Spectral Adjustment Patents (Class 381/94.2)
  • Patent number: 8903107
    Abstract: Systems and methods improve audio signals and include means and methods of reducing stochastic noise in wideband audio signals. Multiple microphones may acquire near and far end audio signals, the audio signals may undergo transformations via a general or specialized digital signal processor.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: December 2, 2014
    Inventor: Alon Konchitsky
  • Patent number: 8903097
    Abstract: An information processing device includes: an output device configured to perform notification to a user by outputting ringing sound; a sound pickup device configured to pick up surrounding sound as ambient sound; an adaptive filtering process device configured to perform an adaptive filtering process using the picked-up ambient sound and the ringing sound output from the output device, to thereby extract, from the ambient sound, estimated environmental sound from which the ringing sound picked up by the sound pickup device has been removed; and a control device configured to control, on the basis of the feature quantity of a predetermined feature extracted from the estimated environmental sound, the adjustment of at least one of the sound volume and the sound quality of the ringing sound.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: December 2, 2014
    Assignee: Sony Corporation
    Inventor: Chisato Kemmochi
  • Patent number: 8897457
    Abstract: An earpiece (100) and a method (640) for acoustic management of multiple microphones is provided. The method can include capturing an ambient acoustic signal from an Ambient Sound Microphone (ASM) to produce an electronic ambient signal, capturing in an ear canal an internal sound from an Ear Canal Microphone (ECM) to produce an electronic internal signal, measuring a background noise signal, and mixing the electronic ambient signal with the electronic internal signal in a ratio dependent on the background noise signal to produce a mixed signal. The mixing can adjust an internal gain of the electronic internal signal and an external gain of the electronic ambient signal based on the background noise characteristics. The mixing can account for an acoustic attenuation level and an audio content level of the earpiece.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: November 25, 2014
    Assignee: Personics Holdings, LLC.
    Inventors: Steven Wayne Goldstein, Marc Andre Boillot, Jason McIntosh, John Usher
  • Patent number: 8897461
    Abstract: A system, method, and computer program product are provided for cleaning an audio segment. For a given audio segment, an offset amount is calculated where the audio segment is maximally correlated to the audio segment as offset by the offset amount. The audio segment and the audio segment as offset by the offset amount are averaged to produce a cleaned audio segment, which has had noise features reduced while having signal features (such as voiced audio) enhanced.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: November 25, 2014
    Assignee: The Intellisis Corporation
    Inventor: Eric Wiewiora
  • Patent number: 8891788
    Abstract: Psychoacoustic Bass Enhancement (PBE) is integrated with one or more other audio processing techniques, such as active noise cancellation (ANC), and/or receive voice enhancement (RVE), leveraging each technique to achieve improved audio output. This approach can be advantageous for improving the performance of headset speakers, which often lack adequate low-frequency response to effectively support ANC.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: November 18, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Ren Li, Pei Xiang
  • Patent number: 8885844
    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: April 12, 2012
    Date of Patent: November 11, 2014
    Assignee: Continental Automotive Systems, Inc
    Inventors: Edward Almquist, Steven P. DeCabooter
  • Patent number: 8885849
    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: Grant
    Filed: January 11, 2010
    Date of Patent: November 11, 2014
    Assignee: Robert Bosch GmbH
    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: 8886499
    Abstract: A voice processing apparatus includes: a phase difference calculation unit which calculates for each frequency band a phase difference between first and second frequency signals obtained by applying a time-frequency transform to sounds captured by two voice input units; a detection unit which detects a frequency band for which the percentage of the phase difference falling within a first range that the phase difference can take for a specific sound source direction, the percentage being taken over a predetermined number of frames, does not satisfy a condition corresponding to a sound coming from the direction; a range setting unit which sets, for the detected frequency band, a second range by expanding the first range; and a signal correction unit which makes the amplitude of the first and second frequency signals larger when the phase difference falls within the second range than when the phase difference falls outside the second range.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: November 11, 2014
    Assignee: Fujitsu Limited
    Inventor: Chikako Matsumoto
  • Patent number: 8880394
    Abstract: In response to a first envelope within a kth frequency band of a first channel, a speech level within the kth frequency band of the first channel is estimated. In response to a second envelope within the kth frequency band of a second channel, a noise level within the kth frequency band of the second channel is estimated. A noise suppression gain for a time frame n is computed in response to the estimated speech level for a preceding time frame, the estimated noise level for the preceding time frame, the estimated speech level for the time frame n, and the estimated noise level for the time frame n. An output channel is generated in response to multiplying the noise suppression gain for the time frame n and the first channel.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: November 4, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Devangi Nikunj Parikh, Muhammad Zubair Ikram, Takahiro Unno
  • Patent number: 8873770
    Abstract: An audio processing pipeline, for an auditory prosthesis, includes: a common stage, including a common frequency analysis filter bank, configured to generate a common set of processed signals based on an input audio signal; and first and second stimulator-specific stages, responsive to the common set of signals and including first and second frequency-analysis filter banks, configured to generate first and second sets of processed signals adapted for the first and second hearing stimulators, respectively.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: October 28, 2014
    Assignee: Cochlear Limited
    Inventors: Michael Goorevich, Paul Holmberg, Adam Hersbach
  • Patent number: 8873769
    Abstract: The present invention relates to a multi-microphone system and method adapted to determine phase angle differences between a first microphone and a second microphone signal to detect presence of wind noise.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: October 28, 2014
    Assignee: Invensense, Inc.
    Inventors: Kim Spetzler Petersen, Thomas Krogh Stoltz, Henrik Thomsen
  • Patent number: 8861746
    Abstract: A sound processing apparatus includes a target sound emphasizing unit configured to acquire a sound frequency component by emphasizing target sound in input sound in which the target sound and noise are included, a target sound suppressing unit configured to acquire a noise frequency component by suppressing the target sound in the input sound, a gain computing unit configured to compute a gain value to be multiplied by the sound frequency component using a gain function that provides a gain value and has a slope that are less than predetermined values when an energy ratio of the sound frequency component to the noise frequency component is less than or equal to a predetermined value, and a gain multiplier unit configured to multiply the sound frequency component by the gain value computed by the gain computing unit.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: October 14, 2014
    Assignee: Sony Corporation
    Inventors: Toshiyuki Sekiya, Keiichi Osako, Mototsugu Abe
  • Patent number: 8849231
    Abstract: Systems and methods for adaptive power control are provided. In exemplary embodiments, a primary signal is received. A noise power level of the primary signal is then estimated. The noise power level may then be compared to at least one power threshold. Subsequently, a large power consuming system is controlled based on the comparison of the noise power level to the power threshold.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: September 30, 2014
    Assignee: Audience, Inc.
    Inventors: Carlo Murgia, Alex Afshar, David Klein
  • Patent number: 8837744
    Abstract: A sound quality correcting apparatus includes: an input module; a feature quantity calculator; a score calculator; a modulation spectrum power calculator; a score corrector; and a signal corrector. The input module receives an input audio signal. The feature quantity calculator calculates feature quantities of the input audio signal for each of a plurality of first intervals having a certain time length. The score calculator calculates a score value for each the first interval based on the feature quantities. The modulation spectrum power calculator calculates a power value, at a certain modulation frequency, of a modulation spectrum of the input audio signal. The score corrector corrects score values in the plurality of first intervals that belong to a second interval if a power value calculated in the second interval is larger than or equal to a certain value. The signal corrector corrects the audio signal based on the score values.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: September 16, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroshi Yonekubo, Hirokazu Takeuchi
  • Patent number: 8837749
    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 audio circuit.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: September 16, 2014
    Assignee: Apple Inc.
    Inventor: Edwin W. Foo
  • Patent number: 8837750
    Abstract: A device and method for manipulating an audio signal includes a windower for generating a plurality of consecutive blocks of audio samples, the plurality of consecutive blocks including at least one padded block of audio samples, the padded block having padded values and audio signal values, a first converter for converting the padded block into a spectral representation having spectral values, a phase modifier for modifying phases of the spectral values to obtain a modified spectral representation and a second converter for converting the modified spectral representation into a modified time domain audio signal.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: September 16, 2014
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Sascha Disch, Frederik Nagel, Max Neuendorf, Christian Helmrich, Dominik Zorn
  • Patent number: 8824700
    Abstract: A power spectrum estimation unit (200) obtains an estimated sound power spectrum Ps(?), based on a power spectrum P1(?) and on a first calculated value obtained by at least multiplying a power spectrum P2(?) by a weight coefficient A2(?). A coefficient update unit (300) updates the weight coefficient A2(?) and a weight coefficient A1(?) so that a second calculated value approximates to the power spectrum P1(?). The second calculated value is obtained by adding at least two values obtained by multiplying the power spectrum P2(?) and the estimated target sound power spectrum Ps(?) by the weight coefficient A2(?) and the weight coefficient A1(?), respectively.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: September 2, 2014
    Assignee: Panasonic Corporation
    Inventors: Takeo Kanamori, Shinichi Yuzuriha, Yutaka Banba, Yasuhiro Terada
  • Patent number: 8818542
    Abstract: In order to reduce interference in an audio signal during a call on a mobile communication device, a plurality of transforms of the audio signal is performed, each transform containing phase information and amplitude information of corresponding samples of the audio signal. The results of the transforms are then averaged in order to generating a compensation signal that can be subtracted from the audio signal.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: August 26, 2014
    Assignees: Sony Corporation, Sony Mobile Communications AB
    Inventors: Jonny Strandh, Kaj Ullén
  • Patent number: 8818002
    Abstract: A novel adaptive beamforming technique with enhanced noise suppression capability. The technique incorporates the sound-source presence probability into an adaptive blocking matrix. In one embodiment the sound-source presence probability is estimated based on the instantaneous direction of arrival of the input signals and voice activity detection. The technique guarantees robustness to steering vector errors without imposing ad hoc constraints on the adaptive filter coefficients. It can provide good suppression performance for both directional interference signals as well as isotropic ambient noise.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: August 26, 2014
    Assignee: Microsoft Corp.
    Inventors: Ivan Tashev, Alejandro Acero, Byung-Jun Yoon
  • Patent number: 8811630
    Abstract: Systems, methods, and apparatus to filter audio are disclosed. An example device includes first and second audio speakers having first audio characteristics, a third audio speaker having second audio characteristics, wherein the third speaker is positioned between the first and second audio speakers, a first audio filter to process an audio input signal to have a first frequency response including a first cutoff frequency, the first audio filter to output a first audio output signal to the first audio speaker, and a second audio filter to process the audio input signal to have a second frequency response to compensate for interference between the first and second frequency responses caused by a position of the first audio speaker relative to the second audio speaker.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: August 19, 2014
    Assignee: Sonos, Inc.
    Inventor: Gregory Burlingame
  • Patent number: 8804980
    Abstract: A signal processing method for converting a signal received via a transmission path or read from a storage medium into a first audible signal, and suppressing a noise other than a desired signal contained in the first audible signal based on predetermined audio quality adjustment information, comprising steps of: in suppressing a noise other than a desired signal contained in the first audible signal to generate an enhanced signal, receiving audio quality adjustment information for adjusting audio quality; and adjusting audio quality of the enhanced signal using the audio quality adjustment information.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: August 12, 2014
    Assignee: NEC Corporation
    Inventors: Akihiko Sugiyama, Masanori Kato
  • Patent number: 8804981
    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: Grant
    Filed: December 15, 2011
    Date of Patent: August 12, 2014
    Assignee: Skype
    Inventors: Karsten Vandborg Sorensen, Jesus de Vicente Peña
  • Publication number: 20140211965
    Abstract: A system and method for audio bandwidth dependent noise suppression may detect the audio bandwidth of an audio signal responsive to one or more audio indicators. The audio indicators may include the audio sampling rate and characteristics of an associated compression format. Noise suppression gains may be calculated responsive to the audio signal. Noise suppression gains may mitigate undesirable noise in the reproduced output signal. The noise suppression gains may be modified responsive to the detected audio bandwidth. Less noise reduction may be desirable when more audio bandwidth is available. The modified noise suppression gains may be applied to the audio signal.
    Type: Application
    Filed: January 29, 2013
    Publication date: July 31, 2014
    Applicant: QNX Software Systems Limited
    Inventor: Phillip Alan Hetherington
  • Patent number: 8792652
    Abstract: A noise suppressing device includes a plurality of sound input units inputting sounds from a given sound source and converting the sounds to sound signals on a time axis, a transfer characteristic obtaining unit performing frequency transform of the sound signals after dividing the sound signals into frames and calculating respective transfer characteristics of the sounds for each given frequency band, a storage unit storing the calculated transfer characteristics of the sounds, a frequency obtaining unit obtaining a frequency for updating the transfer characteristics stored in the storage unit for the frequency band, an updating unit updating the transfer characteristics every given number of frames corresponding to the obtained frequency based on the transfer characteristics for each frequency band, a generating unit generating suppression information for suppressing the noise component based on the updated transfer characteristics, and a suppression unit suppressing the noise component based on the suppres
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: July 29, 2014
    Assignee: Fujitsu Limited
    Inventor: Taisuke Itou
  • Patent number: 8787585
    Abstract: A perceptually motivated, frequency domain active matrix decoder and decoding method which decodes N audio input signals to generate M audio output signals, where M is greater than N, including by generating M streams of output frequency components which determine the audio output signals, in response to N streams of input frequency components indicative of the audio input signals, determining power ratios from the input frequency components without use of feedback, including at least one power ratio for each critical frequency band in a set of critical frequency bands, and determining gain control values for each of the critical frequency bands from the power ratios including by shaping the power ratios in nonlinear fashion without use of feedback. An active matrix element is steered using the gain control values.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: July 22, 2014
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: C. Phillip Brown
  • Patent number: 8774875
    Abstract: Noise reduction is provided to audio captured by a headset by employing spatially separated microphones provided by a headset and a mobile phone. Primary audio is captured by a headset microphone and includes both voice audio and ambient noise. Secondary audio is captured by a mobile phone microphone and includes ambient audio. Noise reduction is performed using the primary and secondary audio to generate a noise-reduce audio.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: July 8, 2014
    Assignee: Sprint Communications Company L.P.
    Inventors: Clark Douglas Halferty, Andrew Mark Wurtenberger, Caleb Sisson Hyde
  • Patent number: 8774426
    Abstract: In a signal processing apparatus, a high frequency level detecting unit detects a level of a high frequency component adjusted with a first adjusting unit, and a first control unit controls a first gain of the adjusting unit according to the level of the high frequency component thus detected. Further, a low frequency level detecting unit detects a level of a low frequency component adjusted with a second adjusting unit. A second control unit controls a second gain according to the level of the high frequency component and the level of the low frequency component thus adjusted, so that a difference between the level of the high frequency component adjusted with the first adjusting unit and the level of the low frequency component adjusted with the second adjusting unit becomes smaller than a specific level determined in advance.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: July 8, 2014
    Assignee: Lapis Semiconductor Co., Ltd.
    Inventors: Masanori Inazumi, Naotaka Saito
  • Patent number: 8775171
    Abstract: A method and computing system for suppressing noise in an audio signal, comprising: receiving the audio signal at signal processing means; determining that another signal is input to the signal processing means, the input signal resulting from an activity which generates noise in the audio signal; and selectively suppressing noise in the audio signal in dependence on the determination that the input signal is input to the signal processing means to thereby suppress the generated noise in the audio signal.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: July 8, 2014
    Assignee: Skype
    Inventors: Karsten Vandborg Sorensen, Jon Bergenheim, Koen Vos
  • Publication number: 20140185827
    Abstract: A noise suppression apparatus using spectral subtraction is provided. A noise estimation unit estimates noise components included in a mixed signal. A fundamental frequency of the mixed signal is detected. A subtraction factor in the spectral subtraction is set based on the detected fundamental frequency. The spectral subtraction for the mixed signal is executed using the set subtraction factor and the estimated noise components. A boundary frequency at the fundamental frequency or a frequency lower than the fundamental frequency is set, and a subtraction factor for a frequency lower than the boundary frequency is set to assume a value larger than a subtraction factor for a frequency not less than the boundary frequency.
    Type: Application
    Filed: December 23, 2013
    Publication date: July 3, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Kyohei Kitazawa
  • Patent number: 8767974
    Abstract: Comfort noise, such as can be used in voice communications can be generated using methods in the frequency domain and/or in the time domain. In various embodiments, a comfort noise spectrum can be generated in the frequency domain as the product of a background noise sample and a random noise sample. In other embodiments, the comfort noise can be generated directly in the time domain as the convolution of a background noise sample and a random noise sample.
    Type: Grant
    Filed: June 15, 2005
    Date of Patent: July 1, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Youhong Lu, Ronald Fowler, Robert McGurrin, Jenny Q. Jin
  • Patent number: 8761408
    Abstract: A signal processing apparatus includes: one or more detection means for detecting movement of a diaphragm of a speaker in correspondence with feedback methods that are different feedback methods; analog-to-digital conversion means for converting one or more detection signals acquired by the detection means into a digital form; feedback signal generating means for generating feedback signals corresponding to the feedback methods using the digital detection signals; synthesis means for combining an audio signal to be output as a driving signal of the speaker with the feedback signals; correction equalizer means for setting an equalizing characteristic to allow a sound reproduced by the speaker to have a target frequency characteristic by changing the digital audio signal; feedback operation setting means for setting feedback methods in which a feedback operation up to combining the audio signal with the feedback signal is performed and the feedback operation is not performed equalizing characteristic changing a
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: June 24, 2014
    Assignee: Sony Corporation
    Inventors: Michiaki Yoneda, Taro Nakagami
  • Patent number: 8756055
    Abstract: One aspect of the invention provides a method for enhancing speech output by an electro-acoustical transducer in a noisy listening environment. In some embodiments, this method includes: filtering an input audio signal x(t) using a filter H(z) to produce a filtered audio signal x(t) formula (I), wherein x(t) formula (I)—H(z)x(t); providing to an electro-acoustical transducer a signal corresponding to the filtered audio signal x(t) formula (I) to produce a sound wave corresponding to the filtered audio signal; and prior to filtering the audio signal using the filter, configuring the filter such that, with respect to one or more frequencies, the filtered audio signal has a higher signal level than the input audio signal, and such that the overall signal level of the filtered audio signal (slƒ) is substantially related to the overall signal level of the input signal (slr) such that si/=sl/×c.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: June 17, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Anders Eriksson, Per Åhgren
  • Publication number: 20140161278
    Abstract: A sound reproduction device includes a modulator having an output terminal for outputting a modulated carrier wave signal obtained by modulating a carrier wave signal in a ultrasonic band with an audible sound signal, a super-directivity loudspeaker connected to the output terminal, a capacitor connected between a ultrasonic wave source and a ground, first and second current detectors for detecting currents flowing through the super-directivity loudspeaker and the capacitor, a high-pass filter for outputting a filtered signal obtained by eliminating a low-frequency band component of the current detected by the first current detector, and a differential amplifier unit for outputting a signal corresponding to a difference between the filtered signal and the current detected by the second current detector. The ultrasonic wave source is configured to output the carrier wave signal such that the signal output from the differential amplifier unit is constant.
    Type: Application
    Filed: August 28, 2012
    Publication date: June 12, 2014
    Applicant: PANASONIC CORPORATION
    Inventors: Fumiyasu Konno, Katsu Takeda
  • Patent number: 8750532
    Abstract: Zoom motor noise in a camera audio recording is reduced by detecting activity of the zoom motor, transforming a audio signal into the frequency domain during zoom motor activity, and scaling the frequency domain signal during zoom motor activity in each of a series of frequency bins by a scaling factor derived from a pre-stored zoom motor noise spectrum to produce a processed audio signal in the frequency domain. The processed audio signal is then transformed back to the time domain.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: June 10, 2014
    Assignee: Microsemi Semiconductor ULC
    Inventor: Qu Gary Jin
  • Patent number: 8750526
    Abstract: Provided are systems and methods for dynamic detection of changes in signal bandwidth associated with audio samples received by a communication device during handovers, where the communication device is moved through geographical areas served by different wireless network technologies. Based on the detection, operation parameters of an audio processor of the communication device may be adjusted or switched to achieve optimal performance of audio enhancing procedures (e.g., noise suppression) performed by the audio processor and to preserve minimal power consumption.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: June 10, 2014
    Assignee: Audience, Inc.
    Inventors: Peter Santos, Carlo Murgia, Matthew Cowan, Ye Jiang
  • Publication number: 20140153743
    Abstract: An audio processing device includes a setting section that sets a reproduction sampling frequency Fplay and a recording sampling frequency Frec higher than Fplay, a digital-to-analogue converter that based on Fplay converts a sound source signal that is a digital signal into a reproduction signal that is an analogue signal, an analogue-to-digital converter that based on Frec converts a recording signal that is an analogue signal converter into an input signal that is a digital signal, a signal separator that separates the input signal into a low region signal contained in a band of less than Fplay and a high region signal contained in a band of the Fplay and higher, and a breakup detector that detects whether or not breakup is occurring in the reproduced sound based on power of the high region signal.
    Type: Application
    Filed: November 14, 2013
    Publication date: June 5, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Takeshi OTANI, Taro TOGAWA, Chisato ISHIKAWA, Masanao SUZUKI
  • Patent number: 8738367
    Abstract: A speech signal processing device is equipped with a power acquisition unit, a probability distribution acquisition unit, and a correspondence degree determination unit. The power acquisition unit accepts an inputted speech signal and, based on the accepted speech signal, acquires power representing the intensity of a speech sound represented by the speech signal. The probability distribution acquisition unit acquires a probability distribution using the intensity of the power acquired by the power acquisition unit as a random variable. The correspondence degree determination unit determines whether a correspondence degree representing a degree that power acquired by the power acquisition unit in a case that a predetermined reference speech signal is inputted into the power acquisition unit corresponds with predetermined reference power is higher than a predetermined reference correspondence degree, based on the probability distribution acquired by the probability distribution acquisition unit.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: May 27, 2014
    Assignee: NEC Corporation
    Inventor: Tadashi Emori
  • Patent number: 8724828
    Abstract: A correction spectrum calculation unit 6 obtains a correction spectrum by smoothing an estimated noise spectrum in accordance with the degree of its variations, and a suppression quantity limiting coefficient calculation unit 7 decides a suppression quantity limiting coefficient from the correction spectrum. A suppression quantity calculation unit 9 obtains a suppression coefficient based on the suppression quantity limiting coefficient, and the spectrum suppression unit 10 carries out amplitude suppression of spectral components of an input signal.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: May 13, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Satoru Furuta, Takashi Sudo, Hirohisa Tasaki
  • Patent number: 8712075
    Abstract: The present invention provides a spatially pre-processed target-to-jammer ratio weighted filter and a method thereof, which uses two microphones to receive audio signals. The audio signals are divided into a plurality of sinusoidal waves by a fast Fourier transform (FFT) module, and a beamformer uses the sinusoidal waves to generate beamformed signals. A reference generator generates at least one reference signal. The beamformed signals and reference signals are used to work out power spectral densities (PSD), and a target-to-jammer ratio (TJR) is worked out with the power spectral densities. TJR is used to determine whether a sound source exists. According to the determination result, a noise estimator is switched to eliminate noise from the beamformed signals and generate output signals. An inverse fast Fourier transform (IFFT) module recombines the output signals and then outputs the recombined signals.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: April 29, 2014
    Assignee: National Chiao Tung University
    Inventors: Jwu-Sheng Hu, Ming-Tang Lee
  • Patent number: 8699722
    Abstract: A method and system to reduce the noise floor of a communications system is disclosed. The system may be incorporated into any device that provides binary samples from a datastream, such as a cordless telephone system. The system is configured to determine a number of bits of the binary samples that are affected by noise. The system is then able to remove the noise by setting those bits to a fixed value. The fixed value may depend on whether the sample is positive or negative. The value to set may be chosen so that the least significant bits of each sample come as close as possible to 0 for that particular numerical representation system. The system can be integrated with other known signal processing methods.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: April 15, 2014
    Assignee: Beken Corporation
    Inventors: Weifeng Wang, Caogang Yu
  • Patent number: 8693717
    Abstract: A novel system prevents surrounding sound to enter through a hearing apparatus, for instance through a ventilation opening, and reach an eardrum of the wearer in the form of interference sound. Contrary to auditory accessories designed especially to protect against noise, it is not possible for many hearing apparatus to compensate for such an interference sound by means of active noise cancellation. The hearing apparatuses do not have the special components needed. No compensation sound signal can therefore form with a correct phase. In accordance with the invention, a compensation sound is only generated for a relatively narrow spectral band. This spectral band is determined as a function of a hearing ability of the wearer of the hearing apparatus and/or as a function of a spectral distribution of the energy of the interference sound or a sound producing the interference sound. The improvement is particularly suited to compensating for an interference sound in a hearing device.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: April 8, 2014
    Assignee: Siemens Medical Instruments Pte. Ltd.
    Inventors: Robert Kasanmascheff, Ulrich Kornagel
  • Patent number: 8693703
    Abstract: A method of combining at least two audio signals for generating an enhanced system output signal is described.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: April 8, 2014
    Assignee: GN Netcom A/S
    Inventor: Martin Rung
  • Patent number: 8675130
    Abstract: A standalone or integrated electronic unit for selectively modifying audio or video data for use with an output device. The electronic unit has one or more audio or video inputs and one or more audio or video outputs for outputting the modified audio or video source material. The unit may include sensors, selectors, and/or logic for selecting from among a plurality of modification profiles and applies the selected profile to the audio or video source material before conveying it to the output device. The modification profile may be used to adapt an audio or video source for a specific type of audio or video playback or output device. For audio, the modification profile may be used to modify audio quality by altering the transfer function, and for video, the modification profile may be used to modify video quality by altering the visual characteristics of the video source signal.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: March 18, 2014
    Assignee: THX Ltd
    Inventor: Lawrence Fincham
  • Patent number: 8666092
    Abstract: A method and apparatus are provided for estimating the noise spectrum of an audio signal occupying a certain frequency range. The amplitude of the audio signal is measured at only a subset of the frequency range having a low expected signal to noise ratio at the time of measuring such that the measured amplitude is indicative of noise amplitude at that subset of the frequency range. A predefined noise spectral shape is then adapted by fitting to the noise amplitude so as to form the estimated noise spectrum. The noise spectrum so estimated is used to remove interference noise from the audio signal.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: March 4, 2014
    Assignee: Cambridge Silicon Radio Limited
    Inventor: Esfandiar Zavarehei
  • Publication number: 20140056440
    Abstract: Processing a signal includes: receiving data that includes an input signal; filtering the input signal to generate a filtered signal, such that if the input signal includes at least one instance of a nonlinear distortion of a desired signal then the filtered signal includes a signature signal corresponding to the nonlinear distortion, the nonlinear distortion characterized by a time duration that is within a predetermined range; and detecting whether or not the filtered signal includes the signature signal.
    Type: Application
    Filed: August 21, 2012
    Publication date: February 27, 2014
    Applicant: Bose Corporation
    Inventors: James P. Mulvey, Joseph B. Gaalaas
  • Patent number: 8654990
    Abstract: A system and method for use in filtering of an acoustic signal are provided for producing an output signal of attenuated amount of diffuse sound in accordance with predetermined parameters of desired output directional response and required attenuation of diffuse sound. The system includes a filtration module and a filter generation module including a directional analysis module and filter construction module.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: February 18, 2014
    Assignee: Waves Audio Ltd.
    Inventor: Christof Faller
  • Patent number: 8644522
    Abstract: A method and system are provided in which a device, such as an acoustic echo canceller, may reduce the residual echo that may be heard at the far end of a conversation when an external speaker volume is changed. The device may compute a gain based on an echo estimate produced by a filter and on a near-end signal comprising audio information. The gain may be based on a correlation of the echo estimate and the near-end signal that tracks the changes in volume. Once computed, the gain may be validated to ensure that it is being applied when appropriate. The echo estimate may be adjusted by first applying the gain to an output of the filter and subsequently scaling a value of each of the coefficients of the filter based on the gain. The gain may be smoothed out over consecutive frames based on several adaptation schemes.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: February 4, 2014
    Assignee: Broadcom Corporation
    Inventors: Wilfrid Paul LeBlanc, Elias Nemer
  • Patent number: 8638952
    Abstract: There is provided a signal processing apparatus, for suppressing a noise, which includes a first calculator to obtain a phase difference between two spectrum signals in a frequency domain transformed from sound signals received by at least two microphones to estimate a sound source by the phase difference, a second calculator to obtain a value representing a target signal likelihood and to determine a sound suppressing phase difference range at each frequency, in which a sound signal is suppressed, on the basis of the target signal likelihood, and a filter. The filter generate a synchronized spectrum signal by synchronizing each frequency component of one of the two spectrum signals to each frequency component of the other of the two spectrum signals for each frequency when the phase difference is within the sound suppressing phase difference range and to generate a filtered spectrum signal.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: January 28, 2014
    Assignee: Fujitsu Limited
    Inventor: Naoshi Matsuo
  • Patent number: 8634578
    Abstract: A multiband dynamics compressor implements a solution for minimizing unwanted changes to the long-term frequency response. The solution essentially proposes undoing the multiband compression in a controlled manner using much slower smoothing times. In this regard, the compensation provided acts more like an equalizer than a compressor. What is applied is a very slowly time-varying, frequency-dependent post-gain (make-up gain) that attempts to restore the smoothed long-term level of each compressor band.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: January 21, 2014
    Assignee: STMicroelectronics, Inc.
    Inventor: Earl C. Vickers
  • Patent number: 8634577
    Abstract: An audio decoder (100) comprising: effect means, decoding means, and rendering means. The effect means (500) generate modified down-mix audio signals from received down-mix audio signals. Said received down-mix audio signals comprise a down-mix of a plurality of audio objects. Said modified down-mix audio signals are obtained by applying effects to estimated audio signals corresponding to audio objects comprised in said received down-mix audio signals. Said estimated audio signals are derived from the received down-mix audio signals based on received parametric data. Said received parametric data comprise a plurality of object parameters for each of the plurality of audio objects. Said modified down-mix audio signals based on a type of the applied effect are decoded by decoding means or rendered by rendering means or combined with the output of rendering means.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: January 21, 2014
    Assignee: Koninklijke Philips N.V.
    Inventor: Dirk Jeroen Breebaart