Noise Or Distortion Suppression Patents (Class 381/94.1)
  • Patent number: 10311891
    Abstract: A method, an apparatus, and logic to post-process raw gains determined by input processing to generate post-processed gains, comprising using one or both of delta gain smoothing and decision-directed gain smoothing. The delta gain smoothing comprises applying a smoothing filter to the raw gain with a smoothing factor that depends on the gain delta: the absolute value of the difference between the raw gain for the current frame and the post-processed gain for a previous frame. The decision-directed gain smoothing comprises converting the raw gain to a signal-to-noise ratio, applying a smoothing filter with a smoothing factor to the signal-to-noise ratio to calculate a smoothed signal-to-noise ratio, and converting the smoothed signal-to-noise ratio to determine the second smoothed gain, with smoothing factor possibly dependent on the gain delta.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: June 4, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Xuejing Sun, Glenn N. Dickins
  • Patent number: 10306390
    Abstract: A level detection unit detects a level of an audio signal. A level control unit controls the level of the audio signal according to a gain. A gain control unit performs a limit operation and a recovery operation according to the level of the audio signal. A noise generation unit outputs a noise signal. A combination unit combines the audio signal from the level control unit with the noise signal. In a second recovery mode, the gain control unit increases the gain in a longer time than in a first recovery mode. The gain control unit controls the noise generation unit to output a noise signal with a predetermined level in the first recovery mode, and to output a noise signal with a level according to the gain of the level control unit in the second recovery mode.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: May 28, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Mori
  • Patent number: 10277972
    Abstract: Embodiments of the present disclosure provide a headphone and an interaction system. The headphone includes: a controller electrically connected to the Type-C interface, a biological features detection module connected to the controller, a microphone electrically connected to the controller, and a loudspeaker electrically connected to the controller. The biological features detection module is configured to detect biological features of a user wearing the headphone; and the controller is configured to control paring between the Type-C interface and a terminal and communication between the terminal and the biological features detection module, the microphone and the loudspeaker when the headphone is in a digital mode, to control detection of biological features and processing of audio data.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: April 30, 2019
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Chang Liu, Wangwang Yang, Hongliang Duan, Gengchun Deng, Haixiang Wang
  • Patent number: 10216257
    Abstract: A method and related processing system and input device are disclosed for power consumption optimization using interference measurements. The method comprises applying, within a predefined first low-power operational mode, a first set of values for at least one predefined sensing parameter and corresponding to a first power consumption level; acquiring, within the first low-power operational mode, a first interference measurement using the plurality of sensor electrodes; transitioning, upon determining the first interference measurement exceeds a first interference threshold value, into a predefined high-power operational mode; and applying, within the high-power operational mode, a second set of values for the at least one predefined sensing parameter and corresponding to a second power consumption level greater than the first power consumption level.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: February 26, 2019
    Assignee: SYNAPTICS INCORPORATED
    Inventors: Matthew Stevenson, Sanjay Mani, Nickolas V. Fotopoulos, Derek Solven, Shubha Ramakrishnan
  • Patent number: 10187721
    Abstract: A beamformer system that can isolate a desired portion of an audio signal resulting from a microphone array. A fixed beamformer is used to dampen diffuse noise while an adaptive beamformer is used to cancel directional coherent noise. A gain is calculated using a signal quality value such as signal-to-noise ratio, signal-to-null ratio or other value. The adaptive beamformer output is adjusted by the gain prior to combining the fixed beamformer output and the adaptive beamformer output to determine the output audio data.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: January 22, 2019
    Assignee: Amazon Technologies, Inc.
    Inventor: Mohamed Mansour
  • Patent number: 10182283
    Abstract: A noise cancellation device includes an anti-noise filter circuit, an output circuit, and a detection circuit. The anti-noise filter circuit provides a corresponding one of transfer functions to process a digital signal, in order to generate a noise cancellation signal, in which the transfer functions are different from each other. The output circuit mixes the noise cancellation signal, a reference signal, and an input signal to generate a mixed signal, and generates a sound output signal based on the mixed signal, in which the digital signal is associated with the sound output signal. The detection circuit controls the anti-noise filter circuit to provide the corresponding one of the transfer functions according to a comparison result of a first ratio and a first threshold value, in which the first ratio is a ratio of a first power of the mixed signal to a second power of the digital signal.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: January 15, 2019
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Pei-Wen Hsieh
  • Patent number: 10171920
    Abstract: A test apparatus for binaurally-coupled acoustic devices is disclosed. The apparatus includes a base, a lid, a primary speaker, and a binaural test fixture. The lid is coupled to the base and movable between a closed position in which the lid and base cooperate to form a closed sound chamber that is symmetric about a vertical mirror plane, and an open position. The primary speaker is coupled to one of the base and the lid, and faces a direction that lies on the mirror plane. The binaural test fixture is positioned inside the sound chamber, and includes first and second acoustic coupler mounts. The vertical mirror plane extends symmetrically between the first and second acoustic coupler mounts. A binaural test fixture, an acoustic coupler assembly, and a method of testing binaurally-coupled acoustic devices are also disclosed.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: January 1, 2019
    Assignee: ETYMONIC DESIGN INCORPORATED
    Inventors: John W. Cole, William A. Cole, Jacobus A. Jonkman, Jonathan M. Pietrobon
  • Patent number: 10158332
    Abstract: An output stage circuit including an amplifier, a switching circuit and a selection circuit is provided. The amplifier converts an input signal into an output signal. The switching circuit is coupled between an output terminal of the amplifier and ground. The selection circuit includes a first-mode-selection-unit and a second-mode-selection unit. The first control signal is selected as a switching signal by the first-mode-selection unit when a power-detection signal is in a high level, so that the switching circuit is selectively turned on. The switching circuit is turned on according to a voltage stored in a storage capacitor of the second-mode-selection unit when the power-detection signal is in a low level, so that the output terminal of the amplifier is coupled to the ground.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: December 18, 2018
    Assignee: ALI CORPORATION
    Inventor: Song-Ji Yang
  • Patent number: 10111016
    Abstract: A method of operating a hearing aid system with virtually zero delay and phase distortion. The invention also provides a hearing aid system (100) adapted for carrying out such a method.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: October 23, 2018
    Assignee: Widex A/S
    Inventors: Kristian Timm Andersen, Thomas Bo Elmedyb
  • Patent number: 10079027
    Abstract: One example discloses an apparatus for sound signal detection, comprising: a first wireless device including a first pressure sensor having a first acoustical profile and configured to capture a first set of acoustic energy within a time window; wherein the first wireless device includes a wireless signal input; wherein the first wireless device includes a processing element configured to: receive, through the wireless signal input, a second set of acoustic energy captured by a second pressure sensor, having a second acoustical profile, within a second wireless device and within the time window; apply a signal enhancement technique to the first and second sets of acoustic energy based on the first and second acoustical profiles; search for a predefined sound signal within the enhanced sets of acoustic energy; and initiate a subsequent set of sound signal detection actions if the search finds the sound signal.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: September 18, 2018
    Assignee: NXP B.V.
    Inventor: Steven Mark Thoen
  • Patent number: 10019224
    Abstract: Provided is an electronic device including a communicator including communication circuitry configured to perform wireless communication with a peripheral device and to receive information indicating at least one audio connection protocol for connecting the peripheral device to the electronic device; a processor; a memory; and one or more programs comprising instructions, stored in the memory, which, when executed by the processor, cause the processor to perform operations corresponding to the instructions, the one or more programs including instructions for selecting one of the at least one audio connection protocol based on pre-set priorities of the audio connection protocols; and instructions for outputting an audio signal to the peripheral device based on the selected audio connection protocol.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: July 10, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Byung-keuk Lim
  • Patent number: 10008218
    Abstract: A system and method of blind bandwidth extension. The system selects a prediction model from a number of stored prediction models that were generated using an unsupervised clustering method (e.g., a k-means method) and a supervised regression process (e.g., a support vector machine), and extends the bandwidth of an input musical audio signal.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: June 26, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Chih-Wei Wu, Mark S. Vinton
  • Patent number: 9984701
    Abstract: Systems and techniques for removing non-stationary and/or colored noise can include one or more of the three following innovative aspects: (1) detection of an unwanted target signal, or component thereof, within an observed signal; (2) removal of the target (component) from the observed signal; and (3) filling of a gap in the observed signal generated by removal of the unwanted target (component). Removal regions, frequency bands, and/or regions of the observed signal used to train the gap filler can be adapted in correspondence with local characteristics of the observed signal and/or the target signal (component). Related aspects also are described. For example, disclosed noise detection and/or removal methods can include converting an incoming acoustic signal to a corresponding machine-readable form. And, a corrected signal in machine-readable form can be converted to a human-perceivable form, and/or to a modulated signal form conveyed over a communication connection.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: May 29, 2018
    Assignee: Apple Inc.
    Inventors: Harvey D. Thornburg, Hyung-Suk Kim, Peter A. Raffensperger
  • Patent number: 9978393
    Abstract: Embodiment apparatus and associated methods relate to automatically improving the quality of a segmented audio stream containing a desired signal, based on filtering an audio segment with an audio filter configured to remove a predetermined noise, and adapting the audio filter degree of noise removal determined as a function of a characteristic of the desired signal in the audio segment. In an illustrative example, the desired signal may be human voice. The predetermined noise may be, for example, wireless ring, hum, or tick resulting from a wireless microphone. In various implementations, the desired signal characteristic may be voice activity detected in the audio segment, and the audio filter degree of noise removal may be adapted as a function of the voice activity. Various examples may advantageously provide faster and more accurate vocal dialog editing in sound production procedures such as ADR (known as Alternative Dialog Replacement, or, Additional Dialog Recording).
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: May 22, 2018
    Inventor: Rob Nokes
  • Patent number: 9959342
    Abstract: Techniques for online information search and retrieval for a query including a digital audio waveform. In an aspect, an audio waveform is received and digitized by at least one of a plurality of audio input devices. The digitized audio waveforms are transmitted to a central processing unit, which formulates and submits a query to an online engine. The formulated query may include the at least one digital audio waveform. The online engine retrieves one or more online results relevant to the formulated query. The online results may include one or more relevant visual results, and/or one or more relevant audio results. The retrieved results are served in real-time back to a user, via a device having audio output capability, and/or a device having visual data output capability.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: May 1, 2018
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Neal Osotio, Angela Moulden
  • Patent number: 9954496
    Abstract: At least some embodiments are directed to a system comprising an amplifier containing a first bias current source and configured to provide an output voltage at a node, a gain stage coupled to the node and comprising a second bias current source, and a buffer stage coupled to the node and comprising third and fourth bias current sources and an additional set of bias current sources, the third and fourth bias current sources are able to activate output transistors that are configured to increase current provided to a load. The system also comprises a controller configured to activate the first bias current source, to activate the second bias current source after the first bias current source is activated, to activate the bias current sources in the set after the first bias current source is activated, and to activate the third and fourth bias current sources after the first and second bias current sources are activated and after the bias current sources in the set are activated.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: April 24, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Steven G. Brantley, Bharath Karthik Vasan, John Lawrence Caldwell
  • Patent number: 9930451
    Abstract: Systems and methods are presented for power supply noise cancellation in a microphone package. A first node on a MEMS microphone package is coupled to an inverted voltage signal of a power supply output. A summing node is connected to both the first node and a second node. The second node is coupled to a non-inverted voltage signal of the power supply output. Because the parasitic capacitance of the MEMS microphone package is substantially equivalent relative to both the first node and the second node, the summing node outputs a noise-reduced summed voltage signal. An adjustable trim module is coupled to the first node and configured to adjust a reduction of a power supply noise in the summed voltage signal from the summing node.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: March 27, 2018
    Assignee: Robert Bosch GmbH
    Inventors: John M. Muza, Anthony Zisko
  • Patent number: 9881635
    Abstract: A method and system for filtering a multi-channel audio signal having a speech channel and at least one non-speech channel, to improve intelligibility of speech determined by the signal. In typical embodiments, the method includes steps of determining at least one attenuation control value indicative of a measure of similarity between speech-related content determined by the speech channel and speech-related content determined by the non-speech channel, and attenuating the non-speech channel in response to the at least one attenuation control value. Typically, the attenuating step includes scaling of a raw attenuation control signal (e.g., a ducking gain control signal) for the non-speech channel in response to the at least one attenuation control value. Some embodiments are a general or special purpose processor programmed with software or firmware and/or otherwise configured to perform filtering in accordance the invention.
    Type: Grant
    Filed: November 16, 2015
    Date of Patent: January 30, 2018
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Hannes Muesch
  • Patent number: 9858913
    Abstract: A system for noise removal is coupled to a signal unit that provides a digital signal. The noise removal system includes a transformation module to transform the digital signal into an f-digital signal, a threshold filter to generate a noiseless signal from the f-digital signal based on a threshold profile, and a signal synthesizer to provide a gain to the noiseless signal and to transform the noiseless signal into an output signal.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: January 2, 2018
    Assignee: STMICROELECTRONICS INTERNATIONAL N.V.
    Inventors: Ankur Bal, Anupam Jain, Rakhel Kumar Parida
  • Patent number: 9860668
    Abstract: The present invention relates to a method and an apparatus for processing an audio signal, and more particularly, to a method and an apparatus for processing an audio signal, which synthesizes an object signal and a channel signal and effectively binaural-render the synthesized signal.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: January 2, 2018
    Assignees: Wilus Institute Of Standards And Technology Inc., Electronics And Telecommunications Research Institute
    Inventors: Hyun Oh Oh, Taegyu Lee, Jeongil Seo
  • Patent number: 9860652
    Abstract: A test apparatus for binaurally-coupled acoustic devices is disclosed. The apparatus includes a base, a lid, a primary speaker, and a binaural test fixture. The lid is coupled to the base and movable between a closed position in which the lid and base cooperate to form a closed sound chamber that is symmetric about a vertical mirror plane, and an open position. The primary speaker is coupled to one of the base and the lid, and faces a direction that lies on the mirror plane. The binaural test fixture is positioned inside the sound chamber, and includes first and second acoustic coupler mounts. The vertical mirror plane extends symmetrically between the first and second acoustic coupler mounts. A binaural test fixture, an acoustic coupler assembly, and a method of testing binaurally-coupled acoustic devices are also disclosed.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: January 2, 2018
    Assignee: ETYMONIC DESIGN INCORPORATED
    Inventors: John W. Cole, William A. Cole, Jacobus A. Jonkman, Jonathan M. Pietrobon
  • Patent number: 9854355
    Abstract: Circuits, methods, and apparatus for grounding contacts in an audio jack. One example may provide a driver, such as a charge pump, driving a first transistor or switch coupled between a first contact in an audio jack and ground, and a second transistor or switch coupled between a second contact in the audio jack and ground. The first transistor or switch and second transistor or switch may be p-channel transistors or n-channel transistors depletion or enhancement-mode transistors, floating-gate transistors, MEMs, relays, or other switching devices. The first and second transistors or switches may be on and conducting when power is removed from the driver.
    Type: Grant
    Filed: March 6, 2015
    Date of Patent: December 26, 2017
    Assignee: APPLE INC.
    Inventors: Roderick B. Hogan, Joseph C. Curcio, David C. Breece, III, Cara S. Yang, Nathan Johanningsmeier, Kavitha Srinivasan
  • Patent number: 9832299
    Abstract: Technologies are generally described for a noise cancellation scheme for voice communications. In some examples, a system configured to cancel background noise in voice communication may include a user device configured to capture a background sound; and a server configured to receive the background sound captured by the user device, identify a source of the background sound from among a plurality of predetermined sound sources, and generate a reference background sound based at least in part on the identified source.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: November 28, 2017
    Assignee: EMPIRE TECHNOLOGY DEVELOPMENT LLC
    Inventor: Seungil Kim
  • Patent number: 9820043
    Abstract: A first correlation matrix, which corresponds to observed signals, is calculated, a non-scan range is specified, a second correlation matrix, which corresponds to an acoustic signal from a sound source within the non-scan range, is estimated, a third correlation matrix, which corresponds to a target sound source within a scan range, is calculated by removing the second correlation matrix from the first correlation matrix, and a first spatial spectrum, which is a localization result, is calculated from the third correlation matrix. In the estimation, the second correlation matrix is estimated from direction vectors calculated from a direction range of the non-scan range and a second spatial spectrum, which is a localization result calculated immediately before the first spatial spectrum is calculated.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: November 14, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Takeo Kanamori, Kohhei Hayashida, Shintaro Yoshikuni
  • Patent number: 9774743
    Abstract: A method performed by a processing system. The method includes generating silence signatures of audio signals from a plurality of device based on energy levels of the audio signals, providing the silence signatures to an interaction service, and out-putting interaction information corresponding to the devices.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: September 26, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Wai-Tian Tan, Ramin Samadani, Mary G. Baker
  • Patent number: 9761214
    Abstract: In one embodiment, a pickup system includes a wind detector and a wind suppressor. The wind detector has a plurality of analyzers each configured to analyze first and second input signals, and a combiner configured to combine outputs of the plurality of analyzers and issue, based on the combined outputs, a wind level indication signal indicative of wind activity. The analyzers can be selected from a group of analyzers including a spectral slope analyzer, a ratio analyzer, a coherence analyzer, a phase variance analyzer and the like. The wind suppressor has a ratio calculator configured to generate a ratio of the first and second input signals, and a mixer configured to select one of the first or second input signals and to apply to the selected input signal one of first or second panning coefficients based on the wind level indication signal and on the ratio.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: September 12, 2017
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Glenn N Dickins, Leif Jonas Samuelsson
  • Patent number: 9743179
    Abstract: In a system and method for maintaining the spatial stability of a sound field a balance gain may be calculated for two or more microphone signals. The balance gain may be associated with a spatial image in the sound field. Signal values may be calculated for each of the microphone. The signal values may be signal estimates or signal gains calculated to improve a characteristic of the microphone signals. The differences between the signal values associated with each microphone signal may be limited although some difference between signal values may be allowable. One or more microphone signals are adjusted responsive to the two or more balance gains and the signal gains to maintain the spatial stability of the sound field. The adjustments of one or more microphone signals may include mixing of two or more microphone. The signal gains are applied to the two or more microphone signals.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: August 22, 2017
    Assignee: 2236008 Ontario INC.
    Inventor: Phillip Alan Hetherington
  • Patent number: 9685150
    Abstract: A system for noise removal is coupled to a signal unit that provides a digital signal. The noise removal system includes a transformation module to transform the digital signal into an f-digital signal, a threshold filter to generate a noiseless signal from the f-digital signal based on a threshold profile, and a signal synthesizer to provide a gain to the noiseless signal and to transform the noiseless signal into an output signal.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: June 20, 2017
    Assignee: STMICROELECTRONICS INTERNATIONAL N.V.
    Inventors: Ankur Bal, Anupam Jain, Rakhel Kumar Parida
  • Patent number: 9672805
    Abstract: A crosstalk cancelation technique reduces feedback in a shared acoustic space by canceling out some or all parts of sound signals that would otherwise be produced by a loudspeaker to only be captured by a microphone that, recursively, would cause these sounds signals to be reproduced again on the loudspeaker as feedback. Crosstalk cancelation can be used in a multichannel acoustic system (MAS) comprising an arrangement of microphones, loudspeakers, and a processor to together enhance conversational speech between in a shared acoustic space. To achieve crosstalk cancelation, a processor analyzes the inputs of each microphone, compares it to the output of far loudspeaker(s) relative to each such microphone, and cancels out any portion of a sound signal received by the microphone that matches signals that were just produced by the far loudspeaker(s) and sending only the remaining sound signal (if any) to such far loudspeakers.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: June 6, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Lae-Hoon Kim, Asif Iqbal Mohammad, Erik Visser
  • Patent number: 9646632
    Abstract: An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: May 9, 2017
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Stefan Bayer, Sascha Disch, Ralf Geiger, Guillaume Fuchs, Max Neuendorf, Gerald Schuller, Bernd Edler
  • Patent number: 9621989
    Abstract: Disclosed herein are system, method, and computer program product embodiments for maintaining a temperature of an audio device during playback of audio content without audio interference. An embodiment operates by receiving a data stream comprising audio content for playback. The audio device determines a volume level of the audio content using the data stream. The audio device then controls a cooling device based on the volume level compared to a threshold value. This reduces the amount of time the cooling device is turned on during playback of the audio content. This reduces audio interference, improves the user playback experience, and prevents overheating of the audio device which improves reliability and reduces audio device failure rate.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: April 11, 2017
    Assignee: Roku, Inc.
    Inventors: Gregory M. Garner, Joseph Hollinger
  • Patent number: 9620025
    Abstract: A wake vortex avoidance system includes a microphone array configured to detect low frequency sounds. A signal processor determines a geometric mean coherence based on the detected low frequency sounds. A display displays wake vortices based on the determined geometric mean coherence.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: April 11, 2017
    Assignee: The United States of America as Represented by the Administrator of the National Aeronautics and Space Administration.
    Inventors: Qamar A. Shams, Allan J. Zuckerwar, Howard K. Knight
  • Patent number: 9589573
    Abstract: A method of wind noise reduction. Left side and right side microphone signals are obtained. In a first stage wind noise reduction is applied to a first sub-band of one of the signals, below a spectral threshold NA. In a second stage the wind noise reduced first side signal, and the second side signal, are both split into a sub-band below a threshold NB less than NA. The sub-band of the first side signal is mixed with the sub-band of the second side signal to produce an aggregate third sub-band signal having reduced wind noise, which is recombined with the respective sub-bands above the threshold NB to produce output first and second side signals.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: March 7, 2017
    Assignee: Cirrus Logic International Semiconductor Ltd.
    Inventors: Thomas Ivan Harvey, Vitaliy Sapozhnykov
  • Patent number: 9473860
    Abstract: A method for beam-forming for a hearing aid system is disclosed. The hearing aid system has a left and a right hearing aid device for disposal on a head of a wearer. The hearing aid devices each have microphones for converting the sound into a left and a right input signal and also a signal processing device which receives the two input signals. In the method a number of different linear combinations of the left and the right input signal are provided, are assessed according to a predetermined signal criterion and, in dependence thereof, one of the linear combinations is selected as a beam signal.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: October 18, 2016
    Assignee: Sivantos Pte. Ltd.
    Inventors: Eghart Fischer, Homayoun Kamkar Parsi
  • Patent number: 9443505
    Abstract: A system for infrasonic pressure fluctuation (infrasound) control of a structure defining an interior. The system includes a reversible compressor including a housing defining an interior opening interface open to the interior of the structure and an exterior opening interface open to an exterior of the structure, and including at least one controllable element to generate positive pressure flows and negative pressure flows between the interior opening interface and the exterior opening interface. The system includes a first pressure sensor located to sense pressure indicative of the interior of the structure, a second pressure sensor located to sense pressure indicative of the exterior of the structure, and at least one controller configured to control the at least one controllable element of the compressor to cancel pressure oscillations within the interior of the structure based on the pressures detected by the first pressure sensor and the second pressure sensor.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: September 13, 2016
    Assignee: KEVIN ALLAN DOOLEY, INC.
    Inventors: Kevin Allan Dooley, Elwood A. Morris
  • Patent number: 9432787
    Abstract: Systems and methods for determining the operating condition of multiple microphones of an electronic device are disclosed. A system can include a plurality of microphones operative to receive signals, a microphone condition detector, and a plurality of microphone condition determination sources. The microphone condition detector can determine a condition for each of the plurality of microphones by using the received signals and accessing at least one microphone condition determination source.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: August 30, 2016
    Assignee: Apple Inc.
    Inventors: Arvindh Krishnaswamy, David T. Yeh, Juha O. Merimaa, Sean A. Ramprashad
  • Patent number: 9432766
    Abstract: An improved scheme for identifying and removing musical noise in an audio processing device can be achieved in an audio processing device that includes an analysis path with a perceptive model of the human auditory system and provides an audibility measure. The device may also identify an artifact introduced into the processed signal by the processing algorithm and provide an artifact identification measure, and control a gain applied to a signal of the forward path by the processing algorithm based on the perceptive model. An advantage is to dynamically optimize noise reduction with a view to audibility of artifacts and is applicable to hearing aids, headsets, ear phones, active ear protection systems, hands-free telephone systems, mobile telephones, teleconferencing systems, public address systems, karaoke systems, and classroom amplification systems.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: August 30, 2016
    Assignee: OTICON A/S
    Inventors: Jesper Jensen, Michael Syskind Pedersen
  • Patent number: 9407230
    Abstract: An apparatus is provided with a device storing machine readable code and a processor executing the machine readable code. The machine readable code includes sound setting code and audio processing code. The sound setting code detects use of a microphone and sets sound characteristics that are suitable for conversation in response to detecting the use of the microphone. The audio processing code processes sound on the basis of the sound characteristics set by the sound setting code.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: August 2, 2016
    Assignee: Lenovo (Singapore) PTE. LTD.
    Inventors: Shinichi Kikuchi, Hironari Nishino, Yasushi Tsukamoto
  • Patent number: 9380386
    Abstract: A device and method relates to reducing distortion of signal. The device includes a first filter unit for generating a correction band signal, a signal level detection unit for detecting a signal level of the correction band signal, a first lookup table unit for determining a control signal, a second lookup table unit for determining a correction amount, a correction band extraction signal generation unit for generating a correction band extraction signal, a correction signal generation unit for generating a correction signal, a first edge detection unit for generating an overtone signal from the correction band extraction signal, a filter unit for suppressing high-frequency range and low-frequency range signal levels of the overtone signal, a first amplification unit for amplifying the overtone signal, a second filter unit for generating a complement signal from the overtone signal, and an output signal generation unit for generating an output signal.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: June 28, 2016
    Assignee: CLARION CO., LTD.
    Inventor: Yasuhiro Fujita
  • Patent number: 9357295
    Abstract: According to an embodiment, an interface circuit includes a current replicator and a receiver. The current replicator includes a power terminal coupled to a first reference node, an output terminal configured to output a signal proportional to a signal received from a transducer, and an interface terminal coupled to the transducer. Using a single interface terminal, the current replicator may be configured to provide power to the transducer and receive output signals from the transducer. The receiver may include a first input terminal coupled to the output terminal, a second input terminal coupled to a second reference node, and a current converter circuit coupled to the first input terminal.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: May 31, 2016
    Assignee: Infineon Technologies AG
    Inventors: Wilfried Florian, Andreas Wiesbauer, Richard Gaggl
  • Patent number: 9343056
    Abstract: Wind noise is detected in and removed from an acoustic signal. Features may be extracted from the acoustic signal. The extracted features may be processed to classify the signal as including wind noise or not. The wind noise may be removed before or during processing of the acoustic signal. The wind noise may be suppressed by estimating a wind noise model, deriving a modification, and applying the modification to the acoustic signal. In audio devices with multiple microphones, the channel exhibiting wind noise (i.e., acoustic signal frame associated with the wind noise) may be discarded for the frame in which wind noise is detected.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: May 17, 2016
    Assignee: Knowles Electronics, LLC
    Inventor: Michael M. Goodwin
  • Patent number: 9318232
    Abstract: A new apparatus, system, and technique for performing Matrix Spectral Factorization has been developed, which can factorize in real time high-dimensional matrices with high-order polynomial or non-rational entries. The method can be used for efficient implementation of engineering solutions to problems in Data Compression, Filtering, Wireless Communications, and Radar Systems, etc., which are computationally reducible to matrix spectral factorization.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: April 19, 2016
    Assignee: University of Maryland
    Inventors: Anthony Ephremides, Gigla Janashia, Levan Janashia, Lasha Ephremidze, Edem Lagvilava
  • Patent number: 9318124
    Abstract: There is provided a sound signal processing device, in which an observation signal analysis unit receives multi-channels of sound-signals acquired by a sound-signal input unit and estimates a sound direction and a sound segment of a target sound to be extracted and a sound source extraction unit receives the sound direction and the sound segment of the target sound and extracts a sound-signal of the target sound. By applying short-time Fourier transform to the incoming multi-channel sound-signals this device generates an observation signal in the time-frequency domain and detects the sound direction and the sound segment of the target sound. Further, based on the sound direction and the sound segment of the target sound, this device generates a reference signal corresponding to a time envelope indicating changes of the target's sound volume in the time direction, and extracts the signal of the target sound, utilizing the reference signal.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: April 19, 2016
    Assignee: SONY CORPORATION
    Inventor: Atsuo Hiroe
  • Patent number: 9294062
    Abstract: The present technique relates to a sound processing apparatus, a method, and a program capable of alleviating degradation of the quality of sound in a case where the gain of a sound signal is amplified. When equalizer processing for adjusting the gain of each frequency band of an input signal on the basis of a gain setting value is performed, an input signal is attenuated by an input attenuation amount derived from the gain setting value, and the equalizer processing is performed on the input signal attenuated. The amount of amplification of the gain of the input signal in the equalizer processing is estimated on the basis of the gain setting value and a weight coefficient of each frequency band derived from a generally-available music signal prepared in advance, and a difference of the estimation value and the input attenuation amount is calculated as a gain correction amount.
    Type: Grant
    Filed: September 3, 2012
    Date of Patent: March 22, 2016
    Assignee: SONY CORPORATION
    Inventors: Mitsuyuki Hatanaka, Toru Chinen
  • Patent number: 9282229
    Abstract: A processor combines a first predicted signal generated based on an audio signal in an interval preceding a noise detection interval, and a second predicted signal generated based on an audio signal in an interval succeeding the noise detection interval, based on the ratio between the periodicity of the audio signal in the interval preceding the noise detection interval, and the periodicity of the audio signal in the interval succeeding the noise detection interval. The processor replaces the audio signal in the noise detection interval with the combined signal.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: March 8, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Fumihiro Kajimura, Masafumi Kimura
  • Patent number: 9277102
    Abstract: An audio processing apparatus including: an obtaining unit configured to obtain audio signals; and a processor configured to process the audio signals, wherein if it is not determined that the audio signals contain an abnormal value, the processor calculates a next sample value based on a predetermined number of sample values of the audio signals obtained by the obtaining unit, and wherein if it is determined that the audio signals contain an abnormal value, the processor uses the calculated next sample value so as to calculate a further next sample value.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: March 1, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masafumi Kimura, Fumihiro Kajimura
  • Patent number: 9264019
    Abstract: FIR filters for compensating for fixed pattern jitter, and methods of constructing the same, are disclosed. In one embodiment, a FIR filter filters a signal having a desired frequency component, with the coefficients of the FIR filter selected so that the filter is the equivalent of two combined FIR filters, one having the desired frequency at the filter's peak output frequency, and a second in which the signal is delayed by a time equal to half of a period of a different frequency which is desired to be removed from the output signal. In another embodiment, a FIR filter includes a delay line with a total delay longer than the period of the jitter. A signal is passed down the delay line, the number of signal edges that have occurred as the signal passes each delay element in the counted. Drivers corresponding to the delay elements in which a number of signal edges occur at the desired frequency during the period of fixed pattern jitter activate impedance elements attached to those delay elements.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: February 16, 2016
    Assignee: ESS Technology, Inc.
    Inventor: A. Martin Mallinson
  • Patent number: 9227034
    Abstract: A system for reducing airway obstructions of a patient may include a ventilator, a control unit, a gas delivery circuit with a proximal end in fluid communication with the ventilator and a distal end in fluid communication with a nasal interface, and a nasal interface. The nasal interface may include at least one jet nozzle, and at least one spontaneous respiration sensor in communication with the control unit for detecting a respiration effort pattern and a need for supporting airway patency. The system may be open to ambient. The control unit may determine more than one gas output velocities. The more than one gas output velocities may be synchronized with different parts of a spontaneous breath effort cycle, and a gas output velocity may be determined by a need for supporting airway patency.
    Type: Grant
    Filed: April 2, 2010
    Date of Patent: January 5, 2016
    Assignee: Beathe Technologies, Inc.
    Inventors: Gregory Kapust, Todd Allum, Anthony D. Wondka, Joseph Cipollone, Anthony Gerber, Darius Eghbal, Joey Aguirre, George A. Kassanis
  • Patent number: 9192319
    Abstract: A method for separating signal sources by use of physically unique dictionary elements. The method is particularly advantageous for separating cerebral from artifactual sources in electroencephalographic (EEG) recording, making use of dictionary element pattern recognition methods that are tuned to the unique physical properties of each source domain.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: November 24, 2015
    Assignee: Electrical Geodesics, Inc.
    Inventors: Jidong Hou, Don M. Tucker
  • Patent number: 9177541
    Abstract: A method for operating an active noise reduction system that is designed to reduce the harmonic or sinusoidal noise emanating from a rotating device, where there is an active noise reduction system input signal that is related to the frequency of the noise to be reduced, and where the active noise reduction system comprises one or more adaptive filters that output a generally sinusoidal noise reduction signal that is used to drive one or more transducers with their outputs directed to reduce the noise. Distortions of the noise reduction signal are detected. A distortion is based at least in part on differences between the frequency of the noise reduction signal and the frequency of the harmonic noise. The noise reduction signal is altered based on the detected distortion.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: November 3, 2015
    Assignee: Bose Corporation
    Inventor: Alaganandan Ganeshkumar