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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
381113000 With electrostatic microphone 17
381116000 With electrostatic loudspeaker 6
381114000 With piezoelectric microphone 5
20120224723Condenser Microphone - A condenser microphone includes a condenser microphone unit and a piezoelectric element. The piezoelectric element is disposed so as to generate piezoelectric signals in response to vibration causing the unit to generate vibratory noise signals. The piezoelectric signals are inputted through a low-pass filter and a level adjuster circuit to the unit to drive a diaphragm of the unit. The vibratory noise signals generated by the vibration in the unit are canceled with the piezoelectric signals generated by the piezoelectric element.09-06-2012
20100254547PIEZOELECTRIC MEMS MICROPHONE - A piezoelectric MEMS microphone comprising a multi-layer sensor that includes at least one piezoelectric layer between two electrode layers, with the sensor being dimensioned such that it provides a near maximized ratio of output energy to sensor area, as determined by an optimization parameter that accounts for input pressure, bandwidth, and characteristics of the piezoelectric and electrode materials. The sensor can be formed from single or stacked cantilevered beams separated from each other by a small gap, or can be a stress-relieved diaphragm that is formed by deposition onto a silicon substrate, with the diaphragm then being stress relieved by substantial detachment of the diaphragm from the substrate, and then followed by reattachment of the now stress relieved diaphragm.10-07-2010
20080285776AUDIO INTERFACE DEVICE AND METHOD - The invention provides an audio interface device and method to acquire audio signal from either an analog or digital microphone through a common connector. The audio interface comprises a connector, electrically connected with a microphone plugged thereinto, an analog readout circuit, acquiring an analog audio signal from an analog microphone, a digital readout circuit, acquiring a digital audio signal from a digital microphone, and a decision circuit, selectively connecting the analog or digital readout circuit to the connector to acquire the analog or digital audio signal respectively according to whether the microphone plugged into the connector is analog or digital.11-20-2008
20110182443ELECTRONIC DEVICE HAVING A CONTACT MICROPHONE - Embodiments of the present invention disclose a contact microphone for an electronic device. According to one embodiment, the electronic device includes a display lens having a front side and a backside opposite the front side, with the display lens being formed around the perimeter of a display unit. Furthermore, a contact microphone is coupled to a backside of the display lens and configured to convert acoustic signals received on the front side of the display lens.07-28-2011
20120213388Unidirectional Mechanical Amplification in a Microphone - A unidirectional active microphone that includes a diaphragm, coil, and piezoelectric component. An electrical circuit provides amplification to the coil. The piezoelectric component produces unidirectional coupling between coil and diaphragm. The microphone is unidirectional in that the amplification is provided solely to the coil and is not transferred to the diaphragm.08-23-2012
381117000 With magnetic loudspeaker 4
20090123005MULTIPLE MAGNET LOUDSPEAKER - A loudspeaker provides increased magnetic flux from multiple magnets to drive voice coils to generate sound. The loudspeaker is formed as a smaller profile and reduced weight package. The loudspeaker includes a dual pole, first and second magnets, first and second front plates, and first and second gaps. The polarities of the first and second magnets are aligned in the same direction. The first and second magnets may be disk or ring-shaped and may be coupled to a flange of the dual pole. The first and second gaps may be formed between the inner diameters of the first and second magnets and the dual pole. The magnetic flux produced by the first and second magnets may be combined, directed, and concentrated within the first and second gaps by the dual pole and the front plates. At least portions of a first and a second voice coil may be positioned within the first and second gaps, respectively, and diaphragms may be coupled to the first and second voice coils.05-14-2009
20080212800Diaphragm for Speaker, Method for Producing Same, Speaker Using Such Diaphragm, and Apparatus Using Such Speaker - A diaphragm for a loudspeaker contains resin, aramid fibers, and an organic silicon compound binding the resin with the aramid fibers. By this structure, high elasticity and high internal loss as characteristics of the aramid fibers are maintained; flexibility in the setting of properties of the diaphragm is thus increased. Accordingly, a diaphragm securing humidity resistance reliability and strength, and having a superior appearance can be provided.09-04-2008
20110064247Automated Customization of Loudspeakers - A loudspeaker includes a horn including a first end panel, a second end panel, a first side panel, and a second side panel. Edges of at least the first and second side panels define a diffraction slot opening. The first and second side panels are each fabricated from a sheet of flexible material held in a stressed, curved shape by at least a rigid support member. The panels are designed by an automated process based on a number of electro-acoustic transducers to be used in a loudspeaker, horizontal and vertical coverage angles for the loudspeaker, and a wall length for a horn of the loudspeaker.03-17-2011
20120087517SPEAKER UNIT AND ACTIVE SPEAKER DEVICE - A speaker unit performing sound output in proportion to electric current by current driving includes: a frame having an opening; a magnet arranged inside the frame and formed in an annular shape; a yoke including a shaft-shaped insertion arrangement portion which is inserted into a center of the magnet; a coil bobbin formed in a cylindrical shape; a coil wound around an outer peripheral surface of the coil bobbin; a damper having elasticity and connected between the frame and the coil bobbin; a cone connected to the coil bobbin at an inner peripheral portion and fixed to an opening edge of the opening of the frame at an outer peripheral portion, which vibrates with movement of the coil bobbin; and a sound absorbing material arranged inside the coil bobbin.04-12-2012
381115000 With magnetic microphone 1
20130170669STRAIN AND PRESSURE SENSING DEVICE, MICROPHONE, METHOD FOR MANUFACTURING STRAIN AND PRESSURE SENSING DEVICE, AND METHOD FOR MANUFACTURING MICROPHONE - According to one embodiment, a strain and pressure sensing device includes a semiconductor circuit unit and a sensing unit. The semiconductor circuit unit includes a semiconductor substrate and a transistor. The transistor is provided on a semiconductor substrate. The sensing unit is provided on the semiconductor circuit unit, and has space and non-space portions. The non-space portion is juxtaposed with the space portion. The sensing unit further includes a movable beam, a strain sensing element unit, and first and second buried interconnects. The movable beam has fixed and movable portions, and includes first and second interconnect layers. The fixed portion is fixed to the non-space portion. The movable portion is separated from the transistor and extends from the fixed portion into the space portion. The strain sensing element unit is fixed to the movable portion. The first and second buried interconnects are provided in the non-space portion.07-04-2013
20130044898Sensitivity Adjustment Apparatus And Method For MEMS Devices - A microelectromechanical (MEMS) microphone includes a MEMS motor and a gain adjustment apparatus. The MEMS motor includes at least a diaphragm and a charge plate and is configured to receive sound energy and transform the sound energy into an electrical signal. The gain adjustment apparatus has an input and an output and is coupled to the MEMS motor. The gain adjustment apparatus is configured to receive the electrical signal from the MEMS motor at the input and adjust the gain of the electrical signal as measured from the output of the gain adjustment apparatus. The amount of gain is selected so as to obtain a favorable sensitivity for the microphone.02-21-2013
20110176692CAPACITOR MICROPHONE - There is provided a capacitor microphone comprising a capacitor transducer (KW), a high frequency bridge (HFB) coupled to the capacitor transducer (KW), a high frequency coil (HFS) coupled to the high frequency bridge (HFB), an HF transformer (HFT), a synchronous demodulator (SD), a low frequency output (NFA) and a high frequency stabiliser unit (SE). The high frequency stabiliser unit (SE) is coupled between the synchronous demodulator (SD) and the low frequency output (NFA) and serves to stabilise the HF voltage.07-21-2011
20120163633REMOTE CONTROL EARPHONE AND ELECTRONIC DEVICE USING THE SAME - The present disclosure provides an electronic device with a remote control earphone electrically connected to the main body of the device. The remote control earphone includes seven sensing units, which are substantially arranged in a “8” shape. Sensing signal generated by each sensing unit in response to a touch from the user includes an identification code for identifying itself. The remote control earphone transmits the generated sensing signal to the main body. The main body includes a cache unit to store at least one identification code corresponding to the sensing signal, a storage unit to store the relationship between the identification codes and numbers the identification codes corresponding to, and a processing unit to determine which one of the numbers is input according to the at least one identification code and the relationship.06-28-2012
20080260181Reducing acoustic coupling to microphone on printed circuit board - A mobile computing device comprises a printed circuit board, a processing circuit, a surface mount microphone, and a vibration attenuation portion. The processing circuit is disposed on a first portion of the printed circuit board. The surface mount microphone is disposed on a second portion of the printed circuit board. The vibration attenuation portion of the board is configured to attenuate vibrations from the first to the second portion of the printed circuit board.10-23-2008
20100158277READ-OUT CIRCUIT WITH HIGH INPUT IMPEDANCE - Provided is a read-out circuit that is connected to a microphone and configured to linearly amplify a current signal generated by the microphone and output the amplified current signal. The read-out circuit includes an amplification unit and a feedback resistor. The amplification unit has an amplification gain between 0 and 1. The feedback resistor is connected between input and output terminals of the amplification unit. As the amplification gain of the amplification unit becomes closer to 1, an input impedance becomes higher. A preamp of the read-out circuit can have a high input impedance due to the amplification gain, and the read-out circuit can be manufactured using a CMOS process.06-24-2010
20120183156MICROPHONE SYSTEM WITH A HAND-HELD MICROPHONE - A microphone system is provided. The microphone system comprises at least one hand-held microphone and a base station. Audio signals detected by the hand-held microphone are forwarded to the base station. The hand-held microphone comprises a motion detection unit for detecting a motion or a gesture of a hand-held microphone. A control signal generating unit generates control signals based on the detected motion or gesture of the hand-held microphone. The hand-held microphone is adapted to forward the detected motion or gesture or the control signals to the base station. The output audio signal of the hand-held microphone can be manipulated based on the control signals. The hand-held microphone comprises an activation unit for activating or deactivating the motion detection unit or for activating or deactivating the transmission of the control signals.07-19-2012
20100329483CAPACITOR MICROPHONE - Diaphragms of a plurality of capacitor microphone units are arranged in the same plane and the capacitor microphone units are connected in series to make an output from an impedance converter connected to one capacitor microphone unit drives a ground side of another capacitor microphone unit connected to the impedance converter.12-30-2010
20130089222CONDENSER MICROPHONE - The present invention has: a condenser microphone unit which performs electroacoustic conversion according to a change in an electrostatic capacitance between a diaphragm and a fixed pole; a non-inverting amplifier which is connected to one of the diaphragm and the fixed pole, and which has an impedance converter which converts an output impedance of the microphone unit into a low impedance; an inverting amplifier which receives an input of an output signal of the non-inverting amplifier through an input resistance, and which has a feedback resistance; and a variable resistor which is connected between an output of the non-inverting amplifier and an output of the inverting amplifier, and in which a wiper is connected to the diaphragm or the fixed pole, whichever is not connected to the non-inverting amplifier, and the sensitivity changes according to the position of the wiper of the variable resistor.04-11-2013
20130051583High Voltage Multiplier For A Microphone And Method Of Manufacture - A microphone circuit includes a condenser microphone and a charge pump. The condenser microphone is configured to receive sound energy and responsively convert the sound energy into a microphone output voltage. The charge pump is implemented in a low voltage CMOS process. It is coupled to the microphone and is configured to supply a bias voltage to the microphone allowing the microphone to operate. By using a proper circuit topology, whose maximum output voltage is limited by the breakdown voltage between the NWELL and the substrate, and by blocking the formation of the PWELL around the NWELL at a predetermined distance so that the NWELL is surrounded by a very lightly doped substrate from all sides, the maximum output voltage of the charge pump is increased significantly.02-28-2013
20130051582System and Method for Low Distortion Capacitive Signal Source Amplifier - According to an embodiment, a method includes amplifying a signal provided by a capacitive signal source to form an amplified signal, detecting a peak voltage of the amplified signal, and adjusting a controllable impedance coupled to an output of the capacitive signal source in response to detecting the peak voltage. The controllable impedance is adjusted to a value inversely proportional to the detected peak voltage.02-28-2013
20130070940CIRCUIT AND APPARATUS FOR CONNECTING A MEMS MICROPHONE WITH A SINGLE LINE - A circuit electrically connects a MEMS microphone with a single line transmitting both a DC power signal and an AC information signal. The MEMS microphone has a power interface for receiving the power signal, and an information interface for delivering the information signal. In such embodiments, the circuit includes a pair of lines that separate the power and information signals. To that end, the circuit has an information line configured to connect with the information interface of the MEMS microphone, and a power line configured to connect with the power interface of the MEMS microphone.03-21-2013
20090092266Wireless audio system capable of receiving commands or voice input - A wireless audio system includes a host, a transmitter, and a receiver. The host includes a controller for controlling operations of the host, application software executed by the controller for producing audio signals, and a first electrical connector for connecting to a second electrical connector of the transmitter. The transmitter includes a first transceiver for wirelessly transmitting audio signals received from the host and for wirelessly transmitting and receiving data. The receiver includes a second transceiver for receiving audio signals wirelessly transmitted from the first transceiver of the transmitter, an audio output device for outputting the received audio signals, and a user interface for receiving a command from a user for controlling the host. The command is wirelessly transmitted from the receiver to the transmitter and delivered to the host, and the application software performs an action according to the command.04-09-2009
20120308047SELF-TUNING MEMS MICROPHONE - A self-tuning MEMS microphone. The microphone includes a capacitive sensor, an amplifier, a signal converter, a frequency generator, a micro-speaker, and a controller. The capacitive sensor is configured to detected a sound wave and output an electric signal based on the sound wave. The amplifier is coupled to the capacitive sensor, and configured to amplify the electric signal. The signal converter is coupled to the amplifier, and configured to adjust a frequency response of the amplified electric signal. The frequency generator is configured to output an AC electric signal. The micro-speaker is coupled to the frequency generator, and configured to convert the AC electric signal into a sound wave. The controller is coupled to the signal converter and the frequency generator. The controller is configured to direct the frequency generator to output the AC electric signal at a predetermined frequency and to detect an amplified electric signal generated by the capacitive sensor based on the AC electric signal.12-06-2012
20120224722METHOD FOR DRIVING A CONDENSER MICROPHONE - A method for driving a condenser microphone is provided. The condenser microphone comprises a membrane and an electrode constituting a capacity. A polarization voltage is applied between the membrane and the electrode. According to the method, an electrical signal generated by the condenser microphone based on a received acoustic signal causing a deflection of the membrane is detected, and the polarization voltage is varied in response to the detected electrical signal.09-06-2012
20120237058Apparatus - An apparatus comprises a substantially horn shaped structure configured to amplify sound from a speaker of a device wherein the apparatus comprises packaging of the device.09-20-2012
20120177229PRINTED CIRCUIT BOARD WITH AN ACOUSTIC CHANNEL FOR A MICROPHONE - A printed circuit board with an acoustic channel for a microphone and a portable electronic device having such a printed circuit board are provided. In accordance with one embodiment, there is provided a microphone assembly, comprising: a printed circuit board (PCB) comprising a board body having at least one signal trace, the printed circuit board defining an acoustic channel within the board body which extends between a microphone aperture in the board body and a plurality of inlet openings in the board body.07-12-2012
20100266146Integrated Circuit Device, Voice Input Device and Information Processing System - An integrated circuit device includes a circuit board (10-21-2010
20100266145Apparatus, methods and computer programs for converting sound waves to electrical signals - An apparatus comprising: a first member including a plurality of portions separated from one another by electrical insulator material; a second member configured to form capacitors with the plurality of portions of the first member; and wherein one of the first member and the second member are configured to vibrate in response to sound waves, and a first portion of the plurality of portions is configured to provide a first output signal representative of the sound waves and a second portion of the plurality of portions is configured to provide a second output signal representative of the sound waves.10-21-2010
20090279716VIBRATION GENERATOR FOR ELECTRONIC DEVICE HAVING SPEAKER DRIVER AND COUNTERWEIGHT - A vibration generator for a portable electronic device includes a speaker driver and a counterweight retained by a housing to form a closed assembly. When a communications transmission is received by the electronic device, an input force signal is transmitted to the speaker driver to apply a force at a frequency substantially below its resonance frequency. Air sealed within the vibration generator between the speaker driver and the counterweight transmits the force signal inputted to the speaker driver to the counterweight with minimal dissipation, thereby causing the counterweight to vibrate at substantially the same frequency as that of the input force signal. The vibrations of the counterweight alert a user that a communications transmission is being received.11-12-2009
20110293115DYNAMICALLY BIASED AMPLIFIER - An amplifier including an input stage, an output stage, an adjustable bias current generator and a level detector. The input stage may receive and amplify or buffer an input signal. The input stage may be biased by a first bias current. The output stage may supply an output signal to an amplifier load. The output stage may be biased with a second bias current. The adjustable bias current generator may be operatively coupled to the input stage and the output stage to supply these with the first and second bias currents, respectively. The level detector may be operatively coupled to the input signal and the adjustable bias current generator to control the first and second bias currents depending upon the input signal. The adjustable bias current generator may adjust the respective levels of first and second bias currents in opposite directions. Disclosed is an electroacoustical transducer incorporating the amplifier.12-01-2011
20090154729Filter Circuit for an Electret Microphone - A miniature electret microphone includes an input buffer circuit. The input buffer circuit includes an integrated circuit including a floating ground substrate and a p-n junction. The p-n junction is coupled as a capacitor to a filter circuit of the input buffer circuit06-18-2009
20100119083COMPENSATION FOR NONUNIFORM DELAYED GROUP COMMUNICATIONS - A method for synchronizing audio reproduction in collocated end devices is presented. Each of the devices auto-correlates using noise to determine a threshold prior to the antenna receiving an audio signal. When the devices receive a common audio signal, they provide audio outputs. Each device cross-correlates its audio output with the audio outputs of the other devices. The timing of the audio output of each device is then adjusted such that the audio outputs of all of the devices align temporally with the lagging or leading device.05-13-2010
20120033832MICROPHONE AND ACCELEROMETER - The invention relates to a method for manufacturing a micromachined microphone and an accelerometer from a wafer 02-09-2012
20100158276DIGITAL MICROPHONE - A digital microphone is provided, comprising a transducer for converting sound pressure into an analog electrical signal, an analog-to-digital converter for converting the analog electrical signal into a digital signal according to a clock signal, and a clock buffer circuit coupled between the analog-to-digital converter and a clock source for deducting a high frequency component from the clock signal received from the clock source.06-24-2010
20100080404DRIVE UNIT MANUFACTURING METHOD AND DRIVE UNIT - The present invention provides a drive unit manufacturing method including the steps of: preparing a conducting wire which contains at least copper and forms a voice coil for conversion between sound and electric signals and arranging the conducting wire on a land which is formed on a board that the voice coil is arranged on and is provided for transmitting the electric signals; and connecting the conducting wire and the land by resistance welding.04-01-2010
20110170714FAST PRECISION CHARGE PUMP - The present invention relates to a condenser microphone assembly comprising a capacitive electro-acoustic transducer element comprising a diaphragm and a back-plate operatively connected to a DC bias voltage, a fast charge pump adapted to generate the DC bias voltage, and a controllable or programmable current source operatively connected to the DC bias voltage to draw a predetermined DC current there from. The controllable or programmable current source is responsive to a difference between a representative of a detected DC bias voltage and a DC reference voltage.07-14-2011
20090296962Impulse Response Processing Apparatus and Reverberation Imparting Apparatus - An impulse response processing apparatus is composed of a waveform divider, a time adjuster, an interpolation processor and a waveform synthesizer. The waveform divider divides an impulse response into a plurality of base blocks on a time axis. The time adjuster increases a time difference between two adjacent ones of the plurality of the base blocks. The interpolation processor generates an interpolation block. The waveform synthesizer generates a new impulse response by arranging the interpolation block between the two adjacent base blocks generated through adjustment of the time adjuster.12-03-2009
20100272291CAPACITOR MICROPHONE AND IMPEDANCE CONVERTER THEREFOR - An impedance converter for a capacitor microphone includes: a vacuum tube that receives an output signal from a capacitor microphone unit through a grid and with which the signal is output as an output from a cathode follower; an FET in cascade connection with the vacuum tube and that defines a current flowing in the vacuum tube; and a bias circuit that applies a bias voltage to the grid of the vacuum tube. The bias circuit includes: a first diode and a second diode that apply the bias voltage to the grid of the vacuum tube; the first diode and the second diode being connected in inverse parallel; and a bias resistor for applying the bias voltage at a constant level to the grid of the vacuum tube via the first diode or the second diode.10-28-2010
20100278357Signal processing apparatus, signal processing method, and program - A signal processing apparatus includes a source separation module for producing respective separation signals corresponding to a plurality of sound sources by applying an ICA (Independent Component Analysis) to observation signals produced based on mixture signals from the sound sources, which are taken by source separation microphones, to thereby execute a separation process of the mixture signals, and a signal projection-back module for receiving observation signals of projection-back target microphones and the separation signals produced by the source separation module, and for producing projection-back signals as respective separation signals corresponding to the sound sources, which are taken by the projection-back target microphones. The signal projection-back module produces the projection-back signals by receiving the observation signals of the projection-back target microphones which differ from the source separation microphones.11-04-2010
20090136062MICROPHONE CIRCUIT AND METHOD FOR ANALOG-TO-DIGITAL CONVERSION THEREIN - The invention provides a method for analog-to-digital conversion in a microphone circuit. First, a first gain is determined. A first analog signal is then amplified according to the first gain to obtain a second analog signal. The second analog signal is then converted from analog to digital to obtain a first digital signal. A second gain is then determined according to the first gain so that a product of the first gain and the second gain is kept constant. The first digital signal is then amplified according to the second gain to obtain a second digital signal.05-28-2009
20090316935DIGITAL MICROPHONE - An integrated circuit, configured to process microphone signals, where the integrated circuit comprises: a preamplifier (12-24-2009
20100177913MICROPHONE PREAMPLIFIER CIRCUIT AND VOICE SENSING DEVICES - A microphone preamplifier circuit is provided in a system on chip. An amplifier comprises a first input end, a second input end, and an output end. A bias voltage is provided by a bias voltage source. A first sensor is coupled to the first input end and the bias voltage source for sensing a first physical parameter and a second physical parameter. A second sensor is coupled to the second input end and the bias voltage source for sensing the first physical parameter, wherein the second sensor is insensitive to the second physical parameter. The output end of the amplifier outputs a difference of the first and second input ends whereby noises and interferences are reduced.07-15-2010
20120140956DIFFERENTIAL MICROPHONE CIRCUIT - There is provided an electret microphone comprising a junction gate-field-effect transistor (JFET) and a bias resistor connected to the JFET and supplying current to the JFET, whereby an electrical output is determined by measuring a differential voltage across the bias resistor.06-07-2012
20100296671System and Method of Changing a PWM Power Spectrum - In a particular embodiment, a circuit device includes a pulse edge control circuit to receive at least one pulse-width modulated (PWM) signal from a PWM source. The pulse edge control circuit is adapted to selectively apply a phase shift operation to the at least one PWM signal at integer submultiples of a frame repetition rate to produce at least one modulated PWM signal having a changed power spectrum. The pulse edge control circuit provides the at least one modulated PWM signal to at least one output of the pulse edge control circuit.11-25-2010
20100296670Impedance Converter For Microphone and Microphone - Vacuum tubes that receive output signals from microphone units through grids and with which the signals are output as outputs from cathode followers; FETs in cascade connection with the corresponding vacuum tubes and that define currents flowing in the vacuum tubes; and bias circuits that apply a bias voltage to the grids of the corresponding vacuum tubes are included. Pairs of such vacuum tubes, FETs, and fixed bias circuits are each symmetrically connected so that a balanced signal can be output from two cathode followers, and an adjuster is provided between the pair of fixed bias circuits, the adjuster adjusts currents flowing in the pair of vacuum tubes to achieve a balanced output.11-25-2010
20110110536Microphone Assembly with Integrated Self-Test Circuitry - The present invention relates to a condenser microphone assembly comprising an electro-acoustic transducer element comprising a diaphragm and a back plate, signal processing circuitry operatively connected to the transducer element so as to process signals generated by the transducer element, and a mode-setting circuitry for selectively setting the condenser microphone assembly in a test mode or an operational mode. The electro-acoustic sensitivity of the condenser microphone assembly, when operated in the test mode, is at least 40 dB lower than the corresponding electro-acoustic sensitivity of the assembly when operated in the operational mode. The present invention further relates to a method for determining a performance parameter of a signal processing circuitry mounted inside a housing of an assembled condenser microphone assembly.05-12-2011
20110110535Carbon nanotube speaker - A speaker includes an sound wave generator, at least one first electrode, at least one second electrode, an amplifier circuit, and a connector. The at least one first electrode and the at least one second electrode are electrically connected to the sound wave generator. The amplifier is electrically connected to the at least one first electrode and the at least one second electrode. The connector is electrically connected to the amplifier circuit. The sound wave generator includes a carbon nanotube structure and insulative reinforcement structure compounded with the carbon nanotube structure.05-12-2011
20110116656PULSE CODE MODULATION CONVERSION CIRCUIT AND METHOD - A circuit includes an enhanced frequency range linear pulse code modulation conversion circuit. The enhanced frequency range linear pulse code modulation conversion circuit is driven by a clock signal within a frequency range. The enhanced frequency range linear pulse code modulation conversion circuit provides enhanced frequency range linear pulse code modulated information. More specifically, the enhanced frequency range linear pulse code modulation conversion circuit is provided by selectively decimating and interpolating non-enhanced frequency range linear pulse code modulated information based on a desired output sampling frequency and the frequency range.05-19-2011
20090214057MICROPHONE BIAS CIRCUITS - A microphone bias circuit is disclosed. A current source provides a first current. A voltage buffer provides a first reference voltage. A microphone coupled between the current source and the first reference voltage receives acoustic waves and converts the received acoustic waves to a second current. A loading device coupled between the current source and a second reference voltage lower than the first reference voltage outputs an output voltage according to the first current and the second current.08-27-2009
20100226512PRESENTATION AUDIO SYSTEM - A presentation audio system with two dual-mode, dual-channel, wireless IR microphone/controllers that concurrently transmit multiplexed audio and command IR signals to IR sensors communicating to an amplifier that sends amplified audio to one or more speakers, responsive to the received commands. Each wireless IR microphone/controller includes a microphone and controller in a housing with manual controls and separate redundant groups of transmitting IR LEDs. The amplifier is controlled as to volume, audio sources selected, and control closure operation. First mode controls the audio of the IR microphone/controller that is set in the first mode and second mode controls all audio sources in the system. One manual control is a control closure that may be used to initiate a building alarm or for other purposes. A headset microphone jack enables use of the IR microphone/controller as an IR transmitter. A dual recharger usable vertically or horizontally is included.09-09-2010
20110150243CHARGING CIRCUIT AND AMPLIFIER - A charging circuit comprising: 06-23-2011
20110075863Condenser Microphone - There is provided a capacitor microphone comprising a microphone capsule (03-31-2011
20100322439CAPACITOR MICROPHONE UNIT AND CAPACITOR MICROPHONE - A diaphragm adhering to a diaphragm holder and vibrating upon receiving a sound wave; and a fixed pole facing the diaphragm with a space from the diaphragm to form a capacitor with the diaphragm are included. A surface of the diaphragm holder adhering to the diaphragm is flat polished. The fixed pole is made of a flexible material. A surface of the fixed pole facing the diaphragm holder is pressure welded along the flat polished surface of the diaphragm holder.12-23-2010
20090316936Pulse detection apparatus, method for manufacturing the same and connector unit - A pulse detection apparatus including: a connector unit capable of connecting earphones; a first cable that is joined to the connector unit, and connected to a portable device; a second cable that connects the portable device and a pulse sensor to each other; and a cover portion that covers the connector unit such that the earphones are connectable to the connector unit, and covers the second cable such that the second cable passes through the inside of the cover portion.12-24-2009
20090268926SEMICONDUCTOR INTEGRATED CIRCUIT AND CONDENSER MICROPHONE - A semiconductor integrated circuit for a condenser microphone according to one exemplary aspect of the present invention includes a first resistor, a second resistor, a power supply terminal, a first capacitor, and a first diode. The first resistor and the second resistor are connected between a drain of an output transistor and an output terminal in series. The power supply terminal is connected to a source of the output transistor. The first capacitor is arranged between the power supply terminal and a connection point of the first resistor and the second resistor. The first diode is connected in parallel with the first capacitor.10-29-2009
20120308048Communications Headset Power Provision - Electric power is provided to a two-way communications headset by creating a differential DC voltage potential between a ground conductor associated with a microphone of that headset and a ground conductor associated with an acoustic driver of that headset, thereby enabling that headset to refrain from drawing electric power from a more limited local power source.12-06-2012
20120308046CLASS D MICRO-SPEAKER - A micro-speaker. The micro-speaker includes a first plate, a second plate, and a diaphragm. The first plate is biased to a first voltage. The second plate is biased to a second voltage. The diaphragm is positioned between the first plate and the second plate and is configured to receive a digital signal. The digital signal causes the diaphragm to cycle between fully displaced toward the first plate and fully displaced toward the second plate, creating air pressure pulses that mimic the digital signal.12-06-2012
20120308045Microphone Assemblies With Through-Silicon Vias - Microphone assemblies may be provided that have microelectromechanical systems microphones and associated application-specific integrated circuits mounted to printed circuit boards. The application-specific integrated circuits may contain amplifier circuitry for amplifying microphone signals from the microphone. One or more though-silicon vias may be formed in the application-specific integrated circuit that serve as an acoustic port through which sound may pass. The application-specific integrated circuit may be embedded in the printed circuit board and the microphone may be mounted to the upper surface of the printed circuit board, the application-specific integrated circuit and microphone may be stacked on the upper surface of the printed circuit board, or the microphone and application-specific integrated circuit may be mounted to the printed circuit board so that the microphone is received within an opening in the printed circuit board.12-06-2012
20100166227CIRCUITS FOR BIASING/CHARGING HIGH IMPEDANCE LOADS - A charging circuit for charging/biasing high impedance loads such as capacitive loads. The circuit comprises an input for connecting to a voltage/charge source and an output for connecting to the load. A capacitor is connected between the output and a reference voltage such as ground and a reverse bias diode is connected between the input and the output terminals. The reverse bias diode is arranged to allow a reverse current to pass which is sufficient to compensate for current leakage at the output terminal or other parts of the circuit. The reverse bias diode is conveniently a polysilicon diode. The diode may be connected in parallel with a shunt device to allow for rapid charging during start up.07-01-2010
20090262956MICROPHONES WITH EQUAL SENSITIVITY - A microphone and a method for producing a microphone with a sensitivity stipulated within narrow limits. The microphone each has a microphone capsule and an amplifier. A network of passive components, preferably resistors, is allocated to the amplifier. The sensitivity of the microphone is measured and the passive components are then disconnected to change the amplification of amplifier in the desired manner.10-22-2009
20120014541AMPLIFYING DEVICE FOR CONDENSER MICROPHONE - An amplifying device for a condenser-microphone according to the present invention includes: a differential amplifier (01-19-2012
20120300959RIBBON MICROPHONE WITH USB OUTPUT - A USB ribbon microphone includes a ribbon diaphragm assembly, an amplification circuitry connected to the ribbon diaphragm assembly, an A/D converter connected to the amplification circuitry, and a USB output port connected to the A/D converter for selective connection with a USB input.11-29-2012
20100290644SILICON BASED CAPACITIVE MICROPHONE - A silicon based capacitive microphone includes a first printed circuit board, a second printed circuit board far away from the first printed circuit board, a transducer electrically mounted on the first printed circuit board, a controlling chip electrically mounted on the second printed circuit board, a connecting member located between the first and second printed circuit boards.11-18-2010
20120163634AUDIO INTERFACE DEVICE AND METHOD - The invention provides an audio interface device and method utilizing a single audio jack connector for plugging into a three-wire analog microphone or a three-wire digital microphone, thereby reducing dimensions and production costs thereof and an electronic system using the same. The audio interface comprises an audio jack connector, having first to third contacts electronically connected with the three-wire microphone plugged thereinto; and an audio processing device, detecting a type of the three-wire microphone plugged into the audio jack connector, outputting a clock signal to the three-wire microphone and receiving a digital audio signal from the three-wire microphone when the type is digital; or receiving analog audio signals from the three-wire microphone when the type is analog.06-28-2012
20090052696Electroacoustic transducer - An electroacoustic transducer includes a single package, a microphone provided in the single package, an amplifier provided in the single package, and a controller provided in the single package. The microphone converts an acoustic pressure into an electrical signal. The amplifier amplifies the electrical signal that is output from the microphone. The amplifier is configured to allow the gain to be adjustable. The controller controls the gain of the amplifier, with reference to the level of an output signal from the amplifier, so as to prevent the output signal from being clipped.02-26-2009
20090016548SUPER REGENERATIVE (SR) APPARATUS HAVING PLURALITY OF PARALLEL SR AMPLIFIERS TUNED TO DISTINCT FREQUENCIES - An apparatus, which may be configured as a receiver or transceiver, includes a plurality of super regenerative (SR) amplifiers coupled in parallel, wherein the SR amplifiers are tuned to distinct frequency bands, respectively. The apparatus may further include isolation amplifiers at the respective inputs and outputs of the SR amplifiers to prevent injection locking and reduce power leakage. The apparatus may include a circuit to reduce or substantially eliminate in-band jamming signals. The apparatus may form at least part of a wireless communications device adapted to receive signals from other wireless communications devices, adapted to transmit signal to other wireless communications devices, and adapted to both transmit and receive signals to and from other wireless communications devices.01-15-2009
20080298607AUDIO INTERFACE DEVICE AND METHOD - The invention provides an audio interface device and method utilizing a single audio jack connector for plugging into a three-wire analog microphone or a three-wire digital microphone, thereby reducing dimensions and production costs thereof and an electronic system using the same. The audio interface comprises an audio jack connector, having first to third contacts electronically connected with the three-wire microphone plugged thereinto; and an audio processing device, detecting a type of the three-wire microphone plugged into the audio jack connector, outputting a clock signal to the three-wire microphone and receiving a digital audio signal from the three-wire microphone when the type is digital; or receiving analog audio signals from the three-wire microphone when the type is analog.12-04-2008
20100202634MICROPHONE AND INTEGRATED CIRCUIT CAPIBLE OF ECHO CANCELLATION - The invention provides an integrated circuit of a microphone. In one embodiment, the integrated circuit receives a first signal converted from a sound and receives a reference signal with a digital format for echo cancellation. In one embodiment, the integrated circuit comprises a pre-amplifier, an analog-to-digital converter, a digital signal processor, and a post amplifier. The pre-amplifier amplifies the first signal according to a first gain to obtain a third signal. The analog-to-digital converter converts the third signal from analog to digital to obtain a fourth signal. The digital signal processor cancels an echo component from the fourth signal according to the reference signal to obtain a fifth signal, and determines the first gain and a second gain, wherein a product of the first gain and the second gain is kept constant, and the first gain is determined so that an amplitude of the third signal is kept equal to an amplitude of the reference signal. The post-amplifier amplifies the fifth signal according to the second gain to obtain a second signal as an output of the integrated circuit.08-12-2010
20080219474MICROPHONE WITH VOLTAGE PUMP - An integrated circuit configured to provide a microphone output signal, comprising: a preamplifier coupled to receive an input signal, generated by either a first microphone member or a second microphone member, where one of the members is movable relative to the other microphone member; a voltage pump to output a pumped voltage; and a low-pass filter coupled to filter the pumped voltage from the voltage pump and to provide a bias voltage to either microphone member.09-11-2008
20120250898Processing Chip for a Digital Microphone and related Input Circuit and a Digital Microphone - A processing chip for a digital microphone and related input circuit and a digital microphone are described herein. In one aspect, the input circuit for a processing chip of a digital microphone includes: a PMOS transistor, a resistor, a current source, and a low-pass filter. The described processing chip possesses high anti high-frequency interference capabilities and the described input circuit possesses high high-frequency power supply rejection ratio.10-04-2012
20120250897Dual Cell MEMS Assembly - A transducer assembly utilizing at least two MEMS transducers is provided, the transducer assembly preferably defining either an omnidirectional or directional microphone. In addition to at least first and second MEMS transducers, the assembly includes a signal processing circuit electrically connected to the MEMS transducers, a plurality of terminal pads electrically connected to the signal processing circuit, and a transducer enclosure housing the first and second MEMS transducers. The MEMS transducers may be electrically connected to the signal processing circuit using either wire bonds or a flip-chip design. The signal processing circuit may be comprised of either a discrete circuit or an integrated circuit. The first and second MEMS transducers may be electrically connected in series or in parallel to the signal processing circuit. The first and second MEMS transducers may be acoustically coupled in series or in parallel.10-04-2012
20130129117AUDIO AMPLIFICATION CIRCUIT - Disclosed is an audio amplification circuit comprising: an input terminal for receipt of an audio input signal; a first preamplifier having an input operatively coupled to the input terminal and operable to provide a first amplified audio signal with a first signal amplification; a second preamplifier having an input operatively coupled to the input terminal and operable to provide a second amplified audio signal with a second signal amplification, smaller than the first signal amplification; a switch having a first input operatively coupled to the first preamplifier, a second input operatively coupled to the second preamplifier, and an output; an analogue-to-digital converter operatively coupled to the output of the switch and operable to provide a digital audio signal; a signal selection circuit operable to control the switch to selectively provide one of the first and second amplified audio signals on the output of the switch.05-23-2013
20110243350LOW NOISE ELECTRET MICROPHONE - An electret microphone having reduced noise due to reduced leakage current is provided. The microphone includes a flexible diaphragm, and sensor member disposed in opposing, spaced relation to the diaphragm and comprising a semi-conductor channel. At least one electret surface, comprised of a dielectric material having a permanently-embedded static electric charge, is disposed on one of the diaphragm and the sensor member. In turn, the semi-conductor channel of the sensor member has an electrical conductivity dependent upon relative movement of the diaphragm and support member responsive to acoustic signals incident upon the diaphragm, wherein the channel provides an output signal indicative of the acoustic signals. The electret surface may be disposed on the diaphragm. Alternatively, the electret surface may be disposed on the sensor member in spaced, face-to-face relation to an electrically conductive surface located on the diaphragm.10-06-2011
20130148827DIRECT DIGITAL SPEAKER APPARATUS HAVING A DESIRED DIRECTIVITY PATTERN - Direct digital speaker apparatus receiving a digital input signal and generating sound accordingly, the apparatus including: (a) an array of pressure-producing elements; and (b) a controller operative to compute a timing pattern determining if and when each pressure-producing element is actuated so as to achieve a desired directivity pattern; wherein said pressure-producing elements have the same amplitude.06-13-2013
20110293114Condenser microphone unit and method of manufacturing diaphragm assembly of condenser microphone - This invention provides a condenser microphone unit having a diaphragm assembly in which a diaphragm does not attach to a fixed electrode even if a polarization voltage is increased. A condenser microphone unit is provided having a diaphragm assembly 12-01-2011
20130195288Single-Wire Programmable MEMS Microphone, Programming Method and System Thereof - The present invention provides a single wire programmable Micro Electromechanical System (MEMS) microphone and a programming method and system thereof. The single wire programmable MEMS microphone includes an MEMS sensor and an Application Specific Integrated Circuit (ASIC) chip connected to each other; the MEMS sensor is used for implementing acoustic-electric conversion; the ASIC chip includes an OUT interface, so that an upper computer judges, according to an output signal of the OUT interface, whether the ASIC chip is in a normal start mode or a programming mode, where if the output signal of the OUT interface is at a high level, the ASIC chip is in the normal start mode, and otherwise, the ASIC chip enters the programming mode. Through the present invention, multiplexing of the OUT interface of the MEMS microphone is implemented, and gain configuration for the OTP memory in the ASIC chip is implemented by multiplexing the OUT interface, thereby achieving calibration of the gain of the MEMS microphone product after package.08-01-2013