Acoustic, Nonairborne Vibration Sensing Or Counterwave Emission Patents (Class 381/71.2)
  • Patent number: 9813060
    Abstract: An actuator for controlling the operation of an apparatus comprises a panel (16) and an acoustic sensor (26). The panel provides a partition within a building structure, while the acoustic sensor is adapted to detect acoustic waves propagating through the panel. When a user exerts pressure against the panel, the sensor detects the acoustic waves that are formed and emits signals for controlling the operation of an apparatus, such as a doorbell, a light source, a television, a sound system, a ventilation system, a window blind, a radio or an alarm.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: November 7, 2017
    Assignee: Saint-Gobain Placo SAS
    Inventors: Marie-Virginie Ehrensperger, Paul-Henri Guering, Philippe Laval, Richard Morlat, Jean-Louis Mongrolle, Yves Benkemoun, Christelle Pousse
  • Patent number: 9773493
    Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from an output of a microphone that measures ambient audio. The anti-noise signal is combined with source audio to provide an output for a speaker. The anti-noise signal causes cancellation of ambient audio sounds that appear at the microphone. A processing circuit estimates a level of background noise from the microphone output and sets a power conservation mode of the personal audio device in response to detecting that the background noise level is lower than a predetermined threshold.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: September 26, 2017
    Assignee: CIRRUS LOGIC, INC.
    Inventors: Yang Lu, Dayong Zhou, Jon D. Hendrix, Jeffrey Alderson
  • Patent number: 9691373
    Abstract: A noise controller includes a first control unit that outputs a control signal for outputting sound for reducing noise to a first speaker, a first characteristic circuit that generates a signal by performing convolution, using a transfer characteristic from the second speaker to a second sound collector, on a control signal output from the first control unit to a second speaker, a subtractor that subtracts the signal generated by the first characteristic circuit from an output signal of a second sound collector and outputs a resultant signal. The first control unit generates the control signal to be output to the first speaker while the output signal from the subtractor serves as a reference signal so that an output signal of the first sound collector is minimized, and outputs the control signal to the first speaker.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: June 27, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Hiroyuki Kano
  • Patent number: 9596540
    Abstract: An active noise reduction device is used with a secondary noise source that generates a secondary noise and an error signal source that outputs an error signal corresponding to a residual sound caused by interference between the secondary noise and a noise. A ?-adjustment unit calculates a step-size parameter for updating a filter coefficient of an adaptive filter by multiplying a standard step-size parameter by a ratio of a standard representative input value corresponding to amplitude of a signal to a representative input value corresponding to the amplitude of the signal.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: March 14, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Mitsuhiro Tani, Toshiyuki Funayama, Mitsuru Kaitou
  • Patent number: 9318092
    Abstract: A noise estimation control system may limit increases of a stored background noise estimate in response to a detected noise feedback situation. The system receives an input audio signal detected within a space, and a reference audio signal that is transmitted by a speaker as an aural signal into the space. A signal processor processes the input audio signal and the reference audio signal to determine a coherence value based on an amount of the aural signal that is included in the input audio signal. The signal processor also calculates an amount to adjust the stored background noise estimate based on the coherence value and a determined background noise level of the input audio signal.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: April 19, 2016
    Assignee: 2236008 Ontario Inc.
    Inventor: Phillip Alan Hetherington
  • Patent number: 9210525
    Abstract: A sound field control apparatus appropriately presenting desired sound in a listening area and sufficiently reducing the sound in a nearby area without constraint on configuration arrangement includes: a listening compensation filter processing a signal from a sound source using a control characteristic and outputting the signal to a second speaker; and a control filter processing the signal from the listening compensation filter using a control characteristic and outputting the signal to a first speaker. The characteristic of the control filter is a first previously-set characteristic whereby reproduced sound from the second speaker is reduced by reproduced sound from the first speaker at a first control position. The characteristic of the listening compensation filter is a second previously-set characteristic whereby sound having a predetermined target acoustic characteristic is presented by reproduced sounds from the first and second speakers at a second control position.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: December 8, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Hiroyuki Kano
  • Patent number: 9148728
    Abstract: A piezoelectric sound transducer using a piezoelectric plastic material is developed from a substrate layer and a layer of a piezoelectric plastic material deposited thereon, the piezoelectric plastic layer covering the substrate layer not completely but having openings.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: September 29, 2015
    Assignee: ROBERT BOSCH GMBH
    Inventors: Steffen Polster, Andre Gerlach, Claudia Arnold, Stefan Zimmermann
  • Patent number: 9042569
    Abstract: An active noise control device detects composite vibration of a vibration transmitting route to which both vibration of a rotating body caused by generation or transmission of drive force of a vehicle and vibration of a wheel generated by contact between the wheel and a road surface are transmitted. A first reference signal for defining a reference waveform of a canceling sound for canceling vibration noise in a vehicle interior is generated based on the composite vibration. The component of the canceling sound for canceling vibration noise of the rotating body is removed from the first reference signal to generate a second reference signal for defining a reference waveform of the canceling sound for canceling vibration noise of the wheel. The canceling sound is outputted based on the second reference signal.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: May 26, 2015
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kosuke Sakamoto, Toshio Inoue
  • Patent number: 9020159
    Abstract: A noise control device includes the following structural elements. A signal memory records both of a noise signal supplied from a noise microphone and an error signal supplied from an error microphone. A filter coefficient calculator calculates a fixed filter coefficient of a control filter by using data recorded in the signal memory. A filter coefficient renewing section renews, at a given timing, a filter coefficient set at a fixed filter in a control filter to a filter coefficient read out from the filter coefficient calculator.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: April 28, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Keiji Mori, Hiroyuki Kano, Tsuyoshi Maeda, Yoshifumi Asao
  • Patent number: 9008329
    Abstract: Provided are methods and systems for noise suppression within multiple time-frequency points of spectral representations. A multi-feature cluster tracker is used to track signal and noise sources and to predict signal versus noise dominance at each time-frequency point. Multiple features, such as binaural and monaural features, may be used for these purposes. A Gaussian mixture model (GMM) is developed and, in some embodiments, dynamically updated for distinguishing signal from noise and performing mask-based noise reduction. Each frequency band may use a different GMM or share a GMM with other frequency bands. A GMM may be combined from two models, with one trained to model time-frequency points in which the target dominates and another trained to model time-frequency points in which the noise dominates. Dynamic updates of a GMM may be performed using an expectation-maximization algorithm in an unsupervised fashion.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: April 14, 2015
    Assignee: Audience, Inc.
    Inventors: Michael Mandel, Carlos Avendano
  • Patent number: 8995676
    Abstract: A hearing protector comprises two protective muffs (1) with passive noise damping, a microphone (3) disposed in at least the one protective muff (1) and connected to an analog and a digital signal processing device (5 and 7, respectively), the signal processing devices (5, 7) being connected to loudspeakers (4) disposed interiorly in the protective muffs (1) for extinguishing interior noise in the protective muffs (1). The analog signal processing device is rehearsed for processing non-repeatable noise, while the digital signal processing device is rehearsed for processing repeatable noise. According to the invention, a further microphone (8) is disposed outside the passive noise damping and is connected to the digital signal processing device for tracing and locking onto repeatable noise.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: March 31, 2015
    Assignee: 3M Svenska AB
    Inventor: Henrik Fransson
  • Patent number: 8989399
    Abstract: Reflection cancelling boundary microphones are described in which a microphone capsule is mounted within the pressure zone of a vibrating surface and the microphone is tuned in such a way as to cancel pressure waves reflected by the surface while admitting pressure waves generated by the vibration of the surface. One embodiment of the invention includes a microphone capsule configured to be mounted within the pressure zone of a vibrating surface. In addition, the microphone is tuned to cancel pressure waves reflected by the surface while admitting pressure waves generated by the vibration of the surface.
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: March 24, 2015
    Assignee: Lloyd Baggs Innovations, LLC
    Inventor: Lloyd R. Baggs
  • Publication number: 20150063581
    Abstract: An active noise reduction device is used with a secondary noise source that generates a secondary noise and an error signal source that outputs an error signal corresponding to a residual sound caused by interference between the secondary noise and a noise. A ?-adjustment unit calculates a step-size parameter for updating a filter coefficient of an adaptive filter by multiplying a standard step-size parameter by a ratio of a standard representative input value corresponding to amplitude of a signal to a representative input value corresponding to the amplitude of the signal.
    Type: Application
    Filed: June 25, 2013
    Publication date: March 5, 2015
    Inventors: Mitsuhiro Tani, Toshiyuki Funayama, Mitsuru Kaitou
  • Patent number: 8958571
    Abstract: A personal audio device, such as a wireless telephone, includes noise canceling circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone may also be provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether one of the reference or error microphones is obstructed by comparing their received signal content and takes action to avoid generation of erroneous anti-noise.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: February 17, 2015
    Assignee: Cirrus Logic, Inc.
    Inventors: Nitin Kwatra, Jeffrey Alderson, Jon D. Hendrix
  • Patent number: 8949120
    Abstract: Systems and methods for controlling adaptivity of noise cancellation are presented. One or more audio signals are received by one or more corresponding microphones. The one or more signals may be decomposed into frequency sub-bands. Noise cancellation consistent with identified adaptation constraints is performed on the one or more audio signals. The one or more audio signals may then be reconstructed from the frequency sub-bands and outputted via an output device.
    Type: Grant
    Filed: April 13, 2009
    Date of Patent: February 3, 2015
    Assignee: Audience, Inc.
    Inventors: Mark Every, Ludger Solbach, Carlo Murgia, Ye Jiang
  • Patent number: 8948411
    Abstract: Disclosed, in general, are devices that provide an air-tight chamber over a sound source while absorbing all fields of sounds from the sound source. In general, the devices feature: an anechoic chamber that is configured to receive a sound source in an air-tight manner; and an anechoic channel that is in fluid communication with the ambient atmosphere. Suitably, the anechoic chamber is adapted to capture air containing sound energy generated by the sound source, and distribute the air about an internal surface area on the inside of the chamber, wherein the internal surface area is sufficiently large to dampen or otherwise absorb the sounds energy. Preferably, the air is directed from the anechoic chamber through an anechoic channel extending therefrom to the ambient to further dampen or absorb the sound energy. In one configuration, the outer wall of the apparatus is configured to reflect ambient sounds.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: February 3, 2015
    Inventor: Scott A. Moser
  • Patent number: 8948409
    Abstract: The headset comprises two earpieces each having a transducer for playing back the sound of an audio signal and received in an acoustic cavity defined by a shell having an ear-surrounding cushion. The active noise control comprises, in parallel, a feedforward bandpass filter receiving the signal from an external microphone, a feedback bandpass filter receiving as input an error signal delivered by an internal microphone, and a stabilizer bandpass filter locally increasing the phase of the transfer function of the feedback filter in an instability zone, in particular a waterbed effect zone around 1 kHz. A summing circuit delivers a weighting linear combination of the signal delivered by these filters together with the audio signal to be played back. Control is non-adaptive, with the parameters of the filters being static.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: February 3, 2015
    Assignee: Parrot
    Inventor: Phong Hua
  • Publication number: 20150030172
    Abstract: In an audio system having acoustic echo, incoming audio signals are decorrelated by applying both phase modulation and amplitude modulation. The resulting decorrelated signals are rendered by loudspeakers, and co-located microphones generate outgoing audio signals that include echo signals caused by the existence of acoustic echo paths from the loudspeakers to the microphones. Acoustic echo cancellation (AEC) is applied to the outgoing audio signals to reduce the amount of echo in those signals. Decorrelating the incoming audios signals using amplitude modulation in addition to phase modulation can increase the effectiveness of the AEC processing. In a frequency-domain implementation, the amount of amplitude modulation can be different for different frequency bands (e.g., greater amplitude modulation for lower frequencies corresponding to human speech and/or no amplitude modulation for higher frequencies).
    Type: Application
    Filed: July 18, 2014
    Publication date: January 29, 2015
    Inventors: Tomas F. Gaensler, Eric J. Diethorn
  • Publication number: 20140376732
    Abstract: A Device Echo Cancellation system and process are disclosed. According to one embodiment, the present invention comprises an input audio source that is converted to a digital signal via a PCM convertor where the amplitude of the input audio source is sampled at regular intervals and translated into digital PCM audio. The resulting PCM audio is analyzed for its dynamic and harmonic content. Corrective sound waves are then generated that reduce the repetition of the original audio (echoes). The corrective sound waves are applied to the repeating audio echoes to create corrected sound waves. The corrected audio is then outputted from the system.
    Type: Application
    Filed: February 19, 2014
    Publication date: December 25, 2014
    Applicant: Max Sound Corporation
    Inventors: Lloyd Trammell, Greg Halpern
  • Publication number: 20140355776
    Abstract: Provided are an interested audio source cancellation method, a voice recognition method using the interested audio source cancellation method, computer-readable recording media recording programs for implementing the methods, and a voice recognition apparatus for performing voice recognition by using the interested audio source cancellation method. The interested audio source cancellation method includes steps of: receiving input mixed signals from two microphones and transforming the signals into a time-frequency domain through short-term Fourier transformation; setting an interested audio source cancellation vector for cancelling an interested audio source signal from the input mixed signals in the time-frequency domain; and generating a mixed noise signal by cancelling the interested audio source signal from the input mixed signals by using the interested audio source cancellation vector.
    Type: Application
    Filed: December 17, 2012
    Publication date: December 4, 2014
    Inventors: Hyung Min Park, Myung Woo Oh
  • Publication number: 20140301558
    Abstract: Systems and methods are described to reduce undesired audio. An adaptive noise cancellation unit receives a main signal and a reference signal. The main signal has a main signal-to-noise ratio; the reference signal has a reference signal-to-noise ratio. The reference signal-to-noise ratio is less than the main signal-to-noise-ratio. The adaptive noise cancellation unit reduces undesired audio from the main signal. An output signal from the adaptive noise cancellation unit is input to a single channel noise cancellation unit. The single channel noise cancellation unit further reduces undesired audio from the output signal to provide mostly desired audio. A filter control creates a control signal from the main signal and the reference signal to control filtering in the adaptive noise cancellation unit and to control filtering in the single channel noise cancellation unit.
    Type: Application
    Filed: March 12, 2014
    Publication date: October 9, 2014
    Applicant: KOPIN CORPORATION
    Inventor: Dashen Fan
  • Patent number: 8855329
    Abstract: An active noise control (ANC) system may be implemented to both sides of a fan, such that both directions of the noise emitting are treated to reduce the overall noise. The impact on airflow is minimal, and the technique is very effective in a broad range of low frequencies. Passive sound-absorbing materials may be included for attenuation of high frequencies. The resulting quiet fan produces a low level of noise compared to any other device based on fan, which produces the same capacity of airflow. The quiet fan may be incorporated in any mechanical system which requires airflow induction such as: computers, air conditioners, machines, and more.
    Type: Grant
    Filed: January 20, 2008
    Date of Patent: October 7, 2014
    Assignee: Silentium Ltd.
    Inventors: Alon Slapak, Tzvika Fridman, Ofira Rubin
  • Patent number: 8848938
    Abstract: A loudspeaker arrangement in a motor vehicle includes at least one loudspeaker, which is able to be driven by an audio processor, the loudspeaker being arranged as at least one electrostatic planar loudspeaker.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: September 30, 2014
    Assignee: Volkswagen AG
    Inventor: Holger Opfer
  • Patent number: 8842851
    Abstract: Systems and methods are described that perform audio source localization in a manner that provides increased robustness and responsiveness in the presence of acoustic echo. The systems and methods calculate a difference between a signal level associated with one or more of the audio signals generated by a microphone array and an estimated level of acoustic echo associated with one or more of the audio signals. This information is then used to determine whether and/or how to perform audio source localization. For example, a controller may use the difference to determine whether or not to freeze an audio source localization module that operates on the audio signals. As another example, the audio source localization module may incorporate the difference (or the estimated level of acoustic echo used to calculate the difference) into the logic that is used to determine the location of a desired audio source.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: September 23, 2014
    Assignee: Broadcom Corporation
    Inventor: Franck Beaucoup
  • Patent number: 8836516
    Abstract: Health-sensing and health-action devices and systems are generally described. The health-sensing device may include one or more of a sensor, a filter, and a transmitter. The sensor may be configured to sense one or more factors relating to an indicator of a health related condition or occurrence such as snoring and may include one or more microphone devices, accelerometers, and/or MEMs devices. The filter may be configured to evaluate a signal from the sensor and determine if the indicator has been detected. The transmitter may be arranged for initiating a transmission based on a signal from the filter. The health-action device may be configured for responding to an indicator of a health related condition or occurrence of a user and may include one or more of a receiver, a processor, and a responder. The health-action device may stimulate the user or may cancel the snoring sound.
    Type: Grant
    Filed: May 7, 2012
    Date of Patent: September 16, 2014
    Assignee: Empire Technology Development LLC
    Inventors: Andrew Wolfe, Thomas Martin Conte
  • Patent number: 8798992
    Abstract: An signal processing apparatus, system and software product for audio modification/substitution of a background noise generated during an event including, but not be limited to, substituting or partially substituting a noise signal from one or more microphones by a pre-recorded noise, and/or selecting one or more noise signals from a plurality of microphones for further processing in real-time or near real-time broadcasting.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: August 5, 2014
    Assignee: Disney Enterprises, Inc.
    Inventors: Michael Gay, Jed Drake, Anthony Bailey
  • Publication number: 20140205106
    Abstract: Instrument amplification systems incorporating reflection cancelling boundary microphones and multiband compression in accordance with embodiments of the invention are disclosed.
    Type: Application
    Filed: January 23, 2014
    Publication date: July 24, 2014
    Inventors: Thomas Linn, Lloyd Baggs
  • Patent number: 8750531
    Abstract: This document discusses, among other things, systems and methods for active noise cancellation. One example system includes a digital ANC circuit configured to receive first audio information from a first microphone and to produce an a digital anti-noise signal configured to attenuate noise sensed by the first microphone; an analog ANC circuit configured to receive second audio information from a second microphone and to produce an analog anti-noise signal configured to attenuate noise sensed by the second microphone; and wherein the system is configured to receive an intended audio signal and to provide an output signal for a speaker using the intended audio signal, the analog anti-noise signal, and the digital anti-noise signal.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: June 10, 2014
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Cary L. Delano, Steven M. Waldstein
  • Patent number: 8737633
    Abstract: A noise cancellation system is provided, for generating a noise cancellation signal to be added to a wanted signal to mitigate the effects of ambient noise. The system comprises: an input, for receiving an input signal representing ambient noise; a detector, for detecting a magnitude of said input signal; and a voice activity detector, for determining voiceless periods when said input signal does not contain a signal representing a voice. The detector is adapted to detect the magnitude of said input signal during said voiceless periods, and the system is adapted to operate in a first mode when said input signal is above a threshold value, and a second mode when said input signal is below the threshold value. The first mode comprises generating a noise cancellation signal with a first magnitude for at least partially cancelling the ambient noise. The second mode comprises generating a noise cancellation signal with a second magnitude that is less than the first magnitude.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: May 27, 2014
    Assignee: Wolfson Microelectronics plc
    Inventors: Alastair Sibbald, Robert David Alcock
  • Patent number: 8712070
    Abstract: A method and apparatus for providing simultaneous enhancement of transmission loss and absorption coefficient using activated cavities is presented. A layer of material is provided, and a backing plate having a plurality of cavities on the top surface of said backing plate, is disposed adjacent a top surface of said layer of material. A screen is disposed along the top surface of said cavities on said backing plate and at least one cavity includes an actuator disposed within the cavity and a control system receiving a signal from the microphone and receiving a signal from the accelerometer and providing a drive signal to the actuator to provide an acoustic output to provide simultaneous insertion loss and absorption which serves to minimize a linear combination of the signal from the microphone and the signal from the accelerometer.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: April 29, 2014
    Assignee: Raytheon Company
    Inventors: Paul James Remington, Alan Robert Douglas Curtis, Istvan L. Ver
  • Patent number: 8705760
    Abstract: The active noise control device includes: a signal obtaining section that obtains an electric signal relating to the predetermined sound; a control section that adjusts an amplitude and a phase of the electric signal obtained by the signal obtaining section; a vibrating section having a diaphragm and a vibrator, the vibrator vibrating in accordance with an output from the control section. Because a sound radiated from the diaphragm toward the first region is substantially in opposite phase to that toward the second region, the control section controls the vibrator so that the diaphragm generates a sound that attenuates the predetermined sound in the first region, and causes the predetermined sound to have a desired frequency characteristic in the second region.
    Type: Grant
    Filed: March 17, 2010
    Date of Patent: April 22, 2014
    Assignee: Panasonic Corporation
    Inventor: Ko Mizuno
  • Patent number: 8693700
    Abstract: In an aspect, the invention features an active noise reduction device including an electronic signal processing circuit. The electronic signal processing circuit includes a first input for accepting a first signal, a second input for accepting a second signal, an output for providing a third signal, a feed-forward path from the first input to the output, and a feed-forward controller for determining the control parameter by calculating a control signal using the first signal and the second signal and then using the control signal to determine the control parameter. The feed-forward path includes a fixed compensation linear filter and a variable compensation filter having an input for receiving a control parameter that applies a selected linear filter from a family of linear filters that vary in both gain and spectral shape and are selectable by the control parameter.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: April 8, 2014
    Assignee: Bose Corporation
    Inventors: Pericles Bakalos, Anand Parthasarathi
  • Patent number: 8682018
    Abstract: Microphone arrays (MAs) are described that position and vent microphones so that performance of a noise suppression system coupled to the microphone array is enhanced. The MA includes at least two physical microphones to receive acoustic signals. The physical microphones make use of a common rear vent (actual or virtual) that samples a common pressure source. The MA includes a physical directional microphone configuration and a virtual directional microphone configuration. By making the input to the rear vents of the microphones (actual or virtual) as similar as possible, the real-world filter to be modeled becomes much simpler to model using an adaptive filter.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: March 25, 2014
    Assignee: AliphCom
    Inventor: Gregory C. Burnett
  • Patent number: 8649539
    Abstract: A method for processing the signals from two or more microphones in a listening device, and a listening device for conducting the method which has a casing holding the microphones, a signal processing unit which provides an output signal corresponding to the microphone signals and suited to the user's hearing, and a receiver unit for delivering the output signal to the user whereby the signals from the microphones are analyzed in order to detect when the casing of the listening device is being touched, whereby further the signal processing of the signal processing unit changes whenever touching of the casing is detected.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: February 11, 2014
    Assignee: Oticon A/S
    Inventor: Kim S. Petersen
  • Patent number: 8649530
    Abstract: An array speaker system canceling non-uniform radiation patterns and a method for implementing the same are provided. The method for canceling non-uniform radiation patterns includes predicting radiation patterns in an array speaker with respect to input signals, generating cancellation signals with respect to at least one region corresponding to non-uniform radiation patterns of the predicted radiation patterns, synthesizing the input signals and the cancellation signals, and outputting the synthesized signals to the array speaker. Sound signals from which non-uniform radiation patterns having distorted sound are cancelled such that a stable sound field having uniform radiation characteristics may be obtained and provided to a listener.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: February 11, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Young-tae Kim, Jung-ho Kim, Seng-chul Ko
  • Patent number: 8644521
    Abstract: An active noise cancellation system includes an adaptive filter, a signal source, an acoustic actuator, a microphone, a secondary path and an estimation unit. The adaptive filter receives a reference signal representing noise, and provides a compensation signal in response to the received reference signal. The signal source provides a measurement signal. The acoustic actuator radiates the compensation signal and the measurement signal to the listening position. The microphone receives a first signal that is a superposition of the radiated compensation signal, the radiated measurement signal, and the noise signal at the listening position, and provides a microphone signal in response to the received first signal. The secondary path includes a secondary path system that represents a signal transmission path between an output of the adaptive filter and an output of the microphone.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: February 4, 2014
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Michael Wurm
  • Patent number: 8630424
    Abstract: An Active Noise Control (ANC) for controlling a noise produced by a noise source may include an acoustic sensor (212) to sense a noise pattern and to produce a noise signal corresponding to the sensed noise pattern, an estimator (202) to produce a predicted noise signal by applying an estimation function to the noise signal, and an acoustic transducer (216) to produce a noise destructive pattern based on the predicted noise signal.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: January 14, 2014
    Assignee: Silentium Ltd.
    Inventors: Alon Slapak, Yehuda Meiman, Gedalin Konstantin
  • Patent number: 8625812
    Abstract: An acoustic management system configured to compensate for acoustical dampening is provided. The system includes a microphone configured to detect a first acoustic signal from an acoustic environment and a logic circuit. The logic circuit detects an onset of the acoustical dampening between the acoustic environment and the microphone. The logic circuit generates an acoustic damping compensation filter, which is applied to the first acoustic signal to generate a drive signal.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: January 7, 2014
    Assignee: Personics Holdings, Inc
    Inventors: Steven W. Goldstein, John Usher, John P. Keady
  • Patent number: 8577045
    Abstract: An encoding apparatus comprises a frame processor (105) which receives a multi channel audio signal comprising at least a first audio signal from a first microphone (101) and a second audio signal from a second microphone (103). An ITD processor 107 then determines an inter time difference between the first audio signal and the second audio signal and a set of delays (109, 111) generates a compensated multi channel audio signal from the multi channel audio signal by delaying at least one of the first and second audio signals in response to the inter time difference signal. A combiner (113) then generates a mono signal by combining channels of the compensated multi channel audio signal and a mono signal encoder (115) encodes the mono signal. The inter time difference may specifically be determined by an algorithm based on determining cross correlations between the first and second audio signals.
    Type: Grant
    Filed: September 9, 2008
    Date of Patent: November 5, 2013
    Assignee: Motorola Mobility LLC
    Inventor: Jonathan A. Gibbs
  • Patent number: 8571240
    Abstract: Adjustments to an electro-acoustic transducer may be made to match the performance of a second electro-acoustic transducer such that a net inertial force generated by movement of the electro-acoustic transducers' diaphragms are substantially zero. Adjustments may include adjusting a moving mass of one of the elector-acoustic transducers. Adjustments may include applying an equalization to one of the electro-acoustic transducers.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: October 29, 2013
    Assignee: Bose Corporation
    Inventors: Kevin J. Bastyr, Michael W. Stark
  • Patent number: 8553898
    Abstract: A method of increasing the intelligibility of an audio broadcast in an at least partially enclosed space from at least one amplified audio source. An input microphone receives an incident audio wavefront at a first position in the at least partially enclosed space. An active noise control system is employed to generate a cancelling audio wavefront having a magnitude substantially equal to the magnitude of incident audio wavefront and a phase substantially opposite to the phase of the incident audio wavefront. The cancelling audio wavefront is broadcast at a second position in the at least partially enclosed space adjacent to a reflective surface of the at least partially enclosed space so as to attenuate the incident audio wavefront substantially at or near the reflective surface in order to reduce reverberations of the incident audio wavefront. In this manner, reverberations which could reduce the intelligibility of the audio broadcast to an audience is reduced.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: October 8, 2013
    Inventor: Emmet Raftery
  • Patent number: 8526627
    Abstract: A noise reduction device of the present invention comprises a control filter unit for generating a control sound signal to cancel out a noise, a control speaker for outputting a control sound according to the control sound signal from the control filter unit, an error microphone for detecting a residual sound by superimposing the noise upon the control sound output from the control speaker, and an obstacle detector for detecting an obstacle around the error microphone, wherein the control filter unit generates the control sound signal according to data from the error microphone and the obstacle detector.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: September 3, 2013
    Assignee: Panasonic Corporation
    Inventors: Yoshifumi Asao, Tsuyoshi Maeda
  • Publication number: 20130216059
    Abstract: Provided are an apparatus and method for reducing digital noise. The digital noise reducing apparatus includes: a clarified signal generator configured to generate a clarity improvement pattern for increasing an energy ratio of an early reflection region with respect to all reverberations for a received audio source signal, to convolve the clarity improvement pattern with the audio source signal, and to output an audio source signal convolved the audio source signal with the clarity improvement pattern; an early reflection generator configured to output an early reflection signal convolved the audio source signal with an early reflection pattern; a late reverberation generator configured to receive the audio source signal, and to generate a late reverberation signal for attenuating digital noise of the audio source signal; and a noise attenuator configured to generate an audio signal added the early reflection signal and the late reverberation signal to the audio source signal.
    Type: Application
    Filed: February 15, 2013
    Publication date: August 22, 2013
    Applicant: RADSONE lnc.
    Inventor: RADSONE lnc.
  • Patent number: 8509465
    Abstract: A system of signal processing an input signal in a hearing aid to avoid entrainment, the hearing aid including a receiver and a microphone, the method comprising using a transform domain adaptive filter including two or more eigenvalues to measure an acoustic feedback path from the receiver to the microphone, analyzing a measure of eigenvalue spread against a predetermined threshold for indication of entrainment of the transform domain adaptive feedback cancellation filter, and upon indication of entrainment of the transform domain adaptive feedback cancellation filter, modulating the adaptation of the transform domain adaptive feedback cancellation filter.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: August 13, 2013
    Assignee: Starkey Laboratories, Inc.
    Inventor: Lalin Theverapperuma
  • Publication number: 20130195282
    Abstract: An active vibration noise control device is preferably used for canceling a vibration noise by making a speaker generate a control sound. Concretely, the active vibration noise control device includes an attenuating unit which attenuates a control signal generated by an adaptive notch filter, and provides the attenuated control signal to the speaker, when amplitude of a filter coefficient is larger than a threshold. Therefore, it is possible to suppress continuous ups and downs of the filter coefficient during an occurrence of an abnormality. Hence, it becomes possible to appropriately suppress an occurrence of a cyclic abnormal sound and an increase in the vibration noise during the occurrence of the abnormality.
    Type: Application
    Filed: April 9, 2010
    Publication date: August 1, 2013
    Applicant: PIONEER CORPORATION
    Inventors: Yoshiki Ohita, Manabu Nohara, Yusuke Soga, Shin Hasegawa, Hisashi Kihara
  • Patent number: 8494175
    Abstract: A noise reduction device is disclosed, in which noise reduction device, a controlling sound generator outputs a white noise generated by a white-noise generator, and this white noise is sensed by an error sensor for identifying an acoustic transmission function covering a path from the controlling sound generator to the error sensor. At this time, an identification controller prompts the white noise generator to generate a white noise for identifying the acoustic transmission function provided that an ambient noise level sensed by the error sensor is not greater than a given threshold.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: July 23, 2013
    Assignee: Panasonic Corporation
    Inventors: Tsuyoshi Maeda, Yoshifumi Asao
  • Patent number: 8485309
    Abstract: An apparatus for damping acoustic waves that includes a volume of fluid having actively excited acoustic waves, an enclosure disposed in the volume of fluid including delimiting surfaces which define a cavity, at least one of the delimiting surfaces being permeable to the fluid, such that fluid may be exchanged between the cavity and the volume, and at least one sound producer disposed proximate the cavity to actively excite the actively excited acoustic waves in the fluid disposed in the cavity such that acoustic waves are damped in the volume.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: July 16, 2013
    Assignee: Deutsches Zentrum fur Luft-und Raumahrt E.V.
    Inventors: Stefan Busse, Claus Heuwinkel, Lars Enghardt, Ingo Röhle
  • Patent number: 8477956
    Abstract: A howling suppression device that can reduce quality deterioration of processed sound includes: a delay unit delaying the input signal to output the delayed input signal as a reference signal; a signal separation unit including an adaptive filter extracting a periodic signal component from the reference signal by adaptively updating a filter coefficient; a howling detection unit detecting an occurrence of howling using at least a signal of the periodic signal component output from the adaptive filter; and a howling suppression unit. The howling suppression unit includes: a suppression filter obtaining the updated filter coefficient from the adaptive filter with timing when the howling detection unit detects the occurrence of the howling, to extract the periodic signal component from the reference signal based on the filter coefficient; and a subtractor subtracting the periodic signal component from the input signal so as to output a signal obtained by the subtraction.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: July 2, 2013
    Assignee: Panasonic Corporation
    Inventor: Takefumi Ura
  • Patent number: 8453788
    Abstract: A method, system and computer program product are provided for implementing dynamic noise elimination. A system frame includes a plurality of acoustical sensory devices monitoring the system for problem frequencies. The system frame includes a plurality of tubes. When the tube is open, airflow is allowed. When identified tubes are closed, quarter-wavelength attenuation is provided for a frequency in a range of frequencies, based upon a length of the tube when closed. Each of the plurality of tubes is selectively controlled to be operable open or closed at a particular length, responsive to identified problem frequencies.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: June 4, 2013
    Assignee: International Business Machines Corporation
    Inventors: Cary M. Huettner, Joseph Kuczynski, Robert Ernst Meyer, III, Michael D. O'Connell, Timothy J. Tofil
  • Patent number: 8379879
    Abstract: An active noise reduction system is provided for receiving an audio input signal and a noise interference signal and calculating an audio broadcasting signal according to a Feedback Filtered-X Least-Mean-Square (FFXLMS) algorithm, wherein the FFXLMS algorithm optimizes a (convergence factor) ? so as to decrease the numbers of divisions operated by the active noise reduction system and increase the operation speed of the active noise reduction system.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: February 19, 2013
    Assignee: Chung Yuan Christian University
    Inventors: Cheng-Yuan Chang, Sheng-Ting Li