Spectral Adjustment Patents (Class 381/94.2)
  • Patent number: 8325939
    Abstract: This specification describes technologies relating to editing audio data. In general, one aspect of the subject matter described in this specification can be embodied in methods that include receiving an audio signal including digital audio data; receiving an input identifying particular audio data of the audio signal corresponding to a noise pulse; and replacing the audio data corresponding to the detected noise pulse using interpolation of adjacent audio data to generate an edited audio signal. Other embodiments of this aspect include corresponding systems, apparatus, and computer program products.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: December 4, 2012
    Assignee: Adobe Systems Incorporated
    Inventors: Brian King, Charles Van Winkle
  • Patent number: 8320583
    Abstract: A noise reducing device includes: a sound-signal input unit that inputs a sound signal; a time-to-frequency converting unit that converts the input sound signal obtained by being input by the sound-signal input unit into a frequency signal; a patterning unit that calculates, for each of divided frequencies of the frequency signal, an nth order polynomial (n is a natural number) as a polynomial for interpolating sampling points and acquires a coefficient pattern including a set of values of coefficients of respective orders of the polynomial; a matching-data storing unit that stores, in association with the divided frequencies, matching data indicating a matching range as a range of a coefficient pattern regarded as noise; and a noise determining unit that determines, on the basis of a result obtained by comparing the coefficient pattern acquired by the patterning unit and the matching range indicated by the matching data, at least presence or absence of noise occurrence at a divided frequency corresponding to
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: November 27, 2012
    Assignee: Sony Corporation
    Inventor: Kazuhiko Ozawa
  • Patent number: 8321043
    Abstract: In a simulation apparatus, a difference data generation part compares a simulation result of an existing sound generator with a simulation result of a virtual sound generator, and generates difference data representing a difference between the simulation result of the existing sound generator and the simulation result of the virtual sound generator. A characteristic correction part corrects a measurement result of the existing sound generator based on the difference data, and generates virtual sound generator prediction data representing the sound generation characteristic of the virtual sound generator according to the corrected measurement result of the existing sound generator.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: November 27, 2012
    Assignee: Yamaha Corporation
    Inventor: Hirofumi Onitsuka
  • Publication number: 20120288117
    Abstract: A noise filling method is provided that includes detecting a frequency band including a part encoded to 0 from a spectrum obtained by decoding a bitstream; generating a noise component for the detected frequency band; and adjusting energy of the frequency band in which the noise component is generated and filled by using energy of the noise component and energy of the frequency band including the part encoded to 0.
    Type: Application
    Filed: May 14, 2012
    Publication date: November 15, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Mi-young KIM, Eun-mi OH
  • Publication number: 20120288116
    Abstract: In a wind noise suppressor, a divider divides the frequency band an input sound into a first frequency band having a possibility that wind noise is included and a second frequency band having a frequency higher than a frequency of the first frequency band, a calculator calculates a probability that the input sound includes wind noise from feature parameters of a sound in the first frequency band, a suppressor suppresses wind noise included in the first frequency band in accordance with an intensity calculated from the probability, and an adder mixes and outputs the sound in the second frequency band divided by the divider and the sound in the first frequency band by which wind noise is suppressed by the suppressor.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 15, 2012
    Applicant: FUJITSU LIMITED
    Inventor: Mutsumi SAITO
  • Patent number: 8311236
    Abstract: A noise extraction device of the present invention includes: first and second microphone units (11 and 12) each picking up a sound; a directivity synthesis unit which performs a directivity synthesis on output signals respectively received from the first and second microphone units (11 and 12) and generates two directionally synthesized signals which have: different sensitivities to noise; the same directional pattern with respect to sound pressure; and the same effective acoustic center position; and an acoustic cancellation unit which cancels an acoustic component of one of the two directionally synthesized signals by subtracting the one of the two directionally synthesized signals from the other of the two directionally synthesized signal, so as to extract a noise component.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: November 13, 2012
    Assignee: Panasonic Corporation
    Inventor: Takeo Kanamori
  • Patent number: 8311238
    Abstract: An audio signal processing apparatus includes: a dividing section dividing each of audio signals of a plurality of channels into a plurality of frequency bands; a phase difference calculating section calculating a phase difference between the audio signals of the plurality of channels, for each of the plurality of frequency bands divided by the dividing section; a level ratio calculating section calculating a level ratio between the audio signals of the plurality of channels, for each of the plurality of frequency bands divided by the dividing section; and an audio signal processing section performing output gain setting with respect to divided signals obtained by the dividing section, on the basis of the phase difference and the level ratio for each of the plurality of frequency bands calculated by the phase difference calculating section and the level ratio calculating section.
    Type: Grant
    Filed: November 8, 2006
    Date of Patent: November 13, 2012
    Assignee: Sony Corporation
    Inventor: Tadaaki Kimijima
  • Patent number: 8311237
    Abstract: A howling suppression apparatus suppresses a howling caused in an acoustic system including a sound collection device and a sound emission device. An estimation part generates an estimated signal by estimating a feedback sound reaching the sound collection device from the sound emission device. An adjustment part generates an estimated signal by adjusting the estimated signal. A spectrum subtraction part generates an acoustic signal using a result of subtracting a frequency spectrum of the estimated signal from a frequency spectrum of an acoustic signal. A filter part generates an acoustic signal by suppressing a component of a frequency band including a howling frequency F among the acoustic signal. An acoustic signal in which the acoustic signal is amplified by an amplifier is supplied to the sound emission device.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: November 13, 2012
    Assignee: Yamaha Corporation
    Inventors: Hirobumi Tanaka, Hiraku Okumura
  • Publication number: 20120281856
    Abstract: A method of enabling a hearer to hear desired sound while also being able to be aware of ambient sound, comprises providing a first non-audio signal representative of said desired sound, deriving a second non-audio signal from said ambient sound, combining the first and second non-audio signals in providing a third non-audio signal, and converting said third non-audio signal into sound.
    Type: Application
    Filed: August 16, 2010
    Publication date: November 8, 2012
    Inventors: Archiveades Georgiou, Antony Zenonos
  • Patent number: 8306241
    Abstract: An automatic gain controller and a method using the same are provided. The automatic gain controller and method analyze background noise by operating a microphone mounted in a mobile communication terminal and automatically control the gain of the signal part which is non-audible due to the background noise. Thus, a user may listen to music by using an earphone or a headphone connected to the mobile communication terminal in an environment with background noise. The method includes receiving an audio signal to be reproduced, receiving a background noise signal introduced through a microphone, controlling a gain of the audio signal by comparing the background noise signal and the audio signal and outputting the gain-controlled audio signal so that the user can listen to the gain-controlled audio signal.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: November 6, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Gang-Youl Kim, Sang-Ki Kang, Jae-Hyun Kim
  • Patent number: 8306242
    Abstract: A method of operating a loudspeaker includes providing a digital audio signal and identifying a target transfer function to be applied to the signal. At least one coefficient of an FIR filter is generated. The generating includes performing Heyser spiral curve fitting, and fitting a three-dimensional curve based on a magnitude and phase of a target transfer function. The digital audio signal is filtered through the FIR filter. The filtered signal is inputted into the loudspeaker.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: November 6, 2012
    Assignee: Robert Bosch GmbH
    Inventor: Matthew A Donarski
  • Patent number: 8300846
    Abstract: Provided are an apparatus and method for preventing noise. The apparatus estimates a noise signal from a signal transformed into a frequency domain, uses the estimated noise signal to estimate the amplitude of the frequency-domain signal according to a frequency band, and then calculates a phase difference according to a frequency band and eliminates or prevents noise from the amplitude-estimated frequency-domain signal based on the calculated phase difference according frequency band.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: October 30, 2012
    Assignee: Samusung Electronics Co., Ltd.
    Inventors: Kyu-hong Kim, Kwang-cheol Oh
  • Patent number: 8296135
    Abstract: A noise cancellation apparatus includes a noise estimation module for receiving a noise-containing input speech, and estimating a noise therefrom to output the estimated noise; a first Wiener filter module for receiving the input speech, and applying a first Wiener filter thereto to output a first estimation of clean speech; a database for storing data of a Gaussian mixture model for modeling clean speech; and an MMSE estimation module for receiving the first estimation of clean speech and the data of the Gaussian mixture model to output a second estimation of clean speech. The apparatus further includes a final clean speech estimation module for receiving the second estimation of clean speech from the MMSE estimation module and the estimated noise from the noise estimation module, and obtaining a final Wiener filter gain therefrom to output a final estimation of clean speech by applying the final Wiener filter gain.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: October 23, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung Ok Kang, Ho-Young Jung, Sung Joo Lee, Yunkeun Lee, Jeon Gue Park, Jeom Ja Kang, Hoon Chung, Euisok Chung, Ji Hyun Wang, Hyung-Bae Jeon
  • Publication number: 20120250885
    Abstract: A signal-processing device includes a determination section that compares a frequency spectrum and a floor spectrum of an input audio signal to each other for each frequency bin and determines whether the input audio signal should be subjected to noise reduction processing or not for each of the frequency bins; and a noise reduction-processing section that subtracts a noise frequency spectrum from the frequency spectrum of the input audio signal for each of the frequency bins on the basis of the result determined by the determination section for each of the frequency bins.
    Type: Application
    Filed: March 30, 2012
    Publication date: October 4, 2012
    Applicant: NIKON CORPORATION
    Inventors: Yoko YOSHIZUKA, Mitsuhiro OKAZAKI, Kosuke OKANO
  • Patent number: 8280730
    Abstract: A method (400, 600, 700) and apparatus (220) for enhancing the intelligibility of speech emitted into a noisy environment. After filtering (408) ambient noise with a filter (304) that simulates the physical blocking of noise by a at least a part of a voice communication device (102) a frequency dependent SNR of received voice audio relative to ambient noise is computed (424) on a perceptual (e.g. Bark) frequency scale. Formants are identified (426, 600, 700) and the SNR in bands including certain formants are modified (508, 510) with formant enhancement gain factors in order to improve intelligibility. A set of high pass filter gains (338) is combined (516) with the formant enhancement gains factors yielding combined gains which are clipped (518), scaled (520) according to a total SNR, normalized (526), smoothed across time (530) and frequency (532) and used to reconstruct (532, 534) an audio signal.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: October 2, 2012
    Assignee: Motorola Mobility LLC
    Inventors: Jianming J. Song, John C. Johnson
  • Patent number: 8275154
    Abstract: An apparatus for processing an audio signal and method thereof are disclosed, by which a local dynamic range of an audio signal can be adaptively normalized as well as a maximum dynamic range of the audio signal. The present invention includes receiving, by an audio processing apparatus, a signal, and feedback information estimated based on a normalizing gain; generating a noise estimation based on the signal; computing a gain filter for noise canceling, based on the noise estimation and the signal; and, obtaining a restricted gain filter by applying the feedback information to the gain filter.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: September 25, 2012
    Assignee: LG Electronics Inc.
    Inventors: Jong Ha Moon, Hyen O Oh, Joon Il Lee, Myung Hoon Lee, Yang Won Jung, Alexis Favrot, Christof Faller
  • Patent number: 8270633
    Abstract: According to an aspect of the invention, there is provided a noise suppressing apparatus comprising: a fifth unit configured to calculate a gain for noise suppression, based on the first signal-to-noise ratio for each frequency band and the second signal-to-noise ratio for an entire frequency band; an eighth unit configured to calculate an upper limit value of a noise suppression amount for each frequency band, based on the second signal-to-noise ratio; a ninth unit configured to calculate the noise suppression amount for each frequency band, based on the first signal-to-noise ratio; and a tenth unit configured to limit, based on the upper limit value, the noise suppression amount so as to calculate the gain.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: September 18, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Takehiko Isaka
  • Publication number: 20120230505
    Abstract: Broadly speaking, the embodiments disclosed herein describe an apparatus, system, and method for managing the effects of TDMA noise emitted by a communication device on an audible circuit.
    Type: Application
    Filed: March 9, 2011
    Publication date: September 13, 2012
    Applicant: APPLE INC.
    Inventor: Edwin W. Foo
  • Patent number: 8265295
    Abstract: A system and method for analyzing a signal to monitor the dynamics of its magnitude and frequency characteristics over time. An electronic circuit for identifying feedback in an audio signal, formed in accordance with embodiments of the invention may comprise a feedback control block operable to determine a candidate frequency having potential feedback such that the feedback control block is further operable to perform an iterative analysis of the magnitude of the audio signal at the candidate frequency to determine the growth characteristics of the signal. The electronic circuit may further include a test filter block operable to deploy a test filter at a candidate frequency and a permanent filter block operable to deploy a permanent filter at the candidate frequency if the feedback control block determines that the growth characteristics of the signal at the candidate frequency comprises feedback characteristics after the test filter has been deployed.
    Type: Grant
    Filed: February 8, 2006
    Date of Patent: September 11, 2012
    Assignee: Rane Corporation
    Inventor: Dana Troxel
  • Patent number: 8259954
    Abstract: In one embodiment, one or more users may be participating in a conversation. In one example, a first user may be speaking into a speaker end device and a second user may be listening at a listener end device. The second user may be in an environment where noise may be present. Particular embodiments determine characteristics of the noise at the listener end device. Characteristics of a voice signature for a user speaking with the speaker end device are also determined. Comprehension enhancement of voice signals received from speaker end device is then performed based on characteristics of the noise at the listener end device and characteristics of the voice signature. For example, the signature of the voice signals may be altered to lessen the overlap with the noise.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: September 4, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Shmuel Shaffer, Mukul Jain, Labhesh Patel, Sanjeev Kumar
  • Patent number: 8254590
    Abstract: A method for processing an input signal to create an enhanced output signal includes obtaining an envelope of the input signal, determining a logarithm signal of the envelope, determining a rate of change of the logarithm signal to obtain a slope value, and applying a value derived from the slope value to the input signal to thereby generate an enhanced output signal.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: August 28, 2012
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Jon C. Taenzer
  • Patent number: 8249862
    Abstract: An audio processing apparatus is provided. A beamformer receives input signals and processes the input signals to generate a first processed signal. The input signals include at least one of a source signal and interference. A blocking matrix receives the input signals and operates to cancel the source signal from the input signals to generate a second processed signal. A first adaptive filter has adaptable first filter coefficients, generates a first filtered signal approximating the interference according to the first and second processed signals and continuously adapts the first filter coefficients according to the first filtered signal and the first processed signal. A second adaptive filter has adaptable second filter coefficients, generates a second filtered signal approximating the interference according to the first and second processed signals and selectively adapts the second filter coefficients according to the first filter coefficients and an output signal.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: August 21, 2012
    Assignee: Mediatek Inc.
    Inventors: Yiou-Wen Cheng, Hsi-Wen Nien
  • Patent number: 8249305
    Abstract: An information processing apparatus includes a feature value detecting section, an image processing section, and an audio processing section. The feature value detecting section determines, when a first image and a second image that are captured at different positions include a specific subject, a feature value of the subject included in the supplied first and second images. The image processing section detects motion of the subject on the basis of the feature value determined by the feature value detecting section. The audio processing section localizes a sound image of the subject in accordance with the motion of the subject detected by the image processing section.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: August 21, 2012
    Assignee: Sony Corporation
    Inventors: Tetsujiro Kondo, Tetsushi Kokubo, Kenji Tanaka, Hitoshi Mukai, Hirofumi Hibi, Kazumasa Tanaka, Takuro Ema, Hiroyuki Morisaki
  • Publication number: 20120207327
    Abstract: According to an embodiment, a method of reducing noise in a signal received at a processing stage of an acoustic system includes, at the processing stage identifying at least one frequency which causes a system gain of the acoustic system to be above an average system gain of the acoustic system; providing a noise attenuation factor for reducing noise in the signal for the at least one frequency, the noise attenuation factor for the at least one frequency based on the system gain for that frequency; and applying the noise attenuation factor to a component of the signal at that frequency.
    Type: Application
    Filed: December 15, 2011
    Publication date: August 16, 2012
    Inventors: Karsten Vandborg Sorensen, Jesus de Vicente Peña
  • Patent number: 8243953
    Abstract: A system and method for analyzing a signal to identify one or more candidate frequencies that may have a potential feedback problem. An electronic circuit for identifying feedback in an audio signal, formed in accordance with embodiments of the invention, may comprise a feedback control block operable to: 1) determine a magnitude of a first dominant spectral component in a wide-band span of frequencies of a signal, 2) determine a magnitude of a second dominant spectral component in a mid-band span of frequencies of the signal, and 3) determine a magnitude of a third dominant spectral component in a narrow-band span of frequencies of the signal. The feedback control block may then further analyze the magnitude and frequency of the first, second, and third dominant spectral components to determine the presence of feedback characteristics in the signal.
    Type: Grant
    Filed: February 8, 2006
    Date of Patent: August 14, 2012
    Assignee: Rane Corporation
    Inventor: Dana Troxel
  • Patent number: 8243969
    Abstract: A method of generating parameters representing Head-Related Transfer Functions, the method comprising the steps of a) sampling with a sample length (n) a first time-domain HRTF impulse response signal using a sampling rate (fs) yielding a first time-discrete signal, b) transforming the first time-discrete signal to the frequency domain yielding a first frequency-domain signal, c) splitting the first frequency-domain signal into sub-bands, and d) generating a first parameter of the sub-bands based on a statistical measure of values of the sub-bands.
    Type: Grant
    Filed: September 6, 2006
    Date of Patent: August 14, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Jeroen Dirk Breebaart, Michel Machiel Willem Van Loon
  • Patent number: 8243955
    Abstract: A noise attenuation system attenuates noise in an input signal. The system may estimate a power of the input signal, and determine a noise power value based on the input power estimate. The noise power value corresponds to an estimate of a noise power within the input signal. The system may determine an attenuation factor based on the noise power value, and attenuate the input signal by using the attenuation factor.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: August 14, 2012
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Bernd Iser, Gerhard Schmidt, Mathias Roder
  • Patent number: 8238568
    Abstract: According to one embodiment, an acoustic signal compensator includes an acoustic signal receiving module, a compensator, and an output module. The acoustic signal receiving module receives an acoustic signal. The compensator performs compensation on the acoustic signal, as compensation of acoustic characteristics of an ear including an ear canal having a first-order resonance characteristic and a second-order resonance characteristic, to suppress a first-order frequency of ear resonance and a second-order frequency lower than double of the first-order frequency. The output module outputs the acoustic signal compensated by the compensator.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: August 7, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kimio Miseki, Norikatsu Chiba, Yasuhiro Kanishima
  • Patent number: 8223990
    Abstract: This specification describes technologies relating to editing digital audio data. In general, one aspect of the subject matter described in this specification can be embodied in methods that include the actions of receiving an audio signal including audio data in multiple channels; identifying noise in the audio signal including identifying panning information for the audio data in the signal at each of multiple frequency bands; and attenuating the audio data at one or more frequency bands to generate an edited audio signal when the panning exceeds a specified threshold for each of the one or more frequency bands. Other embodiments of this aspect include corresponding systems, apparatus, and computer program products.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: July 17, 2012
    Assignee: Adobe Systems Incorporated
    Inventor: Brian King
  • Patent number: 8204248
    Abstract: A system locates a speaker in a room containing a loudspeaker and a microphone array. The loudspeaker transmits a sound that is partly reflected by a speaker. The microphone array detects the reflected sound and converts the sound into a microphone signal. A processor determines the speaker's direction relative to the microphone array, the speaker's distance from the microphone array, or both, based on the characteristics of the microphone signals.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: June 19, 2012
    Assignee: Nuance Communications, Inc.
    Inventors: Tim Haulick, Gerhard Uwe Schmidt, Markus Buck, Tobias Wolff
  • Patent number: 8204246
    Abstract: A sound transducer, comprising at least one acoustically neutral body with which it is possible to associate two sound conveyance elements which are shaped approximately like a stylized funnel so as to each form an auricle, which protrudes outside the acoustically neutral body and is blended with a duct with which a three-pole microphone cartridge is associated, the cartridge being arranged so that its front end, adapted to acquire the sound, is proximate to the inlet of the duct. The two cold poles of the microphone cartridges are mutually inverted, so that the cold pole of one of the microphone cartridges and the hot pole and the ground of the other of the microphone cartridges are or can be connected to a same connector or socket which is or can be associated with an amplifying and/or recording and/or processing device.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: June 19, 2012
    Assignee: Swing S.R.L.
    Inventor: Ruben Marton
  • Patent number: 8204252
    Abstract: Systems and methods for adaptive processing of a close microphone array in a noise suppression system are provided. A primary acoustic signal and a secondary acoustic signal are received. In exemplary embodiments, a frequency analysis is performed on the acoustic signals to obtain frequency sub-band signals. An adaptive equalization coefficient may then be applied to a sub-band signal of the secondary acoustic signal. A forward-facing cardioid pattern and a backward-facing cardioid pattern are then generated based on the sub-band signals. Utilizing cardioid signals of the forward-facing cardioid pattern and backward-facing cardioid pattern, noise suppression may be performed. A resulting noise suppressed signal is output.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: June 19, 2012
    Assignee: Audience, Inc.
    Inventor: Carlos Avendano
  • Patent number: 8199928
    Abstract: An apparatus processes an acoustic input signal to provide an output signal with reduced noise. The apparatus weights the input signal based on a frequency-dependent weighting function. A frequency-dependent threshold function bounds the weighting function from below.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: June 12, 2012
    Assignee: Nuance Communications, Inc.
    Inventors: Gerhard Uwe Schmidt, Raymond Brückner, Markus Buck, Ange Tchinda-Pockem, Mohamed Krini
  • Patent number: 8194883
    Abstract: A method and an apparatus for designing a sound compensation filter of a portable terminal are provided. The method includes synchronizing a signal input through a microphone of the system and a test signal, estimating a loss interval of the synchronized signal, compensating for a frame signal delayed by a signal loss in a time axis when the signal loss of the estimated loss interval is greater than a threshold and restoring the loss interval of the signal.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: June 5, 2012
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Nak-Jin Choi
  • Patent number: 8194881
    Abstract: To reliably and consistently detect desirable sounds, a system detects the presence of wind noise based on the power levels of audio signals. A first transducer detects sound originating from a first direction and a second transducer detects sound originating from a second direction. The power levels of the sound are compared. When the power level of the sound received from the second transducer is less than the power level of the sound received from the first transducer by a predetermined value, wind noise may be present. A signal processor may generate an output from one or a combination of the audio signals, based on a wind noise detection.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: June 5, 2012
    Assignee: Nuance Communications, Inc.
    Inventors: Tim Haulick, Markus Buck, Phillip A. Hetherington, Klaus Haindl
  • Patent number: 8194880
    Abstract: Systems and methods for utilizing inter-microphone level differences (ILD) to attenuate noise and enhance speech are provided. In exemplary embodiments, primary and secondary acoustic signals are received by omni-directional microphones, and converted into primary and secondary electric signals. A differential microphone array module processes the electric signals to determine a cardioid primary signal and a cardioid secondary signal. The cardioid signals are filtered through a frequency analysis module which takes the signals and mimics a cochlea implementation (i.e., cochlear domain). Energy levels of the signals are then computed, and the results are processed by an ILD module using a non-linear combination to obtain the ILD. In exemplary embodiments, the non-linear combination comprises dividing the energy level associated with the primary microphone by the energy level associated with the secondary microphone.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: June 5, 2012
    Assignee: Audience, Inc.
    Inventor: Carlos Avendano
  • Patent number: 8189809
    Abstract: An audio device includes a first audio path with a loudspeaker for reproducing an audio signal, and a second audio path. The second audio path includes in series a band-pass filter for filtering an audio signal, a detector for detecting the amplitude of the band-pass filtered audio signal, a multiplier for multiplying a periodic signal by the amplitude of the band-pass filtered audio signal, and a vibration device for reproducing the multiplied periodic signal. The frequency of the periodic signal is substantially equal to the resonance frequency of the vibration device.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: May 29, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Ronaldus Maria Aarts
  • Patent number: 8184828
    Abstract: A system for estimating the background noise in a loudspeaker-room-microphone system is presented herein where the loudspeaker is supplied with a source signal and the microphone picks up the source signal distorted by the room and provides a distorted signal. The system comprises an adaptive filter receiving the source signal and the distorted signal, and providing an error signal, a post filter connected downstream of the adaptive filter and a smoothing filter arrangement connected downstream of the adaptive filter. The smoothing filter arrangement includes a spectral domain smoothing filter that provides a spectral domain estimated-noise signal, and a time domain smoothing filter that provides a time domain estimated-noise signal.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: May 22, 2012
    Assignee: Harman Becker Automotive Systems GmbH
    Inventor: Markus Christoph
  • Patent number: 8180069
    Abstract: A signal processor uses input devices to detect speech or aural signals. Through a programmable set of weights and/or time delays (or phasing) the output of the input devices may be processed to yield a combined signal. The noise contributions of some or each of the outputs of the input devices may be estimated by a circuit element or a controller that processes the outputs of the respective input devices to yield power densities. A short-term measure or estimate of the noise contribution of the respective outputs of the input devices may be obtained by processing the power densities of some or each of the outputs of the respective input devices. Based on the short-term measure or estimate, the noise contribution of the combined signal may be estimated to enhance the combined signal when processed further. An enhancement device or post-filter may reduce noise more effectively and yield robust speech based on the estimated noise contribution of the combined signal.
    Type: Grant
    Filed: August 11, 2008
    Date of Patent: May 15, 2012
    Assignee: Nuance Communications, Inc.
    Inventors: Markus Buck, Tobias Wolff
  • Patent number: 8170226
    Abstract: In one embodiment, a two-way telecommunication device may perform acoustic echo cancellation on incoming signals. An audio decoding module may produce an audio render signal. An audio capture interface may receive an audio capture signal. A short length adaptive filter may determine a time delay between the audio render signal and the audio capture signal by adaptively predicting a sub-band of the audio capture signal using a corresponding sub-band of the audio render signal.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: May 1, 2012
    Assignee: Microsoft Corporation
    Inventors: Vinod Prakash, Chao He
  • Patent number: 8160271
    Abstract: Methods and systems for masking audio noise are disclosed. One apparatus includes a silence detector configured to detect a period of substantial silence in an audio signal; a masking noise source operably coupled to the silence detector, the masking noise source configured to generate a noise signal in response to the silence detector detecting the period of substantial silence; and at least one combining device operably coupled to the masking noise source, the at least one combining device configured to contribute to combining the audio signal and the noise signal. A method includes detecting a period of substantial silence in an audio signal; and combining masking noise with the audio signal during the period of substantial silence.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: April 17, 2012
    Assignee: Continental Automotive Systems, Inc.
    Inventors: Edward Almquist, Steven P. DeCabooter
  • Patent number: 8155302
    Abstract: An acoustic echo cancellation device for canceling an echo in a microphone signal in response to first and second input signals includes a first combination unit for combining the first and second input signals into an aggregate input signal. The device further includes an adaptive filter unit for filtering the aggregate input signal so as to produce an aggregate echo cancellation signal. A second combination unit combines the aggregate echo cancellation signal with the microphone signal so as to produce a residual signal, and an additional filter unit filters either the first or second input signal so as to produce a first or a second partial echo cancellation signal. A post-processor unit suppresses remaining echo components in the residual signal. The post-processor unit uses at least one partial echo cancellation signal to suppress echo components corresponding with the first input signal to a greater extent than echo components corresponding with the second input signal.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: April 10, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: David A. C. M. Roovers
  • Patent number: 8139788
    Abstract: An audio signal separation apparatus for separating observation signals in the time domain of a mixture of a plurality of signals including audio signals into individual signals by means of independent component analysis to produce isolated signals adapted to produce isolated signals in the time-frequency domain from the observation signals in the time-frequency domain and a separation matrix substituted by initial values, compute the modified value of the separation matrix by using a score function using the isolated signals in the time-frequency domain and a multidimensional probability density function and the separation matrix, modify the separation matrix until the separation matrix substantially converges by using the modified value and produce isolated signals in the time-frequency domain by using the substantially converging separation matrix.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: March 20, 2012
    Assignee: Sony Corporation
    Inventors: Atsuo Hiroe, Keiichi Yamada, Helmut Lucke
  • Patent number: 8135586
    Abstract: Disclosed is a method and an apparatus for estimating noise included in a sound signal during sound signal processing. The method includes estimating harmonics components in a frame of an input sound signal; using the estimated harmonics components, computing a Voice Presence Probability (VPP) on the frame of the input sound signal; determining a weight of an equation necessary to estimate a noise spectrum, depending on the computed VPP; and using the determined weight and the equation necessary to estimate a noise spectrum, estimating the noise spectrum, and updating the noise spectrum.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: March 13, 2012
    Assignees: Samsung Electronics Co., Ltd, Korea University Industrial & Academic Collaboration Foundation
    Inventors: Hyun-Soo Kim, Hanseok Ko, Sung-Joo Ahn, Jounghoon Beh, Hyun-Jin Yoon
  • Patent number: 8135145
    Abstract: The present invention discloses a multi-level output signal converter, which is connected to an audio amplifier. The audio amplifier comprises a comparing/measuring device, an encoder and an output unit. The multi-level output signal converter comprises a timing processing unit and a multi-level converter. The timing processing unit is connected to the comparing/measuring device and the encoder. The timing processing unit includes a plurality of flip-flops and a timing summing element. The flip-flop receives a first signal from the comparing/measuring device and outputs the first signal to the timing summing element. The encoder converts the first signal into a second signal. The multi-level converter is connected to the encoder and the output unit. The encoder transmits the second signal to the multi-level converter, and the multi-level converter thus outputs a third signal to the output unit.
    Type: Grant
    Filed: July 22, 2009
    Date of Patent: March 13, 2012
    Assignee: National Yunlin University of Science and Technology
    Inventors: Chun-Wei Lin, Yu-Cheng Lin, Bing-Shiun Hsieh
  • Patent number: 8135143
    Abstract: A speaker array and microphone arrays positioned on both sides of the speaker array are provided. A plurality of focal points each serving as a position of a talker are set in front of the microphone arrays respectively symmetrically with respect to a centerline of the speaker array, and a bundle of sound collecting beams is output toward the focal points. Difference values between sound collecting beams directed toward the focal points that are symmetrical with respect to the centerline are calculated to cancel sound components that detour from the speaker array to microphones. Then, it is estimated based on totals of squares of peak values of the difference values for a particular time period that the position of the talker is close to which one of the focal points, and the position of the talker is decided by comparing the totals of the squares of the peak values of the sound collecting beams directed to the focal points that are symmetrical mutually.
    Type: Grant
    Filed: November 10, 2006
    Date of Patent: March 13, 2012
    Assignee: Yamaha Corporation
    Inventors: Toshiaki Ishibashi, Satoshi Suzuki, Ryo Tanaka, Satoshi Ukai
  • Patent number: 8135137
    Abstract: The present invention is to provide a sound image localization apparatus which can prevent the lowering of the amplitude of the sound image localizing signal, the occurrence of clipping, and deterioration of the sound image localization component of the sound image localizing signal.
    Type: Grant
    Filed: March 12, 2007
    Date of Patent: March 13, 2012
    Assignee: Panasonic Corporation
    Inventor: Gempo Ito
  • Publication number: 20120057722
    Abstract: Disclosed herein is a noise removing apparatus, including: an object sound emphasis section adapted to carry out an object sound emphasis process for observation signals of first and second microphones to produce an object sound estimation signal; a noise estimation section adapted to carry out a noise estimation process for the observation signals to produce a noise estimation signal; a post filtering section adapted to remove noise components remaining in the object sound estimation signal using the noise estimation signal; a correction coefficient calculation section adapted to calculate, for each frequency, a correction coefficient for correcting the post filtering process based on the object sound estimation signal and the noise estimation signal; and a correction coefficient changing section adapted to change those of the correction coefficients which belong to a frequency band suffering from spatial aliasing such that a peak appearing at a particular frequency is suppressed.
    Type: Application
    Filed: September 2, 2011
    Publication date: March 8, 2012
    Applicant: SONY CORPORATION
    Inventors: Keiichi Osako, Toshiyuki Sekiya, Ryuichi Namba, Mototsugu Abe
  • Publication number: 20120057721
    Abstract: A concept is proposed for a MEMS microphone which may be operated at a relatively low voltage level and still have comparatively high sensitivity. The component according to the present invention includes a micromechanical microphone structure having an acoustically active diaphragm which functions as a deflectable electrode of a microphone capacitor (1), and a stationary acoustically permeable counterelement which functions as a counter electrode of the microphone capacitor (1).
    Type: Application
    Filed: January 11, 2010
    Publication date: March 8, 2012
    Inventors: Alberto Arias-Drake, Thomas Buck, Jochen Zoellin, Juan Ramos-Martos, Franz Laermer, Antonio Ragel-Morales, Joaquin Ceballos-Caceres, Jose M. Mora-Gutierrez
  • Patent number: 8116480
    Abstract: In a filter coefficient calculation device according to the present invention, a gain correction characteristic calculation section calculates impulse responses corresponding to a linear-phase filter having an inverse characteristic of a gain characteristic of a reproduction system, and calculates, as a gain correction characteristic, a frequency characteristic of continuous-time impulse responses that include a peak value, the continuous-time impulse responses being impulse responses, clipped from the calculated impulse responses, whose number is identical to the preset number of filter taps.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: February 14, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Katsutoshi Kubo