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INCLUDING FREQUENCY CONTROL

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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
381103000 Having automatic equalizer circuit 43
381099000 Having crossover filter 22
381101000 Automatic tone control 18
Entries
DocumentTitleDate
20130044896Virtual Bass Synthesis Using Harmonic Transposition - In some embodiments, a virtual bass generation method including steps of: performing harmonic transposition on low frequency components of an input audio signal (typically, bass frequency components expected to be inaudible during playback of the input audio signal using an expected speaker or speaker set) to generate transposed data indicative of harmonics (which are expected to be audible during playback, using the expected speaker(s), of an enhanced version of the input audio which includes the harmonics); generating an enhancement signal in response to the transposed data; and generating an enhanced audio signal by combining (e.g., mixing) the enhancement signal with the input audio signal. Other aspects are systems (e.g., programmed processors) and devices (e.g., devices having physically-limited bass reproduction capabilities, such as, for example, a notebook, tablet, mobile phone, or other device with small speakers) configured to perform any embodiment of the method.02-21-2013
20130028442Loudspeaker system - A loudspeaker that can be bi-wired or not according to a user's preference comprises a case in which is provided a plurality of audio drivers supplied by a respective plurality of audio networks, the networks being supplied (in turn) by a respective plurality of input terminal pairs, further comprising at least one switch bridging the terminals of different pairs, and adapted to selectively connect the terminals to each other.01-31-2013
20100046771MULTIPLE-USE ACOUSTIC PORT - Two or more acoustic transducers share the same acoustic port in a device. The acoustic properties—such as acoustic impedance and frequency response—of the shared acoustic port are matched to each of the two or more acoustic transducers. To accomplish acoustic impedance matching, a separate back volume is provided for each of the acoustic transducers, matched to that transducer. Frequency response matching can be accomplished by the design of the transducer itself, but also by providing an adjacent element in the acoustic system of the transducer. One transducer may serve as an element in the acoustic system of another transducer. Frequency response adjustment of an individual element may also affect acoustic impedance of the entire port-transducer system.02-25-2010
20100040244METHOD AND SYSTEM FOR AUDITORY ENHANCEMENT AND HEARING CONSERVATION - A digital and/or analog signal processing system and method for auditory enhancement and hearing conservation includes providing an audio signal with high intensity peaks, clipping the audio signal by limiting peak power to produce a clipped signal, and amplifying the clipped signal.02-18-2010
20130083945NOVEL EFFICIENT DIGITAL MICROPHONE DECIMATION FILTER ARCHITECTURE - A new and more efficient filtering system (e.g., digital microphone decimation filter architecture system) is described. A key to this architecture is the use of two parallel filter paths. Each path operates at the output sample rate, and comprises a shorter FIR filter followed by a series of allpass stages (e.g., implementing IIR filters). The FIR filter is designed to remove all but the last octave of out-of-band noise. The allpass stages are designed such that when the two paths are summed together, the out-of-band noise for the final octave cancels out, leaving only the desired sign04-04-2013
20130051581AUDIO SIGNAL PROCESSING CIRCUIT - An audio signal processing circuit includes: a first low-pass filter configured to pass a component whose frequency is in a band lower than a lowest reproducible frequency of a speaker out of an audio signal inputted for reproduction by the speaker; a first high-pass filter substantially similar in phase characteristics to the first low-pass filter configured to pass a component whose frequency is in a band higher than the lowest reproducible frequency of the speaker out of the audio signal inputted for reproduction by the speaker; a harmonic generation unit configured to generate a harmonic from the audio signal having passed through the first low-pass filter; and a first addition unit configured to add the audio signal according to an output of the harmonic generation unit to the audio signal according to an output of the first high-pass filter.02-28-2013
20090304204Controlling reproduction of audio data - For controlling the acoustic reproduction of audio data containing audio elements that are periodically repeated, movement data regarding a movement process is detected. The movement process contains recurring events. Reproduction of the audio data is controlled using the movement data in such a way that at least within a certain period, one out of n audio elements that are periodically repeated is reproduced in synchrony with the moment one of the recurring events occurs (synchronization) or is reproduced temporally offset by a given amount of time from the moment one of the recurring events occurs (offset synchronization). The value n represents a positive integer.12-10-2009
20120219164PRODUCING SOUNDS IN A VIRTUAL WORLD AND RELATED SOUND CARD - Disclosed are a method and apparatus for producing sounds in a virtual world, as well as a sound card. The method comprises the steps of determining a spring mass model of an object in the virtual world based on a 3D model of the object; analyzing force components produced on the 3D model by a collision in the virtual world; and generating sounds produced by the collision according to the spring mass model and the force components. By considering sound material of the object in the virtual world, the method, apparatus, and sound card may produce sounds in the virtual world more vividly and in real time.08-30-2012
20090041265SOUND SIGNAL PROCESSING DEVICE, SOUND SIGNAL PROCESSING METHOD, SOUND SIGNAL PROCESSING PROGRAM, STORAGE MEDIUM, AND DISPLAY DEVICE - A sound signal processing device causes an amplifier to amplify a low frequency signal and synthesizes the amplified low frequency signal with a middle or high frequency signal so as to output the resultant output signal. A gain control section controls a gain of the amplifier on the basis of an amplitude of the output signal. As a result, it is possible to amplify the low frequency signal without any clipping in a receiving end device and without any unstable volume of a middle or high frequency component.02-12-2009
20130058500FREQUENCY BAND EXTENDING APPARATUS, FREQUENCY BAND EXTENDING METHOD, PLAYER APPARATUS, PLAYING METHOD, PROGRAM AND RECORDING MEDIUM - A player apparatus for playing an input signal after band-extending the input signal includes: an extension controller to determine an extension start band for the input signal in accordance with information relating to the input signal; and a band divider to divide the input signal into a plurality of sub-band signals. The frequency band is extended on the basis of a plurality of the sub-band signals on a side lower than the extension start band, among the plurality of sub-band signals into which the input signal is band-divided by the band divider.03-07-2013
20130058499INFORMATION PROCESSING APPARATUS AND INFORMATION PROCESSING METHOD - An information processing apparatus includes: a sound source configured to generate sound waves; and a housing configured to incorporate the sound source and include a first main surface and a second main surface opposite to each other, the first main surface including a groove-like concave portion configured to communicate in one axial direction along the second main surface, and an opening for transmitting sound waves of the sound source, the opening being provided in an area of the concave portion and at a position offset from the middle in the one axial direction of the first main surface.03-07-2013
20110058685METHOD OF SEPARATING SOUND SIGNAL - The present invention obtains a separated signal from an audio signal based on the anisotropy of smoothness of spectral elements in the time-frequency domain. A spectrogram of the audio signal is assumed to be a sum of a plurality of sub-spectrograms, and smoothness of spectral elements of each sub-spectrogram in the time-frequency domain has directionality on the time-frequency plane. The method comprises obtaining a distribution coefficient for distributing spectral elements of said audio signal in the time-frequency domain to at least one sub-spectrogram based on the directionality of the smoothness of each sub-spectrogram on the time-frequency plane, and separating at least one sub-spectrogram from said spectral elements of said audio signal using said distribution coefficient.03-10-2011
20090238380SPATIALLY ROBUST AUDIO PRECOMPENSATION - A discrete-time audio precompensation filter is designed based on a linear model that describes the dynamic response of a sound generating system at p>1 listening positions. The filter construction is based on providing information (S2) representative of n non-minimum phase zeros {z,} that are outside of the stability region |z|=09-24-2009
20120114143SOUND OUTPUT APPARATUS - A sound output apparatus includes a mixing unit configured to mix an L (left) channel voice signal and an R (right) channel voice signal to generate an L+WF signal and an R−WF signal containing a mix of a WF(woofer) channel voice signal, and power amplifiers which amplify the L+WF signal and R−WF signal. The outputs of the power amplifiers are BTL-connected to a WF channel speaker. Thus, the mixing unit provided in a previous stage of the power amplifiers generates the WF channel voice signal, which eliminates the necessity for a passive low pass filter in a subsequent power amplifier stage.05-10-2012
20120114142ACOUSTIC SIGNAL PROCESSING APPARATUS, PROCESSING METHOD THEREFOR, AND PROGRAM - The present invention relates to an acoustic signal processing apparatus that suppresses auditory noise caused in a difference signal generated by acoustic signals of a plurality of channels, a processing method therefor, and a program.05-10-2012
20130163782Sound Processing Apparatus and Sound Processing Method - A sound processing apparatus includes an information acquisition unit which acquires control information including at least one of mode information for designating a reproduction mode of the sound processing apparatus and attribute information for designating an attribute of an audio content represented by a sound signal, a frequency band expansion unit which performs frequency band expansion processing for adding an expanded component generated from the sound signal to the sound signal, and a control unit which changes parameters to be applied to the frequency band expansion processing in accordance with the control information acquired by the information acquisition unit.06-27-2013
20090046871METHOD AND APPARATUS FOR AUDIO PROCESSING - A method and apparatus for introducing a time-varying time delay randomly into the individual reproduction channels of a sound recording, two in the case of binaural presentation. This emulates the temporal aspect of microphone and/or listener motion. The present invention may be applied as a unidirectional process. No preparation of the source material is required. It can be applied to any multichannel audio signal set. It can process analog or digital signals. The process may be used with headphones, loudspeakers, hearing aids or similar assistive hearing devices.02-19-2009
20100086148APPARATUS AND METHOD FOR PROCESSING AUDIO SIGNAL - An apparatus for processing an audio input signal is provided and includes an audio processing circuit and an audio compressing circuit. The audio processing circuit receives the audio input signal, and enhances a first frequency part of the audio input signal to output a bass-enhancement signal. The audio compressing circuit is coupled to the audio processing circuit, and reduces a gain of a second frequency part of the bass-enhancement signal to output an audio output signal.04-08-2010
20090080675DYNAMIC BASS BOOST FILTER - Bass frequencies of audio can be dynamically boosted using various techniques and tools. The described techniques and tools can be applied separately or in combination. Bass frequencies of audio can be boosted using a linear combination of an input audio signal and output of a high-pass filter. For example, bass frequencies of audio can be boosted by applying a high-pass filter to an input audio signal to produce an output of the high-pass filter, determining a current level, determining a target gain amount, dynamically adjusting the input audio signal and the output of the high-pass filter, and combining the gain-adjusted signals to produce an output signal. A dynamic bass boost filter can comprise a high-pass filter and a dynamic boost module.03-26-2009
20110299704Frequency-tracked synthesizer employing selective harmonic amplification and/or frequency scaling - This invention relates to effects processing of a monophonic analog signal, meaning a signal whose frequency components are all integer multiples of a first fundamental frequency. For example, the signal could come from almost any musical instrument, voice included. However, for generality, the invention is not restricted to cases where the signal source is musical. The digital signal processing is simplified as a result of the DSP being clocked at a constant multiple of f12-08-2011
20090041266Electrostatic loudspeaker driver - An electrostatic loudspeaker driver includes a class-D amplifier and a demodulator circuit. The class-D amplifier is operated with a PWM signal, creating an amplified digital signal according to an input signal. A low-pass filter in the demodulator circuit filters out the PWM carrier frequency in the digital signal and retrieves an audio signal therefrom. The efficiency is improved significantly and heat sink is no longer needed.02-12-2009
20100278356AUDIO AMPLIFICATION APPARATUS - A method of adjusting frequency-dependent amplification in an audio amplification apparatus. The audio amplification apparatus includes a forward transfer path (11-04-2010
20120321103IN-EAR HEADPHONE - A headphone device includes a housing having a leakage hole to reduce pressure between a user's ear and the housing, a speaker positioned within the housing, and an audio processing module. The audio processing module is configured to receive an audio signal from an audio device, determine whether the audio signal includes at least a predetermined level of audio having a frequency in a first range of frequencies, transmit a first leakage control signal to a leakage hole valve when it is determined that the audio includes at least the predetermined level of low frequency audio; and transmit a second leakage control signal to the leakage hole valve when it is determined that the audio does not include at least the predetermined level of low frequency audio. The leakage hole valve is configured to close the leakage hole upon receipt of the first leakage control signal and open the leakage hole upon receipt of the second leakage control signal.12-20-2012
20100119081ELECTROACOUSTICAL TRANSDUCING WITH LOW FREQUENCY AUGMENTING DEVICES - A method for clipping and post-clipping processing an audio signal, includes clipping an audio signal to provide a clipped audio signal; filtering, by a first filter, the audio signal to provide a filtered unclipped audio signal; and filtering, by a second filter, the clipped audio signal to provide a filtered clipped audio signal. The method further includes differentially combining the filtered clipped audio signal and the clipped audio signal to provide a differentially combined audio signal; and combining the filtered unclipped audio signal and the differentially combined audio signal to provide an output signal.05-13-2010
20120033831Microphone with Adjustable Characteristics - A microphone comprises a movable diaphragm 02-09-2012
20100086147HARMONICS GENERATION APPARATUS AND METHOD THEREOF - A harmonic generating apparatus and the method are provided, which are used to enhance the quality of the bass audio signals. The method includes the steps of: providing a frequency signal having a present level and a preceding level; comparing the present level with the preceding level to generate a compared result; and generating the plurality of harmonics based on the compared result.04-08-2010
20100128900ADAPTER ACCESSORY FOR ELECTRONIC DEVICE SHARING - Users with headsets may share an electronic device such as a portable computer or handheld device. The electronic device may have a connector such as an audio jack for receiving mating audio plugs on headsets. During normal operation with a single user, audio signals may be conveyed through the audio jack to the headset of the single user. When more than one user wishes to share the electronic device, an adapter accessory may be inserted into the audio jack of the electronic device. The headset of each user may be plugged into mating audio jacks in the adapter accessory. Circuitry in the adapter accessory may receive and process user input from each of the users. User input may be used to make local audio adjustments in the adapter accessory. User input may also be provided from the adapter accessory to the electronic device for processing.05-27-2010
20110170711Audio Encoder, Audio Decoder, Methods for Encoding and Decoding an Audio Signal, and a Computer Program - An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error.07-14-2011
20110170710METHOD AND APPARATUS FOR ADJUSTING VOLUME - A method of adjusting volume removes an audio signal of a first frequency band from audio signals, and increases the volume of the audio signal from which the signal of the first frequency band is removed.07-14-2011
20110170712SOUND REPRODUCING APPARATUS - In a sound reproducing apparatus, part of a frequency band where mode-coupled vibration can be excited is regarded as a carrier frequency. A frequency of mode coupling, with a low rate of change in vibration displacement with respect to the frequency, is regarded as a carrier signal so that a signal in an audible band which is outputted from an audible band signal source can be demodulated and reproduced with stable sound pressure in a broad frequency band.07-14-2011
20090285412INTEGRATED CIRCUIT BIASING A MICROPHONE - The invention provides an integrated circuit. The integrated circuit receives a first signal from a microphone via a first node. In one embodiment, the integrated circuit comprises a biasing circuit and a buffering circuit. The biasing circuit is coupled between the first node and a second node, drives the microphone with a first voltage source, and filters the first signal to generate a second signal at the second node. In one embodiment, the biasing circuit comprises a first resistor, a first capacitor, and a load element. The first resistor is coupled between the first voltage source and the first node. The first capacitor is coupled between the first node and the second node. The load element is coupled between the second node and a second voltage source. The buffering circuit is coupled between the second node and a third node and buffers the second signal to generate a third signal at the third node.11-19-2009
20100128901WIND NOISE REJECTION APPARATUS - An apparatus for reduction of wind noise comprised of an electro-acoustic transducer arrangement with at least one transducer element. The exposed structure is covered with at least one thin layer of wind-resistive material, in the form of a mesh, and optionally includes one or more further layers of felt, foam and/or mesh in any combination. Where a plurality of elements is provided, the electrical outputs of the elements may be added together to provide an output signal with increased signal to wind noise ratio. The signal may be subject to additional signal processing such as filtering and/or level sensitive signal inhibition.05-27-2010
20080273717Audio amplifier thermal management using low frequency limiting - A digital audio speaker system for a digital audio player that includes a housing and a control unit positioned in the housing. An amplifier is positioned in the housing and connected with the control unit and a speaker system. A frame assembly is positioned in the housing that includes a motorized drive assembly. A drawer assembly is movably connected with the motorized drive assembly. The motorized drive assembly is operable to move the drawer assembly between an open position and a closed position.11-06-2008
20080273718Bass enhancing method, signal processing device, and audio reproducing system - If the absolute value of the current sample is greater than or equal to an envelope value at the immediately preceding sample, an envelope value at the current sample is made greater than the envelope value at the immediately preceding sample. If the absolute value of the current sample is smaller than the envelope value at the immediately preceding sample and a count value C does not reach a predetermined number N, the count value C is incremented by one and the envelope value at the current sample is held at the envelope value at the immediately preceding sample. If the absolute value of the current sample is smaller than the envelope value at the immediately preceding sample and the count value C reaches the predetermined number N, the envelope value at the current sample is made smaller than the envelope value at the immediately preceding sample.11-06-2008
20080279395Feedback Compensation in a Sound Processing Device - There is disclosed a sound processing device (11-13-2008
20080292113METHOD AND APPARATUS FOR AUDIO PATH FILTER TUNING - Methods and apparatus for tuning the audio path response of an audio device are described herein. The audio output of an audio device is captured and monitored over a predetermined frequency band. The frequency response of the captured audio output can be compared to one or more predetermined limits defining an acceptable frequency response. One or more dynamically configurable bands can be defined, and one or more parameters affecting the response within each configurable band can be adjusted. A simulated frequency response is produced and filter coefficients for a corresponding filter within the audio path are determined. The filter coefficients can be loaded to a digital filter within the audio path to modify the actual frequency response produced by the audio device.11-27-2008
20120045075Energy saving PWM sound device - An energy saving PWM sound device forms a frequency-dependent impedance device implemented on the PWM output of the voice-ICs in series to lower the power consumption and to enhance sound quality of the voice-IC products. The device includes a hollow core body and an elongated conductive element. The core body has a top rim, a bottom rim, and two side rims to define a through channel therewithin. The conductive element winds around the top rim of the core body, wherein two ends of the conductive element are adapted for connecting with the PWM output, such that when the conductive element is electrically conducted, the core body acts as an inductor at lower frequency and a frequency-dependent resistor in series with the inductor at higher frequency for blocking most of PWM carrier frequency so as to reduce the power consumption of the voice-ICs product.02-23-2012
20080212797BASS BOOST FILTERING TECHNIQUES - Bass frequencies of audio can be boosted using various techniques and tools. The described techniques and tools can be applied separately or in combination. For example, bass frequencies of audio can be boosted using an integer bass boost filter by receiving user-settable parameters, such as “c” and “s” coefficients, and implementing the integer bass boost filter using a coupled form structure implementation and the user-settable parameters. Bass frequencies of audio can also be boosted using an integer bass boost filter that is configured to use any of plural coupled form structure implementations. Bass frequencies of audio can be also be boosted using a linear combination of an input audio signal and output of a high-pass filter.09-04-2008
20090161887DATA PROCESSING APPARATUS AND METHOD OF CONTROLLING THE SAME - According to one embodiment, a data processing apparatus includes a control section which, when the performance of the memory device is at a predetermined threshold value or higher, stores the frequency while associating it to a volume of the sound generated and increase a frequency of sound generated next by a certain frequency band from the frequency, when the performance of the memory device is less than the predetermined threshold level, decreases the volume of the sound by a certain volume level from the maximum volume, when the volume corresponding to the highest frequency, which is the predetermined frequency, is stored, finishes the measurement, and generates the sound from the lowest frequency to the highest frequency from the loudspeaker in accordance with the volume stored and the frequency corresponding to the volume.06-25-2009
20110142258Apparatus for Processing an Audio Signal - An apparatus for processing an audio signal to focus an acoustic signal by an arrangement of a plurality of loudspeakers comprises a frequency analyzer, a signal processor and a signal output interface. The acoustic signal is based on the audio signal. The frequency analyzer is configured to determine a fundamental frequency in a frequency spectrum of the audio signal depending on a geometry parameter of the arrangement of the plurality of loudspeakers. The signal processor is configured to adapt an overtone of the fundamental frequency to obtain the processed audio signal and the signal output interface is configured to output the processed audio signal to the plurality of loudspeakers.06-16-2011
20090252346METHOD OF PROCESSING AUDIO FILES - A method of processing audio files includes the steps of providing an audio frequency adjusting section, via which one or more first audio files may be changed in the frequency property thereof to create one or more second audio files without the need of opening the first audio files. In this manner, a plurality of audio files may be easily and quickly modified at one time via the audio frequency adjusting section to shorten the time needed to optimize the tone quality of the audio files.10-08-2009
20120195442OVERSAMPLING IN A COMBINED TRANSPOSER FILTER BANK - The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank (08-02-2012
20120195441METHOD OF OUTPUTTING AUDIO SIGNAL AND AUDIO SIGNAL OUTPUT APPARATUS USING THE METHOD - An audio signal output apparatus includes a modulation signal generator for generating a first modulation signal by pulse-modulating an input audio signal of one channel using a first carrier signal or a first sampling clock, which has a first frequency; a vacuum tube filter unit comprising a vacuum tube and for generating a vacuum tube signal by allowing the first modulation signal to pass through the vacuum tube; a frequency modulation unit for generating a second modulation signal by pulse-modulating the vacuum tube signal; and a power switching amplifier for outputting an amplification signal corresponding to the second modulation signal.08-02-2012
20100183168SEMICONDUCTOR DEVICE - A semiconductor device is disclosed. The semiconductor device includes a digital audio circuit which converts an input digital signal into an analog audio signal, a DC-DC converter having a switching power source circuit, and an audible frequency determining circuit. In order that a difference between a frequency of a first clock signal for digital to analog conversion which is used in the digital audio circuit and a frequency of a second clock signal for switching control which is used in a DC-DC converter exceeds a maximum audible frequency, a frequency comparing circuit in the audible frequency determining circuit outputs a signal to a frequency changing circuit in the DC-DC converter. The frequency changing circuit causes a second oscillating circuit to change the second frequency.07-22-2010
20110058686AUDIO PROCESSING DEVICE AND AUDIO PROCESSING METHOD - There is provided a sound processing apparatus and a sound processing method which are capable of reproducing discrete data with a high-quality sound matching users' preferences. In a sound processing means 03-10-2011
20100239106Probabilistic Method of Loudspeaker Detection - A method and apparatus for enhancing cutoff detection of a loudspeaker. The method comprising retrieving a loudspeaker model cutoff and model error, generating a probability distribution of the cutoff frequency based on the retrieved models, and utilizing the generated probability distribution to enhance the detection of the cutoff of the loudspeaker.09-23-2010
20100142727SOUND PROCESSING METHODS AND APPARATUS - A sound processing method includes transforming an input signal from a time domain to a frequency domain to produce a spectrum, detecting a peak of the spectrum, calculating a target attenuation amount based on one of the input signal and the spectrum, calculating attenuation amounts of respective frequency components of the spectrum based on the target attenuation amount and the detected peak, correcting levels of the spectrum by attenuating the spectrum in response to the calculated attenuation amounts of respective frequency components, and performing inverse frequency transform with respect to the level-corrected spectrum to produce an output signal.06-10-2010
20100008521VOLUME AND TONE CONTROL IN DIRECT DIGITAL SPEAKERS - A system that includes a direct digital speaker volume control device configured to be coupled to a direct digital speaker. The direct digital speaker includes many pressure producing elements being adapted to generate a sound at a sound pressure level (SPL) and at a given frequency in response to an input signal, without using digital to analog converter. The direct digital speaker inherently exhibits a frequency response throughout its entire frequency range. The direct digital speaker volume control device includes a module for providing few filters each having a distinct cutoff frequency such that each filter exhibits no attenuation below its cutoff frequency and an attenuation response above the filter's cutoff frequency. And a selector for selecting one of the filters according to a selection criterion that depends on a desired volume and frequency of generated sound, and applying the filter to the input signal for generating a filtered signal that fed to the speaker.01-14-2010
20110150240MODULATION DEVICE AND DEMODULATION DEVICE - A modulation device includes: a spread code generation unit which generates a spread code having a predetermined cycle; an audio signal input unit to which an audio signal is input; a first modulation unit which phase-modulates the spread code in each cycle on the basis of a data code; and a combining unit which combines the audio signal with a modulation signal which has been generated on the basis of the phase-modulated spread code and distributed in a frequency range higher than a predetermined frequency to output a combined signal.06-23-2011
20090074204Information processing apparatus, information processing method, and program - According to the present invention, a parameter adjustment section setting, in accordance with a first parameter indicating a variant factor for playback speed that is input, a second parameter and a third parameter, and a signal processing section adjusting at least one of playback speed and pitch of a sound of an audio signal based on the second parameter and the third parameter are provided, wherein the signal processing section adjusts the playback speed of the audio signal when the variant factor for playback speed that is input is less than a predetermined threshold and adjusts the playback speed and the pitch of a sound of the audio signal when the variant factor for playback speed that is input is above the predetermined threshold.03-19-2009
20090067644Economical Loudness Measurement of Coded Audio - Measuring the loudness of audio encoded in a bitstream that includes data from which an approximation of the power spectrum of the audio can be derived without fully decoding the audio is performed by deriving the approximation of the power spectrum of the audio from said bitstream without fully decoding the audio, and determining an approximate loudness of the audio in response to the approximation of the power spectrum of the audio. The data may include coarse representations of the audio and associated finer representations of the audio, the approximation of the power spectrum of the audio being derived from the coarse representations of the audio. In the case of subband encoded audio, the coarse representations of the audio may comprise scale factors and the associated finer representations of the audio may comprise sample data associated with each scale factor.03-12-2009
20110013783OVERTONE PRODUCTION DEVICE, ACOUSTIC DEVICE, AND OVERTONE PRODUCTION METHOD - When boosting treble, first a signal X(T) of a fundamental tone component which is to be a subject of overtone production is extracted by a fundamental tone extraction filter section 01-20-2011
20110019838AUDIO PROCESSING IN A PORTABLE LISTENING DEVICE - The invention relates to a method of processing an audio signal in a portable listening device, the audio signal comprising a low frequency part having an LF-bandwidth Δf01-27-2011
20110044471GENERATION OF A DRIVE SIGNAL FOR SOUND TRANSDUCER - An apparatus for generating a drive signal for a sound transducer (02-24-2011
20110116655Apparatus and Method for Audio Conversion - An apparatus and method for audio conversion is provided to upgrade the resolution of transmission frequency of an FM (frequency modulation) transmitter and reduce the size of the FM transmitter by applying frequency coarse tune and fine tune. The apparatus comprises a digital FM modulator, a digital frequency synthesizer, a signal converter, and an analog frequency converter. The digital FM modulator modulates a digital audio input signal into a first digital audio signal. The digital frequency synthesizer converts the first digital audio signal into a second digital audio signal, whose frequency is determined according to a first frequency conversion parameter. The signal converter converts the second digital audio signal into an analog audio signal. The analog frequency converter generates an audio transmission signal with a predetermined frequency according to a second clock signal and the analog audio signal while the second clock signal is generated according to a first clock signal.05-19-2011
20100150377SOUND OUTPUTTING APPARATUS TO CORRECT SOUND QUALITY AND METHOD OF CORRECTING SOUND QUALITY THEREOF - A sound outputting apparatus to correct sound quality and a method of correcting sound quality thereof includes a speaker to output a sound signal, a remaining vibration detector to detect a remaining vibration of the speaker, a signal processor to generate an offset signal for the detected remaining vibration and output a correction signal in which the input sound signal is mixed with the generated offset signal, and a power amplifier to amplify the correction signal and transmit the correction signal to the speaker. Accordingly, sound quality can be corrected without a mechanical damping device.06-17-2010
20120243707SYSTEM AND METHOD FOR PROCESSING SOUND SIGNALS IMPLEMENTING A SPECTRAL MOTION TRANSFORM - A system and method are provided for processing sound signals. The processing may include identifying individual harmonic sounds represented in sound signals, determining sound parameters of harmonic sounds, classifying harmonic sounds according to source, and/or other processing. The processing may include transforming the sound signals (or portions thereof) into a space which expresses a transform coefficient as a function of frequency and chirp rate. This may facilitate leveraging of the fact that the individual harmonics of a single harmonic sound may have a common pitch velocity (which is related to the chirp rate) across all of its harmonics in order to distinguish an the harmonic sound from other sounds (harmonic and/or non-harmonic) and/or noise.09-27-2012
20120243706Method and Arrangement for Processing of Audio Signals - Method and arrangement in an audio handling entity, for damping of dominant frequencies in a time segment of an audio signal. A time segment of an audio signal is obtained, and an estimate of the spectral density or “spectrum” of the time segment is derived. An approximation of the estimate is derived by smoothing the estimate, and a frequency mask is derived by inverting the approximation. Frequencies comprised in the audio time segment are then damped based on the frequency mask. The method and arrangement involves no multi-band filtering or selection of attack and release times.09-27-2012
20090323984INFORMATION PROCESSING DEVICE, CONTROL METHOD THEREFOR, AND PROGRAM - An information processing device according to an embodiment of the present invention includes the following elements: a detection unit configured to detect an amount of change in position of an image data item that is displayed on a display screen; and a processing unit configured to perform image processing on the image data item in accordance with a detection result that is obtained by the detection unit, and to perform audio processing on an audio data item corresponding to the image data item in accordance with the detection result that is obtained by the detection unit.12-31-2009
20090052693Sound Reproducing Apparatus - A sound reproducing apparatus is structured to use a first dividing circuit and a determining circuit to analyze a frequency characteristic of an inputted signal and to output a signal adjusted by a first adjusting circuit to have a prescribed frequency characteristic by a switching by a switch circuit. Thus, when signals having different frequency characteristics are inputted, frequency characteristics of the input signals can be automatically adjusted without using an external signal and channels having different frequency characteristics can be reproduced by a single system to provide good speaker-reproduced sound.02-26-2009
20120230515BANDWIDTH EXTENSION OF A LOW BAND AUDIO SIGNAL - Estimation of a high band extension of a low band audio signal includes the following steps: extracting (S09-13-2012
20090323983Method and a system for reconstituting low frequencies in audio signal - The method comprises the steps of: filtering the audio signal by means of a lowpass filter (12-31-2009
20120201399SOUND SIGNAL PROCESSING APPARATUS, SOUND SIGNAL PROCESSING METHOD, AND PROGRAM - A sound signal processing apparatus includes a frequency analysis unit which executes frequency analysis of an input sound signal; a low-frequency envelope calculating unit which calculates low-frequency envelope information as envelope information of a low-frequency band based on a result of the frequency analysis; a high-frequency envelope information estimating unit which applies learned data generated in advance based on a sound signal for learning and generates estimated high-frequency envelope information corresponding to an input signal from the low-frequency envelope information corresponding to the input sound signal; and a frequency synthesizing unit which synthesizes a high-frequency band signal corresponding to the estimated high-frequency envelope information generated by the high-frequency envelope information estimating unit with the input sound signal and generates an output sound signal in which a frequency band is expanded.08-09-2012
20120033830AUDIO PROCESSING DEVICE AND AUDIO PROCESSING METHOD - There is provided a sound processing apparatus and a sound processing method which are capable of reproducing discrete data with a high-quality sound matching users' preferences. In a sound processing means 02-09-2012
20080267426Device for and a Method of Audio Data Processing - An audio data processing device (10-30-2008
20080205666Device For Processing Audio Data, A Method Of Processing Audio Data, A Program Element And A Computer-Readable Medium08-28-2008
20120121107Method for Signal Processing of Solid-Borne Sound Signals, in Particular in Motor Vehicles, and an Occupant Protection System with Corresponding Signal Processing Unit - The invention relates to a method for signal processing of solid-borne sound signals, in particular in motor vehicles, and a corresponding occupant protection system. A first-order high-pass filter is provided as a filter, wherein the −3 dB cut-off frequency thereof lies between the upper and lower operating frequency.05-17-2012
20110135112AUDIO SIGNAL PROCESSING DEVICE AND AUDIO SIGNAL PROCESSING METHOD - A technique is provided that can reduce any unnecessary distortion components of an input audio signal that arises as a result of varying the gain of the signal regardless of the type of the input audio signal.06-09-2011
20100322438METHOD AND CIRCUIT FOR CONTROLLING AN OUTPUT OF AN AUDIO SIGNAL OF A BATTERY-POWERED DEVICE - A method and a control circuit for controlling an output of an audio signal of a battery-powered device are described.12-23-2010
20100215192METHOD AND DEVICE FOR EXTENSION OF LOW FREQUENCY OUTPUT FROM A LOUDSPEAKER - A method and device for enhancing low frequency content of an input signal (X), e.g. bass boosting of an audio signal. An overdriving (ODR) of a low frequency signal part (LS08-26-2010
20100166217METHOD OF AND CIRCUIT FOR ADJUSTING FREQUENCY OF A DRIVING SIGNAL OF ELECTRONIC HORN BY MEANS OF CAPACITOR - The present invention discloses a driving circuit for electronic horn and a driving method for the electronic horn. The driving circuit includes an oscillating circuit, which generates a signal having oscillating frequency. Based on the signal, said driving circuit generates a driving signal to drive the electronic horn to produce sound. It is characterized in that said oscillating circuit includes a variable capacitor, and the oscillating frequency is changed by adjusting capacitance of the variable capacitor so as for the frequency of the driving signal to be consistent with working frequency of the electronic horn. The present invention overcomes the problem of mismatch between the frequency of circuit's driving signal and the horn's sounding diaphragm and horn's tone inflexion due to resistance change caused by vehicle vibration.07-01-2010
20100166218Sound Processor, Sound Reproducer, and Sound Processing Method - According to one embodiment, a sound processor includes a creating module, a filter, and a combining module. The creating module creates a plurality of first acoustic models based on a frequency characteristic that represents an acoustic property of an object to be measured. The first acoustic models are modeled with respect to resonance properties that vary depending on frequency bands. The filter extracts frequency components in the frequency bands from the respective first acoustic models. The combining module combines the frequency components extracted from the first acoustic models to create a second acoustic model.07-01-2010
20100158272ASYMMETRIC POLYNOMIAL PSYCHOACOUSTIC BASS ENHANCEMENT - Psychoacoustic bass audio signal enhancement can be accomplished using a monotonic, asymmetric polynomial distortion. A non-linear process applies a monotonic, asymmetric polynomial distortion function that has continuous first and second derivatives to generate even and odd harmonics of missing fundamental frequencies. This polynomial distortion produces the desired psychoacoustic effect with a fairly rapid roll-off so as to avoid unpleasant aliasing. Moreover, the lack of first-order discontinuities prevents clicks or glitches.06-24-2010
20110188672ACOUSTIC REPRODUCTION DEVICE - A sound reproduction apparatus reproduces a sound wave at a listening position. The sound reproduction apparatus includes a compensation processing unit for compensating an audible band signal having an audible band frequency, a carrier signal oscillator for generating a carrier signal, a modulator for outputting a modulated signal obtained by modulating the carrier signal based on the audible band signal compensated by the compensation processing unit, and a sound emission unit for outputting a sound wave depending on the modulated signal output from the modulator. The compensation processing unit compensates the audible band signal based on a distance from the sound emission unit to the listening position. This sound reproduction apparatus can reproduce the original audible band signal with a high fidelity regardless of the listening position.08-04-2011
20110216918Apparatus and Method for Generating a Bandwidth Extended Signal - An apparatus for generating a bandwidth extended signal from an input signal includes a patch generator and a combiner. The input signal is represented for first and second bands by first and second resolution data, respectively, the second resolution being lower than the first. The patch generator generates first and second patches from the first band of the input signal according to first and second patching algorithms, respectively. A spectral density of the second patch generated using the second patching algorithm is higher than a spectral density of a first patch generated using the first patching algorithm. The combiner combines both patches and the first band of the input signal to obtain the bandwidth extended signal. The apparatus scales the input signal according to the first and second patching algorithms or scales the first and second patches, so that the bandwidth extended signal fulfills a spectral envelope criterion.09-08-2011
20120308042Subwoofer Volume Level Control - An automatic adjustment of subwoofer volume levels relative to the main audio system volume and more specifically, to an improved algorithm control method for sub varying volume which allows adjustment of only the low frequency tones from the subwoofer relative to the main system volume.12-06-2012
20120308043Acoustic Manipulator Element - According to an exemplary embodiment of the present invention, an acoustic manipulator element is provided. The acoustic manipulator element is arrangable relatively to an acoustic source in a manner that the acoustic manipulator element splits frequency selectively sound waves originating from the acoustic source in a reflected and a through component, wherein at least a portion of the acoustic waves of the through component is attenuated by at most 15 dB for acoustic frequencies having a wavelength between 200 Hz and 16000 Hz compared to the sound waves of the acoustic source.12-06-2012
20110305352Cross Product Enhanced Harmonic Transposition - The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.12-15-2011
20090052694Pseudo deep bass generating device - A multiplier 02-26-2009
20100166219ELEVATED TOROID MICROPHONE APPARATUS - A video teleconferencing directional microphone includes three microphone elements arranged coincidentally on a vertical axis. The three microphone elements are placed on a supporting surface so that a first microphone element is on the surface, and the second and third microphone elements are elevated above the supporting surface. The directional microphone also includes three filters, a summing node, and an equalizer, which are used to shape the directivity pattern of the directional microphone into an elevated toroid sensitivity pattern. The elevated toroid sensitivity pattern increases sensitivity in the direction of a sound source of interest, but reduces sensitivity to any sound waves generated by noise sources at other locations.07-01-2010
20110064244Method and Arrangement for Processing Audio Data, and a Corresponding Computer Program and a Corresponding Computer-Readable Storage Medium - A method and an arrangement for processing audio data, and a corresponding computer program and a corresponding computer-readable storage medium, which can be used, in particular, in the field of audio software and sampling. At least a first spectrum with at least one first spectral property is removed from the spectrum of the audio data, the resulting spectrum of the audio data is transformed after removal of the at least one first spectrum, and the at least one first spectrum or at least one of the first spectrum and/or at least one second spectrum with at least one second spectral property are impressed on the transformed spectrum.03-17-2011
20110317851AUDIO SIGNAL MIXING DEVICE - An audio signal mixer can be applied to a DJ device and the like, for example. The audio signal mixer acquires a plurality of audio signals and acquires mixing rate information being information on a mixing rate of a plurality of the audio signals. The audio signal mixer decides an adjusting amount of balance between levels at every band when a plurality of the audio signals are mixed based on the mixing rate. A plurality of the audio signals are mixed at every band, adjusts the levels of the mixed signals of the respective bands based on the adjusting amount, adds the adjusted signals of the respective bands and outputs it as a mixed audio signal.12-29-2011
20110317852FREQUENCY CHARACTERISTICS CONTROL DEVICE - A frequency characteristics control device of a mixer mixes a first audio signal and a second audio signal inputted to the mixer. In the frequency characteristics control device, a characteristics detection section detects a first frequency characteristic of the first audio signal and a second frequency characteristic of the second audio signal. Based on the first and second frequency characteristics, a removal band detection section detects a removal band in which a level of the first audio signal is higher than a level of the second audio signal. A filtering process section performs a filtering process on the second audio signal so as to attenuate a component of the second audio signal in the removal band. A output section mixes the first audio signal inputted to the mixer and the second audio signal on which the filtering process section has performed the filtering process.12-29-2011
20110317850GENERATOR AND GENERATION METHOD OF PSEUDO-BASS - An absolute-value circuit outputs the absolute value of a signal SIN′ that corresponds to an input signal SIN. A clipping circuit clips the signal SIN′ that corresponds to the input signal, to a positive limit value and to a negative limit value. A first multiplier multiplies the signal SIN′ that corresponds to the input signal, by a predetermined coefficient. A first adder subtracts the output signal of the first multiplier from the output signal of the clipping circuit. A second adder sums a signal that corresponds to the output signal of the first adder and a signal that corresponds to the output signal of the absolute-value circuit. A third adder sums the input signal SIN and a signal that corresponds to the output signal of the second adder.12-29-2011
20110317849SIGNAL CONDITIONER FOR SUBWOOFERS - A signal conditioner for subwoofers has a band pass filter which passes a lower frequency spectrum of an input signal. The band pass filter includes a high pass filter having a predetermined corner frequency, and a low pass filter having about the same corner frequency, and produces a filtered input to a peak voltage follower circuit. The peak voltage follower circuit traces and smoothes the upper boundary of the filtered input to produce a control voltage. An analog multiplier multiplies the input signal by the control voltage produced by the peak voltage follower to produce an enhanced signal where low frequency transients have been magnified.12-29-2011
20120002824AUDIO EQUIPMENT AND A SIGNAL PROCESSING METHOD THEREOF - The present invention relates to an audio equipment (01-05-2012
20120002823ACOUSTIC CORRECTION APPARATUS, AUDIO OUTPUT APPARATUS, AND ACOUSTIC CORRECTION METHOD - According to one embodiment, an acoustic correction apparatus includes an input module, a calculator, a divider, a converter, an extractor, a synthesizer, and a generator. The input module receives an audio signal propagated through a sound field. The calculator calculates an impulse response from the audio signal. The divider divides the impulse response into first and second impulse responses. The converter converts the first and second impulse responses into first and second frequency spectrums. The extractor specifies an amplitude component of the first frequency spectrum with a peak relatively higher than that of the amplitude component of the first frequency spectrum, and extracts the peak as a resonance component. The synthesizer synthesizes a first property and a second property for attenuating the resonance component. The generator generates a correction filter for performing correction to obtain the synthesized property.01-05-2012
20120008798Method and Apparatus For Stereo Enhancement Of An Audio System - A processing apparatus which is suitable for signal communication with a system having at least one of an input module and an output module. The processing apparatus can be configured to receive input signals from the input module of the system. The processing apparatus includes a first channel processing portion to which the input signals are communicable. The first channel processing portion can be configurable to receive and process the input signals in a manner such that bass frequency audio signals are extracted from the input signals. The bass frequency audio signals can be further processed via at least one of linear dynamic range processing, manipulation of dynamic range via compression and manipulation of dynamic range via expansion.01-12-2012
20120008799APPARATUS AND METHOD FOR DETERMINING A PLURALITY OF LOCAL CENTER OF GRAVITY FREQUENCIES OF A SPECTRUM OF AN AUDIO SIGNAL - An apparatus for determining a plurality of local center of gravity frequencies of a spectrum of an audio signal includes an offset determiner, a frequency determiner and an iteration controller. The offset determiner determines an offset frequency for each iteration start frequency of a plurality of iteration start frequencies based on the spectrum of the audio signal, wherein a number of discrete sample values of the spectrum is larger than a number of iteration start frequencies. The frequency determiner determines a new plurality of iteration start frequencies by increasing or reducing each iteration start frequency of the plurality of iteration start frequencies by the corresponding determined offset frequency. The iteration controller provides the new plurality of iteration start frequencies to the offset determiner for further iteration or provides the plurality of local center of gravity frequencies, if a predefined termination condition is fulfilled. The plurality of local center of gravity frequencies can be utilized as a basis for generating a new plurality of iteration start frequencies.01-12-2012
20120250886CHARACTERISTIC CORRECTING DEVICE AND CHARACTERISTIC CORRECTING METHOD - According to one embodiment, a characteristic correcting device includes: a correction filter configured to correct sound quality characteristics of a plurality of bands in a frequency range of an input signal based on a frequency characteristic which is set in advance to generate an output signal; an input module configured to input a surrounding sound signal of sound around an output device outputting the output signal; and an adjusting module configured to reduce the number of the bands of which the sound quality characteristics are to be corrected of the bands in the frequency range of the input signal in accordance with an increase in amplitude of the surrounding sound signal which is input.10-04-2012
20120063615EQUALIZATION PROFILES FOR DYNAMIC EQUALIZATION OF AUDIO DATA - Apparatuses for and methods of carrying out dynamic equalization processing of an audio signal, and apparatuses for and methods of controlling such equalization processing of the audio signal to dynamically adjust the time-varying spectrum of an audio signal to more closely match a user specified target time-invariant perceived audio signal spectrum while preserving the original dynamic range of the audio signal. The dynamic equalization is carried out according to a user-defined spectral profile specified by a control interface that allows a user to define, create, modify and/or apply the user-defined spectral profile.03-15-2012
20120063614AUDIO SIGNAL DYNAMIC EQUALIZATION PROCESSING CONTROL - Apparatuses for and methods of carrying out dynamic equalization processing of an audio signal, and apparatuses for and methods of controlling such equalization processing of the audio signal to dynamically adjust the time-varying spectrum of an audio signal to more closely match a user specified target time-invariant perceived audio signal spectrum while preserving the original dynamic range of the audio signal. The dynamic equalization is according to a user-defined spectral profile specified by a control interface that allows a user to define, create, modify and/or apply the user-defined spectral profile.03-15-2012
20120128178SOUND REPRODUCING APPARATUS, SOUND REPRODUCING METHOD, AND PROGRAM - Sound reproduction is controlled so as to be heard in the optimal state for the hearing function specific to elderly people. A frequency characteristic setting portion for setting the frequency characteristics of an inputted sound signal, and a sound volume setting portion for variable controlling the volume is disclosed. The frequency characteristic setting portion changes a frequency characteristic in which a sound band including a human voice band is emphasized to a frequency characteristic in which the characteristics of a gain in accordance with a frequency gradually becomes flat with an increase in the volume set by the sound volume setting portion. As a result, the frequency band of the human voice is strongly emphasized so as to help elderly people hear it at a low volume, and, as the volume grows higher, a frequency characteristic is changed to a flatter frequency characteristic, thereby making it possible to output easy-to-hear sound while reducing inconvenience caused by the emphasis of a specific frequency band.05-24-2012
20120257769METHOD, SYSTEM AND APPARATUS FOR IMPROVING THE SONIC QUALITY OF AN AUDIO SIGNAL - A device, system and method of playing back a digital audio stream wherein large amounts of pre-emphasis of the high frequencies is applied before the digital to analog conversion and before an interpolation or digital filter, followed by de-emphasis in the analog domain in order to yield better audio fidelity.10-11-2012
20120076324SYSTEM AND METHODS FOR APPLYING BASS COMPENSATION IN AN AUTOMOBILE - Systems and methods for providing bass compensation to correct for uneven bass response are disclosed. An example bass compensation system includes a low pass filter configured to receive an audio signal from an audio source and provide a filtered audio signal, the low pass filter having a roll off of at least 18 dB per octave. The bass compensation system further includes a summing amplifier coupled to the low pass filter and configured to sum the audio signal from said audio source and the filtered audio signal to provide a summed audio signal, wherein the summed audio signal provided by the summing amplifier provides a bass boost at a first frequency and mid bass cut at a second frequency greater than the first frequency.03-29-2012
20090310799INFORMATION PROCESSING APPARATUS AND METHOD, AND PROGRAM - An information processing apparatus includes a band spreading unit configured to perform a band spreading process for generating components in a specific frequency band and adding the components to audio data, and a control unit configured to control the band spreading unit to execute the band spreading process using a band spreading method determined among a plurality of different band spreading methods, the band spreading method being defined in advance for a musical class determined using a feature of the audio data.12-17-2009
20120224719VIBRATION CONTROL - A device may include a speaker, a vibration device and logic. The speaker may be configured to output audio signals. The logic may be configured to perform audio spectrum analysis associated with the audio signals, and synchronize output of the vibration device with the audio signals output by the speaker based on the audio spectrum analysis. The vibration device may also be configured to vibrate at a number of different frequencies based on the audio spectrum analysis.09-06-2012
20110123046SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD, AND PROGRAM THEREFOR - A signal processing apparatus includes: a separation processing unit that generates observed signals in the time frequency domain by performing the short-time Fourier transform on mixed signals as outputs, which are acquired from a plurality of sound sources by a plurality of sensors, and generates sound source separation results corresponding to the sound sources by a linear filtering process on the observed signals. The separation processing unit has a linear filtering process section that performs the linear filtering process on the observed signals so as to generate separated signals corresponding to the respective sound sources, an all-null spatial filtering section that applies an all-null spatial filter to generate signals filtered with the all-null spatial filter (spatially filtered signals) in which the acquired sounds in null directions are removed, and a frequency filtering section that performs a filtering process by inputting the separated signals and the spatially filtered signals.05-26-2011
20120281859APPARATUS AND METHOD FOR GENERATING A HIGH FREQUENCY AUDIO SIGNAL USING ADAPTIVE OVERSAMPLING - An apparatus for generating a high frequency audio signal that includes an analyzer for analyzing an input signal to determine a transient information adaptively. Additionally a spectral converter is provided for converting the input signal into an input spectral representation. A spectral processor processes the input spectral representation to generate a processed spectral representation including values for higher frequencies than the input spectral representation. A time converter is configured for converting the processed spectral representation to a time representation, wherein the spectral converter or the time converter are controllable to perform a frequency domain oversampling for the first portion of the input signal having the transient information associated and to not perform the frequency domain oversampling for the second portion of the input signal not having the associated transient information.11-08-2012
20120328124Processing of Audio Signals During High Frequency Reconstruction - The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.12-27-2012
20120328123SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD, AND PROGRAM - Provided is a signal processing apparatus, including a filter unit that filters an audio signal created by decimating a portion of frequency components by an all-pass filter and outputs a filtering result thereof as improvement components to improve sound quality of the audio signal, and an adder that generates an improved sound in which the sound quality of the audio signal is improved by adding the improvement components to the audio signal.12-27-2012
20120288118CONTROL OF A LOUDSPEAKER OUTPUT - A method of modeling the frequency-dependent input-voltage-to-excursion transfer function of a loudspeaker, comprises, for a plurality of measurement frequencies, measuring a voltage and current and deriving an impedance at the measurement frequency. A frequency-dependent impedance function is derived.11-15-2012
20100202629SOUND REPRODUCTION SYSTEMS - A sound reproduction system includes an electro-acoustic transducer and a transducer driver for driving the electro-acoustic transducer. The transducer drive includes a filter which is configured to reproduce at a listener's location an approximation to the local sound field that would be present at the listener's ears in recording space, taking into account the characteristics and intended position of the electro-acoustic transducer relative to the listener's ears. The electro-acoustic transducer includes a first sound emitter which provides an intermediate sound emission channel, and second and third sound emitters providing respective left and right sound emission channels. The first sound emitter is located intermediate of second and third sound emitters. Higher frequencies from at least one of the second and third sound emitters are transmitted closer to the first sound emitter while lower frequencies are transmitted away from the first sound emitter.08-12-2010
20130016856AUDIO DEVICEAANM Koike; HiroyukiAACI KanagawaAACO JPAAGP Koike; Hiroyuki Kanagawa JP - Disclosed is an audio device that plays back compressed audio signals that can be sufficiently comfortable to be audible even in a play back environment with improved acoustic quality. In order to correct a weak signal component near a frequency with a high output level of a compressed audio, weak-signal component adding unit (01-17-2013
20120243708Modulation of Audio Signals in a Parametric Speaker - Methods and systems for amplitude modulation in a parametric speaker system are provided that perform truncated double sideband (TDSB) frequency modulation of audio signal in which most of the processing is performed in the frequency domain, thus permitting use of fast processing techniques for amplitude modulation (AM) and filtering and reducing computation cost over time domain processing. A maximum envelope value of the time domain audio signal may be to the carrier signal in the frequency domain that avoids emitting the carrier signal when the input signal level is low or mute. The application of the envelope value may be smoothed to reduce discontinuity at input block boundaries.09-27-2012
20130177170INTELLIGENT METHOD AND APPARATUS FOR SPECTRAL EXPANSION OF AN INPUT SIGNAL - A method, and a corresponding apparatus, for processing an input signal comprise filtering the input signal to separate a passband frequency component of the input signal from a stopband frequency component of the input signal, and adjusting relative signal power values of the passband frequency component and the stopband frequency component of the input signal based at least in part on signal values of a number of samples associated with the input signal. In the case of audio signals, for example, such processing is used for spectral expansion of the input signal by enhancing the power of the stopband, or low and high frequencies, component with respect to the power of the passband component of the input signal. As a result, a better audio quality is achieved.07-11-2013
20130177171PSEUDO BASS GENERATING APPARATUS - A pseudo bass generating apparatus includes a first 407-11-2013
20130177172CABLE CONNECTOR HAVING HIGH RESOLUTION ADJUSTABLE CAPACITANCE AND METHOD FOR USING THE SAME - A cable connector configured to receive a sound signal and alter the tonality of the sound by switching among a plurality of capacitors. The cable connector comprises a switch coupled to a binary coded plurality of capacitors. The cable connector receives an input signal corresponding to a sound through a conductor, which is also coupled to the switch. The switch may be used to select one of a plurality of capacitances, affecting the tonality of the sound. A cable implementing the cable connector and a method for using the cable connector are also disclosed.07-11-2013
20130170667CLOCK REGENERATION CIRCUIT AND DIGITAL AUDIO REPRODUCTION DEVICE - A frequency detection circuit of a clock regeneration circuit measures time which an input clock takes to change a predetermined number of times, and outputs a count value proportional to the time. A division ratio generation circuit truncates bits of the output of the frequency detection circuit by using a quantizer, and outputs the obtained value as a division ratio. A variable frequency divider divides a master clock by the division ratio output from the division ratio generation circuit, and outputs the obtained clock as a new clock. A high-quality clock having reduced jitter is regenerated, so that audio reproduction with high-quality sound is possible.07-04-2013
20110274292ACOUSTIC CHARACTERISTIC CORRECTION COEFFICIENT CALCULATION APPARATUS, ACOUSTIC CHARACTERISTIC CORRECTION COEFFICIENT CALCULATION METHOD AND ACOUSTIC CHARACTERISTIC CORRECTION APPARATUS - According to one embodiment, an acoustic characteristic correction coefficient calculation apparatus includes a frequency converter, a smoother, a frequency inverter, a cutter, and a calculator. The frequency converter is configured to convert a first impulse response corresponding to an input acoustic signal to a frequency domain. The smoother is configured to smooth amplitude and phase corresponding to the frequency domain converted by the frequency converter. The frequency inverter is configured to convert a frequency characteristic smoothed by the smoother to a time domain. The cutter is configured to cut out a second impulse response configured by the time domain obtained by converting the frequency characteristic by use of the frequency inverter by a preset tap number. The calculator is configured to calculate a correction coefficient used to correct an acoustic characteristic based on a result cut out by the cutter.11-10-2011
20130142359SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD - A signal processing apparatus includes: a control section; a signal processing section connected with a plurality of signal processing elements and configured to perform signal processing for enhancing or attenuating an input signal in a specific frequency band; and a crossfade signal section including a crossfade signal processing element capable of replacing at least one of the signal processing elements, wherein the control section is configured to control any one of the signal processing elements among the plurality of signal processing elements, and the crossfade signal processing element, to crossfade to the crossfade signal processing element having the signal processing element as a new characteristic, to perform processing for replacing any one of the signal processing elements by the crossfade signal processing element, and to perform the processing on remaining signal processing elements of the plurality of signal processing elements in the signal processing section.06-06-2013
20130142360METHOD AND SYSTEM FOR CONTROLLING DISTORTION IN A CRITICAL FREQUENCY BAND OF AN AUDIO SIGNAL - In some embodiments, a method and system for controlling distortion of the output of a miniature speaker by attenuating critical frequency band of the input signal to be reproduced, using tuning parameters that have been predetermined where the critical frequency band is a frequency range of the speaker's frequency response in which Total Harmonic Distortion (THD) peaks. The distortion control is performed in a manner which allows an increase in the average loudness of the speaker's output without significantly increasing distortion. The tuning parameters include a center frequency and a bandwidth of the critical frequency band, and a power threshold value. In some embodiments, the system is a loudness maximizer configured to limit distortion of a speaker's output by limiting distortion in a critical frequency band using predetermined control parameters, and limit the dynamic range of the output signal and increase its perceived overall average loudness level.06-06-2013
20130114831METHODS AND APPARATUS TO PERFORM AUDIO WATERMARKING AND WATERMARK DETECTION AND EXTRACTION - Encoding and decoding methods and apparatus as described. An example method of obtaining auxiliary information in an audio signal using a plurality of frequency components residing in a plurality of code bands comprises transforming an audio signal into a frequency domain representation; determining characteristic of frequencies of the frequency domain representation that may contain the auxiliary information; normalizing across the code bands the characteristics of frequencies of the frequency domain representation in a respective one of the code bands that may contain the auxiliary information, wherein the normalization is carried out against a characteristic of a frequency in that code band; summing the normalized characteristics of the frequencies representative of auxiliary information to determine a sum for a frequency representative of auxiliary information; and determining that the sum is representative of the auxiliary information.05-09-2013
20130114830DETERMINING A CONFIGURATION FOR AN AUDIO PROCESSING OPERATION - A computer-implemented method of determining a configuration for an audio processing operation, wherein the audio processing operation comprises a predetermined set of one or more audio processing sub-operations, each audio processing sub-operation being configurable with one or more respective configuration parameters, the method comprising: specifying the predetermined set of one or more audio processing sub-operations; specifying a target frequency response; and performing a convergent optimization process to determine a configuration for the audio processing operation that reduces a difference between the frequency response of the audio processing operation and the target frequency response, wherein the configuration comprises a respective value for each configuration parameter of each audio processing sub-operation.05-09-2013
20130094665DEVICE AND METHOD FOR REPRODUCING AN AUDIO SIGNAL - A device and method for controlling reproduction of an audio signal is provided, wherein the device is operated by means of an energy storage device. The method comprises the steps of deactivating a normal mode and activating an energy saving mode. Power consumption from the energy storage device for reproduction of the audio signal is reduced in the energy saving mode when compared to the normal mode. The method comprises reducing in the energy saving mode, a bass frequency component of a frequency spectrum of the audio signal and outputting the audio signal with reduced bass frequency component. The method further comprises ascertaining a charge state of the energy storage device and controlling the reduction in the bass frequency component based on a decrease in the charge state of the energy storage device.04-18-2013
20130114829Recursive audio modulation system using nested inductor arrays - Nested inductor arrays magnetically modulate an analog audio input signal recursively, so that the overall amplitude envelope of the output signal replicates the wave pattern of the input signal. The nested inductor arrays produce multiple levels of recursive modulation, so that the output signal incorporates multiple integrated self-similar harmonic layers, such that the phasing of the various layers are locked in by the analog waveform of the output signal itself. As a result, the spatial “depth” and temporal “immediacy” of the original analog recording is restored and can be encoded in digital format.05-09-2013
20130121508Non-Speech Content for Low Rate CELP Decoder - A method and device for modifying a synthesis of a time-domain excitation decoded by a time-domain decoder, wherein the synthesis of the decoded time-domain excitation is classified into one of a number of categories. The decoded time-domain excitation is converted into a frequency-domain excitation, and the frequency-domain excitation is modified as a function of the category in which the synthesis of the decoded time-domain excitation is classified. The modified frequency-domain excitation is converted into a modified time-domain excitation, and a synthesis filter is supplied with the modified time-domain excitation to produce a modified synthesis of the decoded time-domain excitation.05-16-2013
20130121507SYSTEM AND METHOD FOR DIGITAL SIGNAL PROCESSING - The present invention provides methods and systems for digitally processing audio signals. Some embodiments receive an audio signal and converting it to a digital signal. The gain of the digital signal may be adjusted a first time, using a digital processing device located between a receiver and a driver circuit. The adjusted signal can be filtered with a first low shelf filter. The systems and methods may compress the filtered signal with a first compressor, process the signal with a graphic equalizer, and compress the processed signal with a second compressor. The gain of the compressed signal can be adjusted a second time. These may be done using the digital processing device. The signal may then be output through an amplifier and driver circuit to drive a personal audio listening device. In some embodiments, the systems and methods described herein may be part of the personal audio listening device.05-16-2013
20130129114CLOCK GENERATOR - A clock generator receives first and second clock signals, and input representing a desired frequency ratio. A comparison is made between frequencies of an output clock signal and the first clock signal, and a first error signal represents the difference between the desired frequency ratio and this comparison result. The first error signal is filtered. A comparison is made between frequencies of the output clock signal and the second clock signal, and a second error signal represents the difference between the filtered first error signal and this comparison result. The second error signal is filtered. A numerically controlled oscillator receives the filtered second error signal and generates an output clock signal. As a result, the output clock signal has the jitter characteristics of the first input clock signal over a useful range of jitter frequencies and the frequency accuracy of the second input clock signal.05-23-2013
20130156225SYSTEM AND METHODS FOR APPLYING BASS COMPENSATION - Systems and methods for providing bass compensation to correct for uneven bass response are disclosed. An example bass compensation system includes a low pass filter configured to receive an audio signal from an audio source and provide a filtered audio signal, the low pass filter having a roll off of at least 18 dB per octave. The bass compensation system further includes a summing amplifier coupled to the low pass filter and configured to sum the audio signal from said audio source and the filtered audio signal to provide a summed audio signal, wherein the summed audio signal provided by the summing amplifier provides a bass boost at a first frequency and mid bass cut at a second frequency greater than the first frequency.06-20-2013
20120020496Fast Acoustic Cancellation - A speech enhancement system improves the perceptual quality of an aural signal. A receiver detects and receives an unvoiced signal, a fully voiced signal, or a mixed voice remote signal. A coherence processor identifies the similarities or differences between a local signal and the remote signal. A cancellation processor or controller dampens reflected signals that may be part of the local signal.01-26-2012
20130195287DIGITAL EQUALIZING FILTERS WITH FIXED PHASE RESPONSE - An equalization filter structure for filtering an audio signal within an audio system is disclosed. The equalization filter comprises a first and a second shelving filter each having a fixed first and a fixed second phase response, each of which is determined by a respective cut-off frequency and Q factor which represent the transfer characteristic of the corresponding shelving filter. The first and the second shelving filters are coupled in series and each shelving filter comprises at least one fourth order low-pass filter having a cut-off frequency, a Q factor and a first broadband gain and further at least one fourth order high-pass filter having a second broadband gain and the same cut-off frequency and the same Q factor as the low-pass filter. The fourth order low-pass filter and the fourth order high-pass filter are connected in parallel, such that both filters receive the same input signal and the corresponding filtered signals are summed to form a respective shelving filter output signal. Each fourth order low-pass and high-pass filter is composed of a cascade of two second order low-pass or high-pass filters, respectively, and each second order filter has the same cut-off frequency and Q factor as the corresponding shelving filter.08-01-2013
20120294460SOUND PROCESSING APPARATUS AND PARAMETER SETTING METHOD - A sound processing apparatus includes a processing unit that is configured to acquire an audio signal, perform a correction processing on the acquired audio signal and output the correction-processed audio signal to a sound emitting unit. The correction processing includes an indirect sound adjusting processing in which a given signal processing is performed on an audio signal so as to adjust an influence of an indirect sound to be heard at a sound receiving point, and a frequency characteristic adjusting processing in which a frequency characteristic of an audio signal is adjusted. In the correction processing, a frequency characteristic for the frequency characteristic adjusting processing is determined based on a frequency characteristic of the indirect sound adjusting processing.11-22-2012
20120294459Audio System and Method of Using Adaptive Intelligence to Distinguish Information Content of Audio Signals in Consumer Audio and Control Signal Processing Function - A consumer audio system has a signal processor coupled for receiving an audio signal. The audio signal is sampled into a plurality of frames. The sampled audio frames are separated into sub-frames according to the type or frequency content of the sound generating source. A time domain processor generates time domain parameters from the separated sub-frames. A frequency domain processor generates frequency domain parameters from the separated sub-frames. The time domain processor or frequency domain processor can detects onset of a note of the audio signal. A signature database has signature records each having time domain parameters and frequency domain parameters and control parameters. A recognition detector matches the time domain parameters and frequency domain parameters of the separated sub-frames to a signature record of the signature database. The control parameters of the matching signature record control operation of the signal processor.11-22-2012
20120294458SEMICONDUCTOR INTEGRATED CIRCUIT OF CAR NAVIGATION SYSTEM AND MULTIMEDIA PROCESSING METHOD APPLIED TO CAR NAVIGATION SYSTEM INTEGRATED WITH FM/AM BROADCAST RECEIVING FUNCTION - A semiconductor IC includes an analog audio input circuit, a selecting unit, and an audio processing circuit, which maybe a car navigation chip. The analog audio input circuit includes an RF module and at least one analog audio input module, respectively for providing a first analog audio input signal and at least one second analog audio input signal. The RF module includes an FM/AM broadcast receiving function. The selecting unit is coupled to the RF module and analog audio input module, and outputs a target analog audio input signal according to the first and second analog audio input signals. The audio processing circuit is coupled to the selecting unit, and performs an audio signal process upon the target analog audio signal to generate an audio output signal.11-22-2012
20120294457Audio System and Method of Using Adaptive Intelligence to Distinguish Information Content of Audio Signals and Control Signal Processing Function - An audio system has a signal processor coupled for receiving an audio signal from a musical instrument or vocals. A time domain processor receives the audio signal and generates time domain parameters of the audio signal. A frequency domain processor receives the audio signal and generates frequency domain parameters of the audio signal. The audio signal is sampled and the time domain processor and frequency domain processor operate on a plurality of frames of the sampled audio signal. The time domain processor detects onset of a note of the sampled audio signal. A signature database has signature records each having time domain parameters and frequency domain parameters and control parameters. A recognition detector matches the time domain parameters and frequency domain parameters of the audio signal to a signature record of the signature database. The control parameters of the matching signature record control operation of the signal processor.11-22-2012
20130208915SYSTEM AND METHOD FOR A PCM INTERFACE FOR A CAPACITIVE SIGNAL SOURCE - In accordance with embodiment, a method includes amplifying signal provided by a microphone to form an amplified signal. The method also includes converting the amplified signal into a frequency-based signal having a frequency dependent on an amplitude of the amplified signal. The frequency-based signal is converted into a pulse code modulated bitstream.08-15-2013
20130208916MULTICHANNEL SPEAKER ENCLOSURE - The invention relates to a speaker enclosure comprising at least two channels, wherein a first and second channel are respectively dedicated to separate and adjacent first and second frequency bands, each of said channels including a filtering stage supplied by the control signal and a speaker unit, wherein said speaker enclosure is characterized in that said channels also include means for simultaneously: disconnecting the first channel from the control signal; and modifying the filtering stage of the second channel so as to modify the frequency response thereof.08-15-2013

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