected between a non-inverting input port and an output port of the amplifier, the second resistor is connected between an inverting input port and the output port of the amplifier, the third resistor is connected between the non-inverting input port and the fifth resistor, the fourth resistor is connected between the inverting port and the sixth resistor, the fifth and the sixth resistors are further respectively connected to an anode output port of the audio source and a cathode output port of the audio source.07-05-2012
20120170773AMPLIFIER WITH HIGH-FREQUENCY NOISE REMOVING FUNCTION, MICROPHONE MODULE, AND SENSOR MODULE - An amplifier 07-05-2012
20120177230SOUND MANAGEMENT DEVICE - A unitary sound management device including an analog amplification system (07-12-2012
20100027813SWITCHING AUDIO AMPLIFIER, DIGITAL SPEAKING DEVICE AND AUDIO AMPLIFICATION METHOD - A switching audio amplifier adapted in a digital speaking device for driving a speaker is provided. An audio amplification method implemented for the switching audio amplifier is also provided. In the switching audio amplifier, a comparison stage compares an audio input signal with a saw-tooth signal to generate a Pulse Width Modulation (PWM) signal. A driver stage buffers the PWM signal to drive the speaker. A detector detects amplitude of the input signal to generate a control signal, and a saw-tooth generator adjusts a transition rate of the saw-tooth signal based on the control signal.02-04-2010
20110096945Microphone unit with internal A/D converter - The present invention relates to a microphone assembly comprising a microphone assembly casing having a sound inlet port and a transducer for receiving acoustic waves through the sound inlet port. The transducer converts the received acoustic waves to analog audio signals. The assembly according to the present invention further comprises an electronic circuit positioned within the microphone assembly casing, said electronic circuit comprising a pre-amplifier and an analog-to-digital converter preferably in form of a sigma-delta modulator so as to convert amplified analog audio signals to digital audio signals.04-28-2011
20090060228Systems and Methods for Shadowing an HDA Codec - Systems and methods for “shadowing” a target codec to provide additional features that are not available in the target codec. In one embodiment, an audio amplification system includes a High Definition Audio (HDA) bus, and an HDA controller, a conventional HDA codec and a shadow HDA codec coupled to the HDA bus. The conventional codec receives audio data and commands from the HDA controller via the bus and processes them to generate an output audio signal. The shadow codec snoops the audio data and commands on the HDA bus that are targeted to the conventional codec. The shadow codec processes the snooped audio data and commands to generate a second audio output. The shadow codec does not communicate with the HDA controller and is transparent to the controller. The shadow codec does not request enumeration from the HDA controller and does not receive an address from the HDA controller.03-05-2009
20120263325Orientation-Responsive Acoustic Array Control - An audio device incorporates a plurality of acoustic drivers and employs them to form either a first acoustic interference array generating destructive interference in a first direction from the plurality of acoustic drivers or a second acoustic interference array generating destructive interference in a second direction from the plurality of acoustic drivers in response to the orientation of the casing of the audio device relative to the direction of the force of gravity.10-18-2012
20120263324Orientation-Responsive Acoustic Driver Selection - An audio device incorporates a first acoustic driver having a first direction of maximum acoustic radiation and a second acoustic driver having a second direction of maximum acoustic radiation, where the first and second directions of maximum acoustic radiation are not in parallel, and where the audio device employs the first acoustic driver or the second acoustic driver in acoustically outputting a sound of a predetermined range of frequencies in response to the orientation of the casing of the audio device relative to the direction of the force of gravity.10-18-2012
20120263323AUDIO SIGNAL DRIVER FOR FLAT SOUND GENERATOR - An audio driver for a flat sound generator is coupled to the sound generator. The audio driver includes a power amplifier and an audio-amplifying transformer, the power amplifier receiving an input audio signal and the audio-amplifying transformer transforms the input audio signal into an output audio signal to drive a flat sound generator. The flat sound generator includes a perforated electrode plate and a diaphragm. Wherein, the audio-amplifying transformer and the flat sound generator form a low-pass filter effectively.10-18-2012
20120257771HIGH-EFFICIENCY LOW-VOLTAGE-POWER-SUPPLY HIGH-POWER-OUTPUT AUDIO DRIVER ARCHITECTURE - The present invention discloses a high-efficiency low-voltage-power-supply high-power-output audio driver architecture, including: a multi-coil loudspeaker; and a single-input N-output audio power amplifier configured to amplify a received digital audio signal and to output N switch signals for driving the multi-coil loudspeaker, wherein N represents the number of output channels and is a positive integer greater than or equal to 2. By implementing the above mentioned method, the requirement of the high power output under low voltage input is met; the solution improves the output power by means of combination of coils, and, in cooperation with the unique dynamic power allocation technology, the solution achieves the power balance of the multiple coils, so that the output efficiency of the audio driver is greatly improved.10-11-2012
20090016549POWER SUPPLY FOR LIMITED POWER SOURCES AND AUDIO AMPLIFIER USING POWER SUPPLY - A power supply for limited power sources and an audio amplifier using the power supply comprising power sources to provide an output power signal that can be used by load with a high peak to average power requirement ratio. When such power sources are used to power devices that have a high peak to average power consumption, the average power output of the device is severely limited if the peak power is kept below the power supply limits of the limited power source.01-15-2009
20120230517ELECTRONIC DEVICE - An electronic device is provided, including a conductive substrate, an electret diaphragm, a plurality of spacers, a first electrode, and two second electrodes. The conductive substrate has a plurality of openings. The spacers are disposed between the conductive substrate and the electret diaphragm to define an acoustic projecting portion and two acoustic receiving portions on the electret diaphragm. The first electrode is disposed on the acoustic projecting portion and coupled with the conductive substrate for generating an acoustic signal. The second electrodes are disposed on the acoustic receiving portions and coupled with the conductive substrate, wherein the acoustic receiving portions receive the acoustic signal and vibrate to vary an electrical field between the second electrodes and the conductive substrate.09-13-2012
20110123048CLASS G AUDIO AMPLIFIERS AND ASSOCIATED METHODS OF OPERATION - The present technology is directed to class G audio amplifiers and the associated methods of operation. In one embodiment, a class G audio amplifier includes an input port, an audio output stage, a level detector, and a charge pump. The class G audio amplifier regulates the power supplies of the audio output stage according to the input signal, so as to realize high efficiency and high quality audio output.05-26-2011
20120230518APPARATUS AND METHOD FOR AMPLIFICATION OF AUDIO CONTENT - There is provided an apparatus and method for amplification of audio content. The apparatus includes a first power line connectable to a first connector of the plurality of data output connectors; a second power line connectable to a second connector of the plurality of data output connectors; an amplifier connected along each of the first and the second power lines; and a coil driver coupled to each of the amplifiers, the coil drivers being arranged such that magnetic summation occurs when the coil drivers are energized. The method also enables magnetic summation to occur when the coil drivers are energized.09-13-2012
20080298608Sound Generating Device with Removable Memory - A sound generating device for transforming an object into a loudspeaker is includes an exciter module adapted for receiving audio signals stored on a portable micro-memory card or the like and a mounting device connected to the exciter module for removably connecting the exciter module to an object such that the object is transformed into a loudspeaker when the exciter module is energized by the audio signals.12-04-2008
20120269365ACOUSTIC APPARATUS, ACOUSTIC SYSTEM, AND AUDIO SIGNAL CONTROL METHOD - An acoustic apparatus includes: a first amplification unit; and an audio signal control unit that controls an audio signal input to the first amplification unit, wherein if a second amplification unit is connected to an output of the first amplification unit, a level control of the audio signal by the audio signal control unit is terminated.10-25-2012
20100246857ELECTRONIC DEVICE - Provided is an electronic device which can prevent operation stop attributed to lowering of an electronic device operation voltage. A pre-stage of a power amplifier (09-30-2010
20120128180Analog-to-Digital Converter and Analog-to-Digital Conversion Method - The invention provides an analog-to-digital converter. In one embodiment, the analog-to-digital converter receives a first audio signal from a microphone, and comprises a coding selection module, a pre-amplifier, a 05-24-2012
20120321106CONDENSER MICROPHONE - A condenser microphone includes: a true condenser microphone (TCM) pickup operable to generate an input signal at a high impedance corresponding to sound picked up thereby; an impedance conversion circuit connected electrically to the TCM pickup, and operable to convert the input signal from the TCM pickup to a converted signal at a low impedance; an amplifier circuit connected electrically to the impedance conversion circuit, disposed to receive a power signal, and operable for amplifying the converted signal so as to generate an output signal; and a phantom voltage module connected electrically to the TCM pickup, disposed to receive the power signal, and operable for generating a phantom signal from the power signal, the phantom signal having a voltage higher than that of the power signal and being provided to the TCM pickup for charging the TCM pickup.12-20-2012
20120087518Full Range Planar Magnetic Microphone and Arrays Thereof - Contemplated planar magnetic microphones have a magnet and diaphragm arrangement such that substantially homogenous vertical and high horizontal magnetic flux density is realized in the inter-magnet space. Most preferably, the diaphragm is disposed in the inter-magnet space and includes a voice coil covering a significant fraction of the active portion of the membrane. In further especially preferred aspects, the membrane is sufficiently strong and tensioned to allow a large elastic excursion in the inter-magnet space. Consequently, contemplated planar magnetic microphones provide exceptionally large dynamic range without compression and/or distortion and can be easily configured to operate in an environment that is subject to moisture, rain, or to even operate in a submerged environment. Moreover, contemplated microphones can be used as speakers at even high SPL without reconfiguration.04-12-2012
20110158437AUDIO AMPLIFIER HAVING LOAD ADJUSTMENT AND METHOD FOR THE LOAD ADJUSTMENT OF THE AUDIO AMPLIFIER - The invention relates to an audio amplifier (06-30-2011
20110158435AUDIO SIGNAL AMPLIFIER CIRCUIT - An inverting amplifier which drives headphones via an output capacitor includes: an operational amplifier, an input resistor having a first terminal via which an audio signal to be amplified is received, and a second terminal connected to an inverting input terminal of the operational amplifier; and a feedback resistor having a first terminal connected to an inverting input terminal of the operational amplifier, and a second terminal connected to the output terminal. A reference voltage source generates a bias voltage Vb, and supplies it to the non-inverting input terminal. A discharging path includes a discharging resistor and a first switch arranged in series between an output terminal of the reference voltage source and an fixed voltage terminal. A second switch is arranged between the output terminal of the operational amplifier and a node on the discharging path where the electric potential is higher than it is at the discharging resistor.06-30-2011
20130022219VOICE COIL SPEAKER - There is provided a voice coil speaker containing a bobbin having multilayer voice coils formed thereon in which the bobbin and a circuit board are properly arranged. In a voice coil speaker equipped with a bobbin having multilayer voice coils formed thereon and a diaphragm connected to the bobbin, the bobbin and the diaphragm being provided in a speaker body, an audio signal processing circuit board for processing an audio signal is disposed ahead of the diaphragm, and plural output terminals for outputting to the multilayer voice coils are arranged in the peripheral direction of the audio signal processing circuit board.01-24-2013
20080232614SOUND AMPLIFIER WITH SPEAKER - An instrument amplifier includes an amplifier circuit for amplifying a sound signal input from an electric guitar. A main speaker emits sound according to the sound signal being amplified. A CD player plays back an audio signal from an audio CD. Side speakers for playback emits audio sound according to the audio signal being played back. A speaker box contains the main speaker and the side speakers in one space. In one embodiment, the speaker box includes a rear panel for closing a space behind the main speaker and the side speakers. Furthermore, an output mode key is settable in a first mode by external operation, the first mode being for controlling the playback speaker to emit sound according to the sound signal. The side speakers are disposed beside one another, for stereo sound emission of the audio sound.09-25-2008
20080226100Microphone Amplification Arrangement and Integrated Circuit Therefor - A microphone amplifier arrangement comprises at least one microphone input connected to a dual output microphone pre-amplifier having an input resistance comprising a first resistance and a second resistance in a first voltage-to-voltage mode of operation, and only the second resistance in a second current-to-voltage mode of operation. A first output is operably coupled to a first feedback path comprising a V2V feedback resistor; and a second output is operably coupled to a second feedback path comprising an I2V feedback resistor. In this manner, the microphone amplifier arrangement is arranged to support both a V2V microphone amplifier and a low-noise I2V microphone amplifier.09-18-2008
20130177175POWER EFFICIENCY IMPROVEMENT OF AN AUDIO AMPLIFIER BY ADAPTIVE CONTROL OF A CHARGE PUMP - A control circuit and method for an audio amplifier detect a signal for driving a speaker to control the switching frequency and the operation mode of a charge pump in the audio amplifier, to improve power efficiency of the audio amplifier. Preferably, a digital interface is further used to test the magnitude of the output signal of the audio amplifier, to reduce the costs of analog test. The charge pump has fewer switches and thus saves costs and die area of an integrated circuit. The control method needs only two phase control for the charge pump to generate a positive voltage and a negative voltage, and thus simplifies the operation of the circuit.07-11-2013
20110274295NEGATIVE-VOLTAGE CHARGE PUMP CIRCUIT - A control unit alternately repeats a first state in which a first switch and a third switch are on and a second state in which a second switch and a fourth switch are on. A voltage detection unit compares the output voltage that occurs at one terminal (OUT terminal) of an output capacitor with a negative threshold voltage, and generates an abnormality detection signal which is asserted when the output voltage is higher than the threshold voltage Vt. When the abnormality detection signal is asserted, the control unit switches the on resistance of the first switch to a value that is higher than that in a normal state.11-10-2011
20080219479Audio Output Circuit and Audio Output Method - An audio output circuit including an input-signal generation block generating an input signal obtained by integrating a cyclic waveform and inputting the input signal to an audio amplifier at a transition from a normal operation to a power down state or at a return from the power down state to the normal operation, wherein an amplifier output terminal of the audio amplifier and an audio output unit are coupled via a capacitor.09-11-2008
20130094673METHOD AND APPARATUS FOR OUTPUTTING AUDIO SIGNAL - An apparatus for outputting an audio signal with improved sound quality is provided. The apparatus includes a modulation and amplification unit for pulse modulation and switching amplification of an input audio signal and generating an amplified signal which corresponds to the input audio signal; and a vacuum tube amplification unit for inputting a vacuum tube signal generated by attenuating the amplified signal and adding harmonics of a vacuum tube to the amplified signal, to the modulation and amplification unit to provide a mellow sound.04-18-2013
20110243352Concept, method and apparatus of improved distortion switched-mode amplifier - Systems and methods for switched-mode amplifiers having improved harmonic distortion are disclosed. High order in-band filtering is enabled without undue trade-off of distortion due to intermodulation/aliasing. A pre-modulation block is introduced, deployed between a loop filter block and a pulse-width modulation block, performing uniform pulse-width modulation. The pre-modulation block attenuates/removes amplitude dependent high frequency ripples before pulse-width modulation. The pre-modulation block in conjunction with the pulse-width modulation block performs double sampling of the input signals.10-06-2011
20110235827AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.09-29-2011
20100316234PROJECTOR AND AUDIO OUTPUT METHOD - A projector includes: a first audio input section adapted to input a first sound signal; a second audio input section adapted to input a second sound signal; a first sound amplifier section adapted to amplify the first sound signal received through the second audio input section to generate a first amplified signal; a second sound amplifier section adapted to amplify the second sound signal received through the second audio input section to generate a second amplified signal; a first audio output section adapted to output a first sound based on the first amplified signal; a second audio output section adapted to output a second sound based on the second amplified signal; and a determination section adapted to determine whether or not the first sound signal is being input.12-16-2010
20110305353AUDIO AMPLIFIER WITH CLOSED-LOOP POWER - The present technology relates generally to a closed-loop power stage and audio amplifier circuits comprising the same. The present technology further provides a method for controlling an amplifier circuit. The closed-loop power stage is configured to receive a PWM input signal having a first frequency and a first duty cycle, a power supply voltage, and a bias signal related to the power supply voltage, and to output a square-wave signal having a second frequency and a second duty cycle. The closed-loop power stage comprises a feedback loop which is configured to regulate the second duty cycle of the square-wave signal in response to a variation in the power supply voltage. The audio amplifier circuit comprising the closed-loop power stage may have a stable output voltage and thus have good power supply rejection performance.12-15-2011
20110311076Method for adjusting the maximum output power of a valve power amplifier stage for an audio amplifier, and corresponding valve power amplifier stage - A valve power amplifier stage for an audio amplifier, which amplifier stage has at least one thermionic valve and a polarization circuit for polarizing the anode, the cathode and the control grid of the thermionic valve so as to determine the maximum output power. The polarization circuit comprises an adjusting module for adjusting the feed voltage of the anode and the polarization voltage of the control grid so as to adjust the maximum output power of the thermionic valve, and a potentiometer coupled with the adjusting module for allowing a user to control the adjusting means so as to select the desired maximum output power from a plurality of predetermined output power values.12-22-2011
20130195289POWER AMPLIFYING APPARATUS AND AUDIO SYSTEM - The power amplifying apparatus includes a first comparator that compares the first detection signal and the fourth detection signal and outputs a first comparison signal depending on whether or not a difference between the first current and the fourth current is equal to or greater than a first predetermined value. The power amplifying apparatus includes a second comparator that compares the second detection signal and the third detection signal and outputs a second comparison signal depending on whether or not a difference between the second current and the third current is equal to or greater than a second predetermined value.08-01-2013
20120076326ALL-IN-ONE COMPUTER AUDIO SYSTEM - An all-in-one audio system includes an audio chip, an audio interface, first and second audio signal amplifiers, a speaker, a woofer, a multi-function controller, a high definition multimedia interface (HDMI), and a switch. The multi-function controller is connected to the audio chip, the switch, the audio interface, the first and second audio signal amplifiers, and the HDMI. When the multi-function controller detects a high definition multimedia signal through the HDMI, the multi-function controller turns off the switch, decodes the high definition multimedia signal into an audio signal, and transmits the audio signal to the audio interface, and the first and second audio signal amplifiers. The first and second audio signal amplifiers amplify the audio signal and output the amplified audio signal to the speaker and woofer.03-29-2012
20130208922Integrated Amplifier for Driving Acoustic Transducers - The invention relates to an electronic integrated amplifier for driving an acoustic transducer. The amplifier comprises two differential input terminals to receive an input signal and a first and a second output terminal to provide an output signal to the transducer. In addition, the amplifier comprises an operational amplifier having an input end including differential inputs and an output end operatively associated with the first and second output terminals. A pair of input resistors connect the two differential input terminals to two intermediate terminals, respectively. A pair of feedback resistors connect the first and second output terminals to the two intermediate terminals, respectively. The integrated amplifier also comprises means for high-pass filtering the input signal. Such filtering means is characterized in that it comprises an input element interposed between said intermediate terminals and the input end of the operational amplifier, and a feedback element connected between the input end and the output end of the same operational amplifier.08-15-2013

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