With Amplitude Compression/expansion Patents (Class 381/106)
  • Publication number: 20120014536
    Abstract: An electronic device includes an amplifier, an output unit, a processing unit, and a mute control circuit. The amplifier is for amplifying audio signals and generating amplified audio signals accordingly. The amplifier includes an output port to output the amplified audio signals. The output unit is for emitting sounds corresponding to the amplified audio signals. The processing unit is for generating a mute control signal. The mute control circuit includes a main circuit and an auxiliary circuit. The main circuit is for responding to the mute control signal, and for driving the amplifier to change between a mute state and a play state accordingly. The auxiliary circuit is for enabling the output port of the amplifier to be electrically grounded at the moment of supplying power to the electronic device.
    Type: Application
    Filed: August 25, 2010
    Publication date: January 19, 2012
    Applicants: HON HAI PRECISION INDUSTRY CO., LTD., HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD .
    Inventor: TAO WANG
  • Patent number: 8090120
    Abstract: The invention relates to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal. An audio signal is modified in response to calculations performed at least in part in the perceptual (psychoacoustic) loudness domain. The invention is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for background noise interference in an audio playback environment. The invention includes not only methods but also corresponding computer programs and apparatus.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: January 3, 2012
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan Jeffrey Seefeldt
  • Patent number: 8085941
    Abstract: A dynamic range manipulation system, for use for example in an audio playback system such as a two-way communication system, mobile telephone, MP3 player, and the like, obtains a measure of ambient noise at the playback location and adjusts the gain of the drive signal provided to the loudspeaker based on this measure and based on the audio signal to be played back.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: December 27, 2011
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Jon C. Taenzer
  • Patent number: 8085953
    Abstract: An audio-signal time-axis expansion/compression method for subjecting an audio signal to time-axis expansion/compression at a time domain includes the steps of: cross-fade-signal generating wherein a first period and a second period which are similar within the audio signal are employed to generate the cross-fade signal of the first period signal and the second period signal; correction-signal generating wherein the difference signal between the first period signal and the second period signal is subjected to time-axis reversal, and is multiplied with a window function to generate a correction signal; and connection-waveform generating wherein the cross-fade signal and the correction signal are added to generate a connection waveform for subjecting the audio signal to time-axis expansion/compression at the time domain.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: December 27, 2011
    Assignee: Sony Corporation
    Inventors: Osamu Nakanura, Mototsugu Abe, Masayuki Nishiguchi
  • Patent number: 8082157
    Abstract: A method and/or apparatus for encoding and/or decoding an audio signal is disclosed, in which a downmix gain is applied to a downmix signal in an encoding apparatus which, in turn, transmits, to a decoding apparatus, a bit stream containing information as to the applied downmix gain. The decoding apparatus recovers the downmix signal, using the downmix gain information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the encoding apparatus can apply an arbitrary downmix gain (ADG) to the downmix signal, and can transmit a bit stream containing information as to the applied ADG to the decoding apparatus. The decoding apparatus recovers the downmix signal, using the ADG information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the method and/or apparatus can also vary the energy level of a specific channel, and can recover the varied energy level.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: December 20, 2011
    Assignee: LG Electronics Inc.
    Inventors: Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim, Yang Won Jung, Sung Young Yoon
  • Patent number: 8077474
    Abstract: A variable equalizer apparatus for forward and/or reverse equalizers in an amplifier. The system can include a structure to allow continuous contact of the signal flow as an equalizer is removed; jumpers with fixed resistors and associated capacitors and inductors to produce a variable range over many different values; and/or variable resistance potentiometers with fixed resistors and associated capacitors and inductors to produce a variable range over separate value equalizers.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: December 13, 2011
    Inventors: Edward Perez, David Wallis
  • Patent number: 8073702
    Abstract: A method and/or apparatus for encoding and/or decoding an audio signal is disclosed, in which a downmix gain is applied to a downmix signal in an encoding apparatus which, in turn, transmits, to a decoding apparatus, a bitstream containing information as to the applied downmix gain. The decoding apparatus recovers the downmix signal, using the downmix gain information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the encoding apparatus can apply an arbitrary downmix gain (ADG) to the downmix signal, and can transmit a bitstream containing information as to the applied ADG to the decoding apparatus. The decoding apparatus recovers the downmix signal, using the ADG information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the method and/or apparatus can also vary the energy level of a specific channel, and can recover the varied energy level.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: December 6, 2011
    Assignee: LG Electronics Inc.
    Inventors: Hee Suk Pang, Hyen O Oh, Dong Soo Kim, Jae Hyun Lim, Yang Won Jung, Sung Young Yoon
  • Patent number: 8059832
    Abstract: When an inputted audio signal is outputted from a speaker device having a predetermined input-output characteristic, the predetermined input-output characteristic being selected such that the linearity of an output level with respect to an input signal is approximately assured at a level equal to a predetermined level or more and the output level with respect to the input signal is lowered at a level equal to the predetermined level or less, a correction process for compensating a lowered output level is carried out with respect to a signal component approximately of a level equal to the predetermined level or less in the inputted audio signal. Owing to the correction process, the reproduction characteristic of a small volume signal from a speaker is improved.
    Type: Grant
    Filed: December 1, 2005
    Date of Patent: November 15, 2011
    Assignee: Sony Corporation
    Inventor: Shinji Kobayashi
  • Patent number: 8054994
    Abstract: A request is received to play an audio file. A determination is made regarding whether volume normalization parameters associated with the audio file are stored in a media library. If the volume normalization parameters associated with the audio file are stored in the media library, the volume normalization parameters are retrieved from the media library. If the volume normalization parameters associated with the audio file are not stored in the media library, retrieving the volume normalization parameters from the audio file. The volume normalization parameters are applied while playing the audio file. The volume normalization process can be applied across multiple audio files during playback.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: November 8, 2011
    Assignee: Microsoft Corporation
    Inventors: Phillip Lu, Adil Sherwani, Kipley J. Olson
  • Patent number: 8050412
    Abstract: A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value and a left channel signal value. A DSP (60) recursively finds a preferred coefficient value for a scaling that reduces stereo separation due to amplitude variation of the right and left channel signal values. The preferred coefficient value is thereafter used for scaling the right and left channel signal values.
    Type: Grant
    Filed: December 14, 2004
    Date of Patent: November 1, 2011
    Assignee: Broadcom Corporation
    Inventor: David Chaohua Wu
  • Patent number: 8045739
    Abstract: In a method and hearing aid (200) for processing sound signals for hearing impaired persons by providing multi-band compression processing an input sound signal is filtered by a band split filter (202) into a number of frequency bands to obtain band split signals. A signal level for each of the band split signals is determined and the frequency bands are arranged into a number of groups. Based on the signal levels in each of the groups, a compressor input level for a number of band split compressors each associated to one of the frequency bands is calculated. A compressor gain for each band split compressor is determined based on the corresponding compressor input signal and the band split signals are amplified with the corresponding compressor gain and summed in a summing unit (208) to produce an output sound signal.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: October 25, 2011
    Assignee: Widex A/S
    Inventors: Carsten Paludan-Mueller, Carl Ludvigsen, Anne Vikar Damsgaard
  • Patent number: 8036402
    Abstract: A distortion compensation system minimizes distortion in an audio system by monitoring a supply voltage and adjusting a clipping threshold and/or compression knee. An adjustable gain circuit controls the gain of the audio signal according whether the audio signal exceeds a variable threshold. The variable threshold is adjusted within a threshold range based on the supply voltage. Distortion due to clipping of the audio signal is minimized while available power at any given time is maximized.
    Type: Grant
    Filed: December 15, 2005
    Date of Patent: October 11, 2011
    Assignee: Harman International Industries, Incorporated
    Inventor: Kenneth Carl Furge
  • Patent number: 8032385
    Abstract: A coded signal conveys encoded audio information and metadata that may be used to control the loudness of the audio information during its playback. If the values for these metadata parameters are set incorrectly, annoying fluctuations in loudness during playback can result. The present invention overcomes this problem by detecting incorrect metadata parameter values in the signal and replacing the incorrect values with corrected values.
    Type: Grant
    Filed: September 24, 2009
    Date of Patent: October 4, 2011
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Michael John Smithers, Jeffrey Charles Riedmiller, Charles Quito Robinson, Brett Graham Crockett
  • Patent number: 8027645
    Abstract: A method for automatically tuning a frequency modulator in a mobile device is described. A frequency band is automatically scanned using a frequency modulation (FM) receiver. The FM receiver is integrated as a part of the mobile device. Quality associated with channels of the frequency band is analyzed to identify at least one available channel at a first frequency. The first frequency is assigned to an FM modulator. The FM modulator is integrated as a part of the mobile device. A determination is made whether a command to scan for a second frequency is received. If the command to scan for the second frequency is not received, a signal on the first frequency is transmitted by the FM modulator.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: September 27, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Houman Haghighi, Victoria Ann Smith
  • Patent number: 8019095
    Abstract: Scaling, by a desired amount sm, the overall perceived loudness Lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power P, by scaling the perceived loudness of each individual channel Lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power. Optionally, in addition, the loudness scaling applied to each channel may be modified so as to reduce the difference between the actual overall loudness scaling and the desired amount of overall loudness scaling.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: September 13, 2011
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alan Jeffrey Seefeldt, Michael John Smithers
  • Patent number: 8019105
    Abstract: A hearing aid includes a microphone for conversion of sound into an input audiosignal, a signal processor for processing the input audiosignal, the signal processor including a compressor, and a receiver for conversion of the processed signal into sound, wherein the compressor is configured to adapt attack and release time constants in response to input signal fluctuations.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: September 13, 2011
    Assignee: GN Resound A/S
    Inventor: James Mitchell Kates
  • Patent number: 8014534
    Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
    Type: Grant
    Filed: September 27, 2005
    Date of Patent: September 6, 2011
    Assignee: Coding Technologies AB
    Inventors: Fredrik Henn, Kristofer Kjorling, Lars Liljeryd, Jonas Roden, Jonas Engdegard
  • Patent number: 8014999
    Abstract: The invention provides a softscaled frequency compensation function that allows the evaluation of a first quality measure indicating a global impact of all distortions in an audio transmission system, including linear frequency response distortions and second quality measure that only lakes into account the impact of linear frequency response distortions. The softscaled frequency compensation function is derived from a softscaled ratio between a time integrated output and a time integrated input power density functions. The first quality measure is derived from the difference loudness density function as function of time and frequency, using the frequency compensated input loudness density function and the gain compensated output loudness density function both as a function of time and frequency, in the same manner as carried out in ITU standard P.862.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: September 6, 2011
    Assignee: Nederlandse Organisatie voor toegepast - natuurwetenschappelijk Onderzoek TNO
    Inventor: John Gerard Beerends
  • Patent number: 8014541
    Abstract: A system and method for graphic equalization of audio signals is disclosed. Traditional graphic equalizers provide control over the gains in each of a set of frequency bands. However, the actual band gains vary from the desired gains due to crosstalk between bands. Prior art methods for addressing this difficulty include applying a correction filter to the equalizer, and adjusting the shape of the individual band filters, both of which increase the computational cost. In an embodiment of the present invention, the input gains are processed to produce a set of adjusted gains which take into account the crosstalk, and result in an equalization interpolating the input band gains.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: September 6, 2011
    Assignee: Kind of Loud Technologies, LLC.
    Inventors: Jonathan S. Abel, David P. Berners
  • Patent number: 8000968
    Abstract: A method and an apparatus for switching speech or audio signals, wherein the method for switching speech or audio signals includes when switching of a speech or audio, weighting a first high frequency band signal of a current frame of speech or audio signal and a second high frequency band signal of the previous M frame of speech or audio signals to obtain a processed first high frequency band signal, where M is greater than or equal to 1, and synthesizing the processed first high frequency band signal and a first low frequency band signal of the current frame of speech or audio signal into a wide frequency band signal. In this way, speech or audio signals with different bandwidths can be smoothly switched, thus improving the quality of audio signals received by a user.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: August 16, 2011
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zexin Liu, Lei Miao, Chan Hu, Wenhai Wu, Yue Lang, Qing Zhang
  • Patent number: 7983430
    Abstract: A control system comprising a computing device, a memory device comprising a database, and a plurality of audio sources. The memory device is coupled to the computing device. The database comprises input data. The computing device is adapted to control an audio level for each of said audio sources in response to said input data to resolve audio conflicts between the audio sources.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: July 19, 2011
    Assignee: International Business Machines Corporation
    Inventors: Gregory J. Boss, Carl P. Gusler, Rick A. Hamilton, II, James W. Seaman
  • Patent number: 7970153
    Abstract: An audio output apparatus has a measuring circuit which measures the levels of at least two sound signals, a sound level adjusting module (a sound level adjusting circuit and a gain control circuit) which adjusts a sound level so as to equal the levels of the sound signals based on the levels measured at the measuring circuit, and an array speaker unit (a delay circuit, a multiplier, an adder, an amplifier and a speaker unit) which emits sounds in accordance with the sound signals outputted from the sound level adjusting module in different directivities respectively.
    Type: Grant
    Filed: December 24, 2004
    Date of Patent: June 28, 2011
    Assignee: Yamaha Corporation
    Inventors: Yusuke Konagai, Susumu Takumai
  • Patent number: 7961896
    Abstract: Systems for an expander circuit are disclosed. An expander circuit comprising a transmit amplifier for amplifying electrical signals received from a microphone. A rectifier circuit is responsive to the electrical signals and generates a D.C. voltage. A dynamic resistor circuit is coupled to the transmit amplifier for regulating the gain of the transmit amplifier. The dynamic resistor circuit includes a bipolar junction transistor for receiving the D.C. voltage. The bipolar junction transistor is operated such that the collector current is zero and the bipolar junction transistor has a variable impedance seen by the transmit amplifier dependent upon the D.C. voltage.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: June 14, 2011
    Assignee: Plantronics, Inc.
    Inventor: Ching Shyu
  • Patent number: 7945058
    Abstract: A noise reduction system is used in a BTSC system to reduce noise of an audio signal. The noise reduction system has an audio spectral compressing unit that has a filter and a memory in the approach of the digital processing. The filter is arranged to filter an input signal according to a transfer function, a variable d, and several parameters b0/a0, a0/b0, b1/b0 and a1/a0. The memory is arranged to store the parameters.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: May 17, 2011
    Assignee: Himax Technologies Limited
    Inventors: Kai-Ting Lee, Tien-Ju Tsai
  • Patent number: 7929714
    Abstract: An integrated audio transducer with associated signal processing electronics is disclosed. A silicon audio transducer, such as a MEMS microphone or speaker, can be integrated with audio processing electronics in a single package. The audio processing electronics can be configured using control signals. The audio processing electronics can provide a single line serial data interface and a single line control interface. The audio transducers can be integrated with associated processing electronics. A silicon microphone can be integrated with an Analog to Digital Converter (ADC). The ADC output can be a single line serial interface. The ADC can be configured using a single line serial control interface. A speaker may be integrated with a Digital to Analog Converter (DAC). Audio transducers can also be integrated with more complex processing electronics. Audio processing parameters such as gain, dynamic range, and filter characteristics may be configured using the serial interface.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: April 19, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Seyfollah Bazarjani, Louis D. Oliveira
  • Patent number: 7912226
    Abstract: Automatic measurements are made of audio presence and level in an audio signal by direct processing of an MPEG data stream representing the audio signal, without reconstructing the audio signal. Sub-band data is extracted from the data stream, and the extracted sub-band data is dequantized and denormalized. An audio level for the dequantized and denormalized sub-band data is measured without reconstructing the audio signal. Channel characteristics are used in measuring the audio level of the sub-band data, wherein the channel characteristics are used to weight the measured levels. The measured levels are compared against at least one threshold to determine whether an alarm should be triggered.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: March 22, 2011
    Assignee: The DIRECTV Group, Inc.
    Inventors: Thomas H. James, Jeffrey D. Carpenter
  • Patent number: 7903825
    Abstract: A personal audio playback device having gain control responsive to environmental sounds provides for improved enjoyment of program material played back through headphones, while further providing features for personal safety and communications with others. A microphone is incorporated on the surface of the playback device, which includes an audio output connection for headphones and internal storage for audio program material. The entire device may be incorporated within the headphones, or the headphones may connect through a connector on the housing of the device. The gain, type or position of the program material is controlled in conformity with a detected characteristic of ambient sounds received by the microphone, which may be the amplitude of the signals in one or more frequency bands, or a particular type of sound, such as speech or vehicular sounds. Multiple modes are selectable for processing the audio, selecting program material type and/or re-positioning the program material.
    Type: Grant
    Filed: March 3, 2006
    Date of Patent: March 8, 2011
    Assignee: Cirrus Logic, Inc.
    Inventor: John L. Melanson
  • Patent number: 7894614
    Abstract: A system and method for achieving extended low-frequency response and increased low-frequency sound pressure output capability in a loudspeaker system is provided. The system and method comprise mounting a low-frequency driver in a ported box, tuning the ported box to a sufficiently low frequency so as to result in a frequency response that can be modeled substantially as a second-order response, and equalizing the response of said driver-box combination with a second-order biquadratic filter function to achieve the desired frequency response characteristic.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: February 22, 2011
    Inventor: Robert Roger Cordell
  • Patent number: 7856108
    Abstract: The present invention relates to a method for preventing an output device from being damaged, which comprises the steps of: dividing the output value of an output device into a plurality of areas, defining a ratio value to every area, receiving a desired output value, determining the current area where the desired output value device is located, and calculating the desired output value with the ratio value to obtain an actual output volume and output the actual output volume.
    Type: Grant
    Filed: December 7, 2005
    Date of Patent: December 21, 2010
    Assignee: Compal Electronics, Inc.
    Inventors: Yi-Wei Chiu, Cheng-I Chien
  • Publication number: 20100266144
    Abstract: An audio processing chip includes a connecting port, an audio amplifier module and a pulse width modulation (PWM) control circuit. The connecting port receives a pulse width modulation (PWM) signal; the audio amplifier module amplifies an audio signal according to a control signal to thereby output an audio output signal; and the pulse width modulation (PWM) control circuit is coupled between the connecting port and the audio amplifier module, and outputs the control signal to the audio amplifier module according to the PWM signal to thereby control an operation of the audio amplifier module.
    Type: Application
    Filed: April 8, 2010
    Publication date: October 21, 2010
    Inventors: Sheng-Nan Chiu, Ching-Hsian Liao, Po-Chiang Wu
  • Publication number: 20100254546
    Abstract: A signal processing device includes: a frequency conversion processing unit that sets, as a processing target signal, a section in which a peak signal level exceeds a first threshold in an input sound signal and applies frequency conversion processing to the processing target signal to acquire power levels in respective plural bands; and an amplitude compressing unit that executes, when a power level exceeding a second threshold is present among the power levels in the respective plural bands acquired by the frequency conversion processing unit, amplitude compression processing for compressing a signal level of the processing target signal at a compression ratio at which the peak signal level of the processing target signal falls within the first threshold and, otherwise, prohibits the execution of the amplitude compression processing.
    Type: Application
    Filed: February 5, 2010
    Publication date: October 7, 2010
    Applicant: SONY CORPORATION
    Inventor: Okifumi HOSOMI
  • Publication number: 20100246853
    Abstract: An audio signal processing apparatus includes: a first filtering unit which outputs an audio signal while attenuating frequency components except for preset frequency components; a detecting unit which detects a sound volume level; an amplitude limiting unit which calculates an amplitude limiting level corresponding to the sound volume level, and which limits a part of a waveform of the audio signal output from the first filtering unit; a second filtering unit which outputs the audio signal output from the amplitude limiting unit while attenuating frequency components except for preset frequency components including a part of the frequency band of the audio signal output from the first filtering unit, and a part of the frequency band of the harmonics; a compressing unit which compresses a dynamic range of the audio signal; and an adding unit which adds the audio signal output from the compressing unit to the input audio signal.
    Type: Application
    Filed: February 25, 2010
    Publication date: September 30, 2010
    Applicant: Yamaha Corporation
    Inventor: Ryotaro AOKI
  • Patent number: 7805296
    Abstract: An audio data processing device including: a first processor; and a second processor which is connected to the first processor wherein the first processor includes: an audio data acquisition which acquires audio data of digital data; an omitting section which omits a bit corresponding to low volume which is hard to be heard by human ears from the audio data; and a transmitter which transmits the audio data in which the bit corresponding to the low volume is omitted by the omitting section from the first processor to the second processor; wherein the second processor includes: a receiver which receives the audio data transmitted from the first processor; and a reproduction data generator which generates audio reproduction data necessary to reproduce the audio data based on the received audio data.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: September 28, 2010
    Assignee: Seiko Epson Corporation
    Inventors: Tatsuya Ichikawa, Mahesh Inamdar, Anand Kumar, Aditya S. Chikodi, Kazuto Mogami
  • Patent number: 7787640
    Abstract: A spectral enhancement system is disclosed that includes an input node for receiving an input signal, at least one broad band pass filter coupled to the input node and having a first band pass range, at least one non-linear circuit coupled to the filter for non-linearly mapping a broad band pass filtered signal by a first non-linear factor n, at least one narrow band pass filter coupled to the non-linear circuit and having a second band pass range that is narrower than the first band pass range, and an output node coupled to the narrow band pass filter for providing an output signal that is spectrally enhanced.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: August 31, 2010
    Assignee: Massachusetts Institute of Technology
    Inventors: Lorenzo Turicchia, Rahul Sarpeshkar
  • Publication number: 20100215194
    Abstract: A system for amplifying a digital audio signal comprises a receiver 12 for receiving a digital audio signal, a level estimator 14 arranged to calculate the audio level of the digital audio signal, a gain control 16 arranged to receive a gain level, the gain level defining the desired amplification of the digital audio signal, a logic circuit 18 arranged to calculate the headspace in the digital audio signal and to divide the gain level into a scaling gain and an amplifier gain, the scaling gain not exceeding the calculated headspace, a digital signal processor 20 arranged to amplify the digital audio signal with the scaling gain, a digital-to-analogue converter 22 arranged to convert the amplified digital audio signal into an analogue signal, and an amplifier 24 arranged to amplify the analogue audio signal with the amplifier gain.
    Type: Application
    Filed: May 14, 2008
    Publication date: August 26, 2010
    Applicant: NXP B.V.
    Inventor: Puranjoy Bhattacharya
  • Patent number: 7783062
    Abstract: Disclosed is an automatic audio distortion control method and apparatus, wherein the automatic audio distortion control apparatus comprises an amplifier (6) and a feedback loop which has its both ends coupled to an input and an output of the amplifier (6), wherein said feedback loop has clipping distortion of signals outputted from the amplifier (6) as a control parameter for automatic control on the distortion of the amplifier (6). Once the outputted level gets close to a limit-value of speakers, the method and the apparatus will regulate power amplifier gain automatically, in order to control distortion, prevent damage to the speakers, and provide compatibility with high or low levels inputted from various audio sources.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: August 24, 2010
    Assignee: Beijing Edifier Technology Co., Ltd.
    Inventor: Min Xiao
  • Patent number: 7760886
    Abstract: For synthesizing at least three output channels using two stereo input channels, the stereo input channels are analyzed to detect signal components occurring in both input channels. A signal generator is operative to introduce at least a part of the detected signal components into the second channel associated with a second speaker in an intended speaker scheme, which is positioned between a first and a third speaker in the speaker scheme. When, however, feeding of the complete detected signal components would result in a clipping situation, then only a part of the detected signal components is fed into the second channel as a real center channel and the remainder is located in the first and third channels as a phantom center channel.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: July 20, 2010
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forscheng e.V.
    Inventors: Oliver Hellmuth, Jürgen Herre, Harald Popp, Andreas Walther
  • Publication number: 20100177915
    Abstract: A method for signal processing for a hearing aid aims to better match signal processing for a hearing aid and in particular a hearing device to a situation and includes processing an input signal in accordance with a first processing algorithm to form a first intermediate signal and processing the input signal in accordance with a second processing algorithm to form a second intermediate signal in parallel with the processing of the input signal in accordance with the first processing algorithm. The input signal is classified by a classifier. Finally, an output signal with a constant mixture ratio is formed both from the first and from the second intermediate signals, taking into account the result of the classification. This allows the advantages of a plurality of algorithms to be used at the same time. A corresponding hearing aid is also provided.
    Type: Application
    Filed: January 11, 2010
    Publication date: July 15, 2010
    Applicant: SIEMENS MEDICAL INSTRUMENTS PTE. LTD.
    Inventors: Matthias Latzel, Andreas Tiefenau
  • Patent number: 7756281
    Abstract: At least one exemplary embodiment is directed to a method of generating a Personalized Audio Content (PAC) comprising: selecting Audio Content (AC) to personalize; selecting an Earprint; and generating a PAC using the Earprint to modify the AC.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: July 13, 2010
    Assignee: Personics Holdings Inc.
    Inventors: Steven W. Goldstein, John Usher, John Patrick Keady
  • Publication number: 20100135507
    Abstract: A clipping prevention device, includes: a compression section adapted to compress an input digital audio signal level; a digital-analog conversion section adapted to operate at a predetermined first operating voltage and convert the digital audio signal into an analog audio signal; an electronic volume control adapted to operate at a second operating voltage and amplify or attenuate the analog audio signal with a user-changeable amplification factor; and a control section adapted to calculate a clipping level based on the maximum amplification factor of the electronic volume control and the user-changeable amplification factor, the maximum amplification factor being determined when the analog audio signal at the maximum signal level is amplified to the maximum signal level, and also adapted to control the compression section so that the signal is compressed so as to prevent clipping of the analog audio signal amplified or attenuated by the electronic volume control.
    Type: Application
    Filed: November 10, 2009
    Publication date: June 3, 2010
    Applicant: Sony Corporation
    Inventors: Yasuyuki Kino, Tokihiko Sawashi
  • Patent number: 7729775
    Abstract: Psychophysical tests are administered to cochlear implant (CI) users to determine a spectral modulation transfer function (SMTF), the smallest detectable spectral contrast as a function of spectral modulation frequency, for each individual CI user. The determined SMTF for individual CI user is compared against a SMTF of a normal hearing person to determine the specific enhancements needed. A spectral contrast enhancement that best fits the needed enhancements for the individual CI user is selected, and a sound processing strategy is adjusted to provide customized spectral contrast enhancement for the individual CI user. The sound processing strategy implemented includes an outer hair cell model.
    Type: Grant
    Filed: March 21, 2006
    Date of Patent: June 1, 2010
    Assignee: Advanced Bionics, LLC
    Inventors: Aniket Saoji, Leonid M. Litvak, Gene Y. Fridman
  • Patent number: 7715574
    Abstract: An apparatus (12) which overcomes the foregoing inconveniences of manually adjusting the audio device (10) volume related to a vessels speed and participants distance behind the vessel in a towable activity. This apparatus (12) controls audio volume levels (14) set at V2 and (16) set at V1 where V2 is greater than V1 and audio volume level (14) is achieved when vessels engine or propulsion shaft RPM is above set point (22) for a time greater than designated by (24), thereby controlling audio volume as a relation to vessel speed.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: May 11, 2010
    Inventor: James Edward Aikins
  • Patent number: 7715573
    Abstract: Bandwidth expansion for audio signals by frequency band translations plus adaptive gains to create higher frequencies; use of a common channel for both stereo channels limits computational complexity. Adaptive cut-off frequency determination by power spectrum curve analysis, and bass expansion by both fundamental frequency illusion and equalization.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: May 11, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Akihiro Yonemoto, Ryo Tsutsui
  • Patent number: 7706545
    Abstract: Systems and methods for providing protection from failure events in a digital audio amplification system. One embodiment of the invention comprises a system having a digital amplifier controller, an amplifier output stage coupled to the controller and configured to receive audio signals from the controller, one or more sensors coupled to the output stage and one or more low-pass filters coupled to receive sensor signals from the one or more sensors. The low-pass filter is configured to filter the sensor signals and to provide the filtered sensor signals to the controller, which provides a programmable response to the filtered sensor signals. The response may range from not taking any action, to limiting the amplification of audio signals, to shutting down the system.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: April 27, 2010
    Assignee: D2Audio Corporation
    Inventors: Michael A. Kost, Jack B. Andersen, Wilson E. Taylor
  • Patent number: 7706552
    Abstract: A satisfactory sound volume sensation from a hearing point of view can be obtained, and an effective sound volume correction operation can be obtained with an algorithm as simple as possible. Correction step 0 (correction function off, level correction value 0) to correction step 16 (level correction value—16 dB) are defined. When a first condition that is defined in such a manner as to correspond to a state in which distortion occurs is satisfied, the correction step is made to proceed by one step from the current correction step (?1 dB is added to a level correction value). When a second condition that is defined in such a manner as to correspond to a state in which distortion does not occur is satisfied, the correction step is made to return by one step from the current correction step (?1 dB is subtracted from the level correction value).
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: April 27, 2010
    Assignee: Sony Corporation
    Inventors: Yoichi Uehara, Keisuke Ozawa, Kohei Kanou, Shinji Hirose
  • Patent number: 7672464
    Abstract: The invention describes a graphical method for detecting and adjusting audio overload conditions. The graphical user interface provides a user complete playback control of several audio tracks, detection of overload conditions such as audio clipping, and graphical methods to correct the overload conditions. The graphical interface provides drag handles which the user can use to adjust the various characteristics of an audio file. The characteristics, such as amplitude and tempo, may be adjusted as a function of time.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: March 2, 2010
    Assignee: Apple Inc.
    Inventors: Curt Bianchi, Nikhil Bhatt, Christopher Moulios
  • Patent number: 7672462
    Abstract: An acoustic shock protection method and device are provided. A pattern analysis-based approach is taken to an input signal to perform feature extraction. A parameter space is identified, which is corresponding to the signal space of the input signal. A rule-based decision approach is taken to the parameter space to detect an acoustic shock event. The device may be advantageously implemented using a weighted overlap-add approach to provide low group delay, high-fidelity and a high degree of protection from acoustic shock events.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: March 2, 2010
    Assignee: AMI Semiconductor, Inc.
    Inventors: Todd Schneider, Robert L. Brennan, David Hermann, Tina Soltani
  • Patent number: 7650002
    Abstract: A level adjustment method is applicable to an audio processing apparatus having a plurality of amplifiers corresponding to three or more of input channels of an audio signal for amplifying signal levels of the respective input channels. The level adjustment method is carried out by a group arrangement process of arranging the plurality of the input channels into one or more group, and a group control process of controlling each group such as to decrease an amplification rate of all the amplifiers corresponding to the input channels belonging to the same group as a maximal one of the signal levels of the input channels belonging to the same group increases. Typically, the group arrangement process is applied to an audio signal of a surround system having at least six input channels including a left channel, a right channel, a left surround channel, a right surround channel, a center channel and an LFE channel.
    Type: Grant
    Filed: July 9, 2003
    Date of Patent: January 19, 2010
    Assignee: Yamaha Corporation
    Inventor: Hideki Hagiwara
  • Patent number: 7630507
    Abstract: A multi-channel signal processing system adapted to provide binaural compressing of tonal inputs is provided. Such a system can be used, for example, in a binaural hearing aid system to provide the dynamic-range binaural compression of the tonal inputs. The multi-channel signal processing system is essentially a system with two signal channels connected by a control link between the two signal channels, thereby allowing the binaural hearing aid system to model behaviors, such as crossed olivocochlear bundle (COCB) effects, of the human auditory system that includes a neural link between the left and right ears. The multi-channel signal processing system comprises first and second channel compressing units respectively located in first and second signal channels of the multi-channel signal processing system. The first and second channel compressing units receive first and second channel input signals, respectively, to generate first and second channel compressed outputs.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: December 8, 2009
    Assignee: GN Resound A/S
    Inventor: James M. Kates
  • Patent number: 7624259
    Abstract: A system and method for improved audio controls on a personal computer is provided. The system and method provide a unified architecture for audio controls across hardware and software interfaces of the personal computer. An intelligent facility may automatically change audio controls for users to simply interact with various communications and media applications. To this end, a configurable audio controller intelligently handles various aspects of the system's audio devices by following various rules that may be based at least in part on user-configurable settings and a current operating state. The present invention also provides audio controls so that a user may easily change audio settings such as the volume of an audio output device. There are many applications that may use the present invention for automatic control of audio devices based upon the user's context.
    Type: Grant
    Filed: March 12, 2007
    Date of Patent: November 24, 2009
    Assignee: Microsoft Corporation
    Inventors: Eric Gould Bear, Chad Magendanz, Aditha May Adams, Carl Ledbetter, Steve Kaneko, Dale C. Crosier