Algorithm Or Formula (e.g., Lms, Filtered-x, Etc.) Patents (Class 381/71.12)
  • Patent number: 11367427
    Abstract: A design method for feedforward active noise control system is disclosed. Based on a target signal and a reference signal, a first adaptive system identifying unit is enabled to complete a first system identification process for producing a first adaptive filter, and then a second adaptive system identifying unit is enabled to complete a second system identification process for producing a second adaptive filter. After the second adaptive filter is converted to a digitally-controlled filter by using a system identification tool, the digitally-controlled filter is implemented into a DSP chip of a feedforward active noise control system. As a result, it is able to find that not only the computing loading of the DSP chip is significantly lowered while an adaptive algorithm executes an active noise control computing, but also the feedforward active noise control system exhibits a broad frequency bandwidth noise cancelling ability.
    Type: Grant
    Filed: May 6, 2021
    Date of Patent: June 21, 2022
    Assignee: Chung Yuan Christian University
    Inventors: Cheng-Yuan Chang, Sen-Maw Kuo, Chong-Rui Huang
  • Patent number: 11335314
    Abstract: Adaptive filters output a cancellation sound from a speaker, a selector selects outputs of a plurality of auxiliary filters each corresponding to different positions, a subtractor subtracts the selected output from the output of the microphone and outputs the subtracted output to the adaptive filter as an error signal, and a position detection device detects a position of a head of a user. A transfer function estimated so that the error signal becomes 0 when noise is canceled at the corresponding position is preset in the auxiliary filter. When the auxiliary filter corresponding to the position close to the head of the user changes, the switching control unit stepwise increases the frequency with which the output of the auxiliary filter is selected by the selector to 100%.
    Type: Grant
    Filed: May 21, 2020
    Date of Patent: May 17, 2022
    Assignees: ALPINE ELECTRONICS, INC., A SCHOOL CORPORATION KANSAI UNIVERSITY
    Inventors: Ryosuke Tachi, Yoshinobu Kajikawa
  • Patent number: 11051094
    Abstract: An acoustical cap that covers a microphone and allows a user to adjust the frequency response of the sound that the microphone receives. The acoustical cap has at least two different inlets that connect to respective cavities. These inlets and their associated cavities form resonators that have different frequency responses. Because the microphone cap has multiple resonators, a user is able to quickly and easily adjust the frequency response of the sound that the microphone receives by adjusting the orientation of the acoustical cap instead of having to carry multiple acoustical caps.
    Type: Grant
    Filed: October 25, 2019
    Date of Patent: June 29, 2021
    Assignee: Shore Acquisition Holdings, Inc.
    Inventor: Jordan Schultz
  • Patent number: 11024279
    Abstract: A noise cancelation system for an unmanned aerial vehicle may have an audio capture module, a metadata module and a filter. The audio capture module may be configured to receive an audio signal captured from a microphone, e.g., on a camera. The metadata module may be configured to retrieve noise information associated with noise generating components operating on the unmanned aerial vehicle (UAV). The filter may be configured to receive the audio signal and noise information from the audio capture module. The filter also may be configured to retrieve a baseline profile from a database based on the noise information. The baseline profile includes noise parameter to filter out audio frequencies from the audio signal corresponding to the noise generating component. The filter may generate a filtered audio signal for output.
    Type: Grant
    Filed: January 24, 2020
    Date of Patent: June 1, 2021
    Assignee: GoPro, Inc.
    Inventor: Gary Fong
  • Patent number: 10993025
    Abstract: The implementations described include an audio canceling device that receives and audio signal from within an environment, identifies desired and undesired audio from the received audio signal and generates an attenuation-signal for use in canceling out or reducing the volume of the undesired audio at a canceling location. In addition, the audio canceling device, may determine a time delay before the attenuation-signal should be transmitted from an output based on a distance between the undesired audio source location and the canceling location and a distance between the output and the canceling location.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: April 27, 2021
    Assignee: Amazon Technologies, Inc.
    Inventor: William Spencer Worley, III
  • Patent number: 10964303
    Abstract: A vehicular apparatus for active noise control may include: a sensing unit configured to sense information characterizing at least one of an environment inside of a vehicle and an environment outside of the vehicle; and a controller configured extract road roughness information characterizing road roughness from the sensed information, to calculate a convergence coefficient based on the road roughness information, to generate a control signal by applying the convergence coefficient to a control filter coefficient, and to perform active noise control using the control signal.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: March 30, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventor: Byoung Ho Kwon
  • Patent number: 10904686
    Abstract: A method of acoustic tuning includes: outputting, with a first speaker among a plurality of speakers in different locations on an aircraft cabin, a first sound; detecting, with a plurality of microphones in different locations of the cabin, first reflected sounds of the first sound; outputting, with a second speaker among the plurality of speakers, a second sound; detecting, with the plurality of microphones, second reflected sounds of the second sound; comparing, with a server connected to the speakers and the microphones, the first sound and the second sound with each of the first reflected sounds and each of the second reflected sounds, respectively; and adjusting an output gain and frequency phase of each of the plurality of speakers based on the comparisons between the first sound and each of the first reflected sounds and between the second sound and each of the second reflected sounds.
    Type: Grant
    Filed: July 3, 2019
    Date of Patent: January 26, 2021
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Sasha Dean-Bhïyan, Renato Seiji Morita, Victor-Daniel Gheorghian
  • Patent number: 10741162
    Abstract: An active noise cancellation (ANC) system may include provisions for validating the accuracy of a modeled transfer characteristic stored in secondary path filters, which provides an estimate of the secondary path (i.e., the transfer function between a speaker and an error microphone). Using estimated anti-noise or music signals to adjust an error signal from the error microphone, a signal analysis controller may detect ANC instability or noise boosting. Such noise boosting may indicate the stored transfer characteristic in the secondary path filter does not accurately represent the actual secondary path. According, upon detection of noise boosting, the stored transfer characteristic of the secondary path filters may be modified.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: August 11, 2020
    Assignee: HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED
    Inventor: Kevin J. Bastyr
  • Patent number: 10715917
    Abstract: A system and method is configured to generate a sound wave field around a listening position in a target loudspeaker-room-microphone system in which a loudspeaker array of K?1 groups of loudspeakers is disposed around the listening position, and a microphone array of M?1 groups of microphones is disposed at the listening position. The system and method include equalizing filtering with controllable transfer functions in signal paths upstream of the K groups of loudspeakers. The system and method further include controlling with equalization control signals of the controllable transfer functions for equalizing filtering according to an adaptive control algorithm based on error signals and an input signal. The microphone array includes at least two first groups of microphones that are annularly disposed around a listener's head, around or in an artificial head or around or in a rigid sphere.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: July 14, 2020
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Leander Scholz
  • Patent number: 10672378
    Abstract: An active noise cancellation (ANC) system may include an adaptive filter divergence detector for detecting divergence of the one or more controllable filters as they adapt, based on dynamically adapted thresholds. Upon detection of a controllable filter divergence, the ANC system may be deactivated, or certain speakers may be muted. Alternatively, the ANC system may modify the diverged controllable filters to restore proper operation of the noise cancelling system.
    Type: Grant
    Filed: May 7, 2019
    Date of Patent: June 2, 2020
    Assignee: HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED
    Inventors: Kevin J. Bastyr, James May, David Trumpy
  • Patent number: 10636404
    Abstract: The invention relates to a method for compensating for interfering noises in a hands-free apparatus in a motor vehicle as well as a hands-free apparatus in a motor vehicle, comprising at least one microphone, at least one loudspeaker, a control device with at least one adaptive filter as well as a transmitting and receiving apparatus, wherein a pre-filter is arranged before the adaptive filter or predetermined filter coefficients (w[n]) are saved in the adaptive filter, wherein the filter coefficients (w[n]) minimize a vehicle-specific acoustic error signal of the vehicle interior.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: April 28, 2020
    Assignee: VOLKSWAGEN ATIENGESELLSCHAFT
    Inventor: Simon Bork
  • Patent number: 10634076
    Abstract: Systems and methods for reducing noise or vibration generated by an internal combustion engine are described. An engine controller is arranged to operate the working chambers of the engine in a cylinder output level modulation manner A noise/vibration reduction unit actively control of a device that is not a part of the powertrain. The device is controlled in a feed forward manner to alter an NVH characteristic of the vehicle in a desired manner based at least in part on a characteristic of the cylinder output level modulation operation of the engine.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: April 28, 2020
    Assignee: Tula Technology, Inc.
    Inventors: Louis J. Serrano, Vijay Srinivasan, Geoffrey Routledge, Mark A. Shost, Biswa R. Ghosh, Mark A. Wilcutts, Matthew A. Younkins, Ying Ren
  • Patent number: 10546571
    Abstract: A noise cancelation system for an unmanned aerial vehicle may have an audio capture module, a metadata module and a filter. The audio capture module may be configured to receive an audio signal captured from a microphone, e.g., on a camera. The metadata module may be configured to retrieve noise information associated with noise generating components operating on the unmanned aerial vehicle (UAV). The filter may be configured to receive the audio signal and noise information from the audio capture module. The filter also may be configured to retrieve a baseline profile from a database based on the noise information. The baseline profile includes noise parameter to filter out audio frequencies from the audio signal corresponding to the noise generating component. The filter may generate a filtered audio signal for output.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: January 28, 2020
    Assignee: GoPro, Inc.
    Inventor: Gary Fong
  • Patent number: 10469945
    Abstract: A system and method are configured to generate a sound wave field around a listening position in a target loudspeaker-room-microphone system in which a loudspeaker array of K?1 groups of loudspeakers, with each group of loudspeakers having at least one loudspeaker, is disposed around the listening position, and a microphone array of M?1 groups of microphones, with each group of microphones having at least one microphone, is disposed at the listening position. The system and method include equalizing filtering with controllable transfer functions in signal paths upstream of the K groups of loudspeakers and downstream of an input signal path, and controlling with equalization control signals of the controllable transfer functions for equalizing filtering according to an adaptive control algorithm based on error signals from the M groups of microphones and an input signal on the input signal path.
    Type: Grant
    Filed: April 6, 2015
    Date of Patent: November 5, 2019
    Assignee: HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH
    Inventor: Markus Christoph
  • Patent number: 10460718
    Abstract: A feedforward ambient noise reduction arrangement includes, within a housing, a loudspeaker device for directing sound energy into an ear of a listener. Disposed externally of the housing, and positioned to sense ambient noise on its way to the listener's ear, are plural microphone devices capable of converting the sensed ambient noise into electrical signals for application to the loudspeaker to generate an acoustic signal opposing the ambient noise. Importantly, the overall arrangement is such that the acoustic signal is generated by said loudspeaker means in substantial time alignment with the arrival of said ambient noise at the listener's ear.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: October 29, 2019
    Assignee: Cirrus Logic, Inc.
    Inventor: Alastair Sibbald
  • Patent number: 10418021
    Abstract: A noise reduction device is connectable to a plurality of sound acquisition devices and a plurality of control sound output devices for reducing noises in a given space where seats are arranged and a sound field can be formed. The device includes a sound receiver, a processor, a control sound transmitter. The sound receiver receives a sound signal from at least two of the plurality of sound acquisition devices. The processor detects a state change of the sound field, and generates a control sound signal for reducing noise with respect to the sound signal. The control sound transmitter outputs the control sound signal to each of control sound output devices. The processor acquires, for example, seat information for specifying the reclining state of a seat. The processor controls the generation of the control sound signal based on the change of state of the sound field including the seat information.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: September 17, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takahiro Yamaguchi, Toshihiro Ezaki
  • Patent number: 10386212
    Abstract: A system and method for simulating activity of a fluid in a volume that represents a physical space, the activity of the fluid in the volume being simulated so as to model movement of elements within the volume. The method includes at a first time, identifying a first set of vortices in a transient and turbulent flow. The method includes at a second time that is subsequent to the first time, identifying a second set of vortices. The method includes tracking changes in the vortices by comparing the first set and the second set of discrete vortices. The method includes identifying one or more noise sources based on the tracking. The method includes determining the contribution of one or more noise sources at a receiver. The method also includes outputting data indicating one or more modifications to one or more geometric features of a device or an entity.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: August 20, 2019
    Assignee: Dassault Systemes Simulia Corp.
    Inventors: Adrien Mann, Franck Léon Pérot
  • Patent number: 10351262
    Abstract: Techniques for using a sound spectrum to generate models, which identify unmanned aerial vehicle (UAV) configurations, are described herein. The models may be based on components associated with a UAV, and instructions for manufacture of a UAV may be provided. For example, a sound spectrum may be obtained by a computer system which is used to generate one or more models. The one or more models are based in part on components of a UAV and identify UAV configurations that will generate an expected sound within the identified sound spectrum. The UAV configurations identified by the models are used to instruct manufacture of a UAV.
    Type: Grant
    Filed: August 5, 2016
    Date of Patent: July 16, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Brian C. Beckman, Gur Kimchi
  • Patent number: 10332502
    Abstract: A noise reducing device includes: an acoustic-to-electric conversion section for collecting noise and outputting an analog noise signal; an analog-to-digital conversion section for converting the analog noise signal into a digital noise signal; and a digital processing section for generating a digital noise reducing signal on a basis of the digital noise signal and a desired parameter. The device further includes: a retaining section for retaining a plurality of parameters corresponding to a plurality of kinds of noise characteristics; a setting section for setting one of the plurality of parameters as the desired parameter of the digital processing section; a digital-to-analog conversion section for converting the digital noise reducing signal into an analog noise reducing signal; and an electric-to-acoustic conversion section for outputting noise reducing sound on a basis of the analog noise reducing signal.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: June 25, 2019
    Assignee: SONY CORPORATION
    Inventor: Kohei Asada
  • Patent number: 10327061
    Abstract: Example techniques may involve controlling a passive radiator. An implementation may include a device playing back an input signal representing audio content via one or more active speakers. The device measures excursion of the passive radiator when the input signal is played back via the one or more active speakers. The device limits excursion of the passive radiator to less than an excursion limit when certain input causes the passive radiator to move beyond the excursion limit.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: June 18, 2019
    Assignee: Sonos, Inc.
    Inventor: Tony Doy
  • Patent number: 10192538
    Abstract: A mobile body includes a driving mechanism, a speaker, and a control unit. The driving mechanism supplies power moving the mobile body. The control unit generates from the speaker a sound wave canceling a driving sound generated from the driving mechanism.
    Type: Grant
    Filed: July 21, 2017
    Date of Patent: January 29, 2019
    Assignee: SONY INTERACTIVE ENTERTAINMENT INC.
    Inventors: Takeshi Yamagishi, Osamu Ota
  • Patent number: 10174653
    Abstract: Aspects of the present invention relate to noise modification systems of motor vehicles, and controllers and methods of use thereof.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: January 8, 2019
    Assignee: JAGUAR LAND ROVER LIMITED
    Inventors: Dean Petley, Simon Fletcher
  • Patent number: 10176792
    Abstract: The implementations described include an audio canceling device that receives an unmanned aerial vehicle (“UAV”) audio signature representative of audio generated by an unmanned aerial vehicle, monitors audio within an environment in which the audio canceling device is located for audio generated by the UAV, generates an attenuation-signal based on detected audio generated by the UAV, and outputs the attenuation-signal to attenuate the audio generated by the UAV. In one example, the audio canceling device may be used to attenuate audio generated by a UAV that is permeating into a user's home during delivery of an item to the user's home by the UAV.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: January 8, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Michael John Elzinga, Scott Michael Wilcox
  • Patent number: 10115387
    Abstract: A noise-reduction control method includes performing frequency-domain weighting and temporal-domain weighting to a noise signal collected at current time to obtain a weighted energy. Judging whether active noise-reduction control is needed based on the weighted energy; calculating an energy value of a first sub-band and an energy value of a second sub-band of the noise signal collected by the feedforward microphone at the current time, wherein the first sub-band and the second sub-band are determined based on a feedforward noise-reduction curve and a feedback noise-reduction curve of the earphone, respectively. Determining a feedforward noise-reduction amount and a feedback noise-reduction amount based on the energy value of the first sub-band and the energy value of the second sub-band, respectively.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: October 30, 2018
    Assignee: Goertek Inc.
    Inventors: Song Liu, Linzhang Wang, Bo Li
  • Patent number: 10091597
    Abstract: An off-head detection system for an in-ear headset comprises an input device that receives an audio signal, a feed-forward microphone signal, and a driver output signal; an expected-output computation circuit that predicts a value of the driver output signal based on a combination of the audio signal and the feed-forward microphone signal from the signal monitoring circuit, and off-head data from the off-head model; and a comparison circuit that compares the observed output signal provided to the driver and the computed expected output to determine an off-head state of the in-ear headset.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: October 2, 2018
    Assignee: BOSE CORPORATION
    Inventors: Ryan Termeulen, Jahn Dmitri Eichfeld, Fernando Mier, Andrew Sabin
  • Patent number: 10091598
    Abstract: An off-head detection system for an in-ear headset comprises an input device that receives an audio signal, a feed-forward microphone signal, and a driver output signal; an expected-output computation circuit that predicts a value of the driver output signal based on a combination of the audio signal and the feed-forward microphone signal from the signal monitoring circuit, and off-head data from the off-head model; and a comparison circuit that compares the observed output signal provided to the driver and the computed expected output to determine an off-head state of the in-ear headset.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: October 2, 2018
    Assignee: BOSE CORPORATION
    Inventors: Ryan Termeulen, Jahn Dmitri Eichfeld, Fernando Mier, Andrew Sabin
  • Patent number: 10060310
    Abstract: Aspects of the present invention relate to an active noise system, a controller for an active noise system, a method and a hybrid electric vehicle. The invention relates to use of an active noise system for providing noise when an ICE is not active.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: August 28, 2018
    Assignee: Jaguar Land Rover Limited
    Inventors: Dean Petley, Simon Fletcher
  • Patent number: 9984672
    Abstract: A noise cancellation system for an unmanned aerial vehicle may have an audio capture module, a metadata module and a filter. The audio capture module may be configured to receive an audio signal captured from a microphone, e.g., on a camera. The metadata module may be configured to retrieve noise information associated with noise generating components operating on the unmanned aerial vehicle (UAV). The filter may be configured to receive the audio signal and noise information from the audio capture module. The filter also may be configured to retrieve a baseline profile from a database based on the noise information. The baseline profile includes noise parameter to filter out audio frequencies from the audio signal corresponding to the noise generating component. The filter may generate a filtered audio signal for output.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: May 29, 2018
    Assignee: GoPro, Inc.
    Inventor: Gary Fong
  • Patent number: 9967655
    Abstract: Example techniques may involve controlling a passive radiator. An implementation may include a device buffering successive samples of audio content. For sets of buffered samples, the device predicts excursion of the passive radiator caused by playback of the respective set of buffered samples by active speakers via a model. The device limits excursion of the passive radiator to less than an excursion limit when certain sets of buffered samples are predicted to cause the passive radiator to move beyond the excursion limit. The device plays back the successive samples of the modified audio content via the active speakers. The device measures excursion of the passive radiator when sets of buffered samples are played back via the active speakers. For sets of samples, the device determines respective differences between the predicted excursion and the measured excursion and adjusts the model to offset determined differences between the predicted and measured excursion.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: May 8, 2018
    Assignee: Sonos, Inc.
    Inventor: Tony Doy
  • Patent number: 9959859
    Abstract: The various embodiments set forth an active noise cancellation system that includes a source separation algorithm. The source separation algorithm enables the identification of acoustic inputs from a particular sound source based on a reference signal generated with one or more microphones. Consequently, the identified acoustic inputs can be cancelled or damped in a targeted listening location via an acoustic correction signal, where the acoustic correction signal is generated based on a sound source separated from the reference signal. Advantageously, the reference signal can be generated with a microphone, even though such a reference signal may include a combination of multiple acoustic inputs. Thus, noise sources that cannot be individually measured, for example with an accelerometer mounted to a vibrating structure, can still be identified and actively cancelled.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: May 1, 2018
    Assignee: HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED
    Inventor: Donald Joseph Butts
  • Patent number: 9928825
    Abstract: The present method comprises: providing a feedforward microphone outside of each earphone of the active noise-reduction earphones; detecting an amount of external noise by using the feedforward microphone; calculating a weighted energy of a noise signal; and determining whether it is needed to activate the active noise-reduction system based on the weighted energy. When the active noise-reduction control is needed, calculating energy values of two sub-bands, corresponding to the feedforward noise-reduction amount and the feedback noise-reduction amount respectively, in the noise signal, thereby determining the noise-reduction amounts of the feedforward noise reduction system and the feedback noise-reduction system, and controlling the earphone to perform corresponding feedforward noise reduction and feedback noise reduction. Compared with the existing active noise-reduction technologies with a fixed noise reduction, the present invention can optimize the noise-reduction effect.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: March 27, 2018
    Assignee: GOERTEK INC.
    Inventors: Song Liu, Linzhang Wang, Bo Li
  • Patent number: 9881602
    Abstract: A sound system for a motor vehicle exhaust gas system for emitting emulated engine sounds, including at least one loudspeaker and at least one housing accommodating at least one loudspeaker. The housing is mounted separately from a motor vehicle exhaust gas system in terms of the routing of an exhaust gas flow, at least one sound guidance tube having an outlet zone being mounted on the housing.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: January 30, 2018
    Assignee: TENNECO GMBH
    Inventors: Dirk Wiemeler, Bernd Schädler
  • Patent number: 9792893
    Abstract: An active noise reduction (ANR) earphone system includes a feedback microphone for detecting noise, feedback circuitry, responsive to the feedback microphone, for applying a digital filter Kfb to an output of the feedback microphone to produce an antinoise signal, an electroacoustic driver for transducing the antinoise signal into acoustic energy, a housing supporting the feedback microphone and the driver near the entrance to the ear canal, and an ear tip for coupling the housing to the external anatomical structures of a first ear of a user and positioning the housing to provide a consistent acoustic coupling of the feedback microphone and the driver to the ear canal of the first ear. The acoustic coupling includes a tube of air defined by the combination of the housing and ear tip, having a length L and effective cross-sectional area A such that the ratio L/A is less than 0.6 m?1.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: October 17, 2017
    Assignee: Bose Corporation
    Inventors: Daniel M. Gauger, Jr., Anand Parthasarathi, Lei Cheng, Matthew R. Hicks, John Allen Rule
  • Patent number: 9786275
    Abstract: The present invention relates to a system for suppressing transient interference from a signal. The system includes a modeling system, wherein the modeling system constructs a model of transient interference from a first signal, and a filtering system, wherein the filtering system suppresses transient interference from a second signal by applying the model to the second signal.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 10, 2017
    Assignee: YALE UNIVERSITY
    Inventors: Ronald R. Coifman, Ali Haddad, Ronen Talmon
  • Patent number: 9788112
    Abstract: An active noise equalization (ANE) system may be run on the existing audio/infotainment system as a software library. The ANE system may share components (e.g., microphones and sensors) with other audio applications. Some ANEs include a complex-domain formulation of a multiple-frequency multiple-channel ANE that requires less memory and processing requirements. The complex-domain system replaces the multiplication of multiple real gains with multiple real signals with a single complex multiplication operation.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: October 10, 2017
    Assignee: 2236008 Ontario Inc.
    Inventors: Mark Robert Every, Kyle Tegan MacDonald, Michael Andrew Percy
  • Patent number: 9779719
    Abstract: A method of operating an audio system in a vehicle includes providing m number of microphones disposed within a passenger compartment of the vehicle. The microphones produce a plurality of microphone signals. Within the passenger compartment of the vehicle, k number of loudspeakers are provided. A plurality of convergence factors ? for use in performing active noise control are estimated. The estimating includes calculating an Eigen value ?(?) of an autocorrelation matrix of a passenger compartment transfer function as ? k ? ( ? ) = A k ? ( ? ) 2 2 , wherein Ak(?) is the frequency response of the passenger compartment transfer function. A frequency ?min of a local minimum of ?(?) is determined. A largest stable value for ?Max(?min) is found by experimentation, wherein a rotational speed of an engine of the vehicle, expressed in revolutions per minute, frpm=2??min. A calibration factor is calculated as L=?(?min)?Max(?min).
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: October 3, 2017
    Assignee: Panasonic Automotive Systems Company of America, Division of Panasonic Corporation of North America
    Inventor: Darrel Ray Judd
  • Patent number: 9721557
    Abstract: Boomless-microphones are described for a wireless helmet communicator with siren signal detection and classification capabilities. An acoustic component receives an audio signal and comprises a left acoustic sensor and a right acoustic sensor. The left acoustic sensor is mountable or attachable to the surface of a left wall of a helmet and the right acoustic sensor is mountable or attachable to the surface of a right wall. A speaker component can generate an echoless audio signal via signal inversion of the audio signal, outputs to a left speaker mountable or attachable to a left ear area of the helmet and a right speaker mountable or attachable to a right ear area of the helmet. A signal enhancement component can increase an intensity of the first audio signal associated with an emergency siren based on a determined proximity of an emitting emergency vehicle or emergency object to the device.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: August 1, 2017
    Assignee: BITWAVE PTE LTD.
    Inventors: Siew Kok Hui, Eng Sui Tan
  • Patent number: 9704470
    Abstract: A self tuned apparatus (100) for active noise control includes a first transducer (105) and a second transducer (110), a noise controlling module (115), a power amplifier (120) and a first loudspeaker (125) and a second loudspeaker (130) coupled to the power amplifier (120). The noise controlling module (115) is coupled to the first transducer (105) and the second transducer (110). The power amplifier (120) is coupled to the noise controlling module (115). Particularly, the noise controlling module (115) employs at least one control algorithm.
    Type: Grant
    Filed: October 1, 2014
    Date of Patent: July 11, 2017
    Assignee: UNIVERSITI PUTRA MALAYSIA
    Inventors: Mohd Kamil Raja Ahmad Raja, Abdulredha Sahib Mouayad, Ghasemi Dehkordi Sepehr
  • Patent number: 9668046
    Abstract: A noise reduction control apparatus and method for detecting a noise signal with a microphone and generating a first control sound for attenuating the noise signal based on control characteristics of a control filter. Further, the first control sound is emitted and measured during a first period. By measuring a sound reflected from an object, a position of the object is estimated. Using the estimated position of the object, the noise is attenuated at the estimated position. Accordingly, it is possible to continuously reduce noise at an estimated position of an object.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: May 30, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventor: Ko Mizuno
  • Patent number: 9632750
    Abstract: Maximum likelihood bit-stream generation and detection techniques are provided using the M-algorithm and Infinite Impulse Response (IIR) filtering. The M-Algorithm is applied to a target input signal X to perform Maximum Likelihood Sequence Estimation on the target input signal X to produce a digital bit stream B, such that after filtering by an IIR filter, the produced digital stream Y produces an error signal satisfying one or more predefined requirements. The predefined requirements comprise, for example, a substantially minimum error. In an exemplary bit detection implementation, the target input signal X comprises an observed analog signal and the produced digital stream Y comprises a digitized output of a receive channel corresponding to a transmitted bit stream. In an exemplary bit stream generation implementation, the target input signal X comprises a desired transmit signal and the produced digital stream Y comprises an estimate of the desired transmit signal.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: April 25, 2017
    Assignee: Intel Corporation
    Inventors: Kameran Azadet, Steven C. Pinault
  • Patent number: 9607604
    Abstract: An active noise control apparatus for a vehicle including: a plurality of microphones each configured to receive noise generated in the vehicle and generate an electrical signal corresponding to the noise; an external amplifier configured to supply power required for operations of the plurality of microphones; and a head unit configured to control the external amplifier to output a signal for removing the noise, based on the electrical signals generated from the plurality of microphones.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: March 28, 2017
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Yun Sung Kim
  • Patent number: 9595251
    Abstract: Various exemplary embodiments relate to a device for noise cancelling using a method of updating a noise cancelling distribution area. The device may include: a memory; a processor configured to: measure a location of a user's head; measure an acoustic environment surrounding the user; determine active noise reduction controller configuration parameters for a noise cancelling distribution area; generate at least one active noise reduction control from the active noise reduction controller configuration parameters; and apply the at least one active noise reduction control creating the noise cancelling distribution area in a region around the user's head or ear.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: March 14, 2017
    Assignee: HONDA MOTOR CO., LTD.
    Inventor: Joseph Whinnery
  • Patent number: 9484010
    Abstract: An active vibration noise control device obtains error signals corresponding to a cancellation error between vibration noise and control sounds generated by multiple speakers, from microphone(s), and actively controls the vibration noise. A basic signal generating unit generates a basic signal based on a vibration noise frequency. An adaptive notch filter unit generates control signals provided to each of the multiple speakers by applying a filter coefficient to the basic signal. A reference signal generating unit generates a reference signal from the basic signal based on multiple transfer characteristics from the multiple speakers to the one or more microphones. A filter coefficient updating unit updates the filter coefficient used by the adaptive notch filter unit so as to minimize the error signals. A controlling unit changes amplitude of the control signals of the speakers based on a similarity between the transfer characteristics and characteristics of the vibration noise.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: November 1, 2016
    Assignee: PIONEER CORPORATION
    Inventors: Manabu Nohara, Yoshiki Ohta, Kensaku Obata, Yusuke Soga
  • Patent number: 9326087
    Abstract: A vehicle system is provided that includes a sound augmentation system with a sound augmentation generator that produces an augmented audio output to drive at least one audio output based on a transfer function and a plurality of audio tuning parameters. The vehicle system also includes a sound augmentation system health monitor that compares a feedback of the augmented audio output to a level of at least one input relative to at least one environmental condition to determine a current performance level of the sound augmentation system. The sound augmentation system health monitor also determines a difference between the current performance level of the sound augmentation system and at least one performance threshold level, and initiates an alert upon determining that the difference is at a predetermined level.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: April 26, 2016
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Frank C. Valeri, Scott M. Reilly
  • Patent number: 9288575
    Abstract: A vehicle system is provided that includes a sound augmentation system with a sound augmentation generator that produces an augmented audio output to drive at least one audio output based on a transfer function. The vehicle system also includes a sound augmentation system health monitor that determines a current performance level of the sound augmentation system based on at least one audio input and a feedback of the augmented audio output, and triggers a transfer function update prompt based on a difference between the current performance level and an expected performance level being at a threshold level. A user interface outputs the transfer function update prompt and receives a transfer function calibration request in response to the transfer function update prompt. A transfer function calibration module drives a calibration sequence on at least one audio output and monitors at least one audio input to determine an updated transfer function.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: March 15, 2016
    Assignees: GM GLOBAL TECHNOLOGY OPERATIONS LLC, BOSE CORPORATION
    Inventors: Frank C. Valeri, Scott M. Reilly, James May
  • Patent number: 9226066
    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: Grant
    Filed: April 9, 2010
    Date of Patent: December 29, 2015
    Assignee: PIONEER CORPORATION
    Inventors: Yoshiki Ohta, Manabu Nohara, Yusuke Soga, Shin Hasegawa, Hisashi Kihara
  • Patent number: 9215540
    Abstract: A buzz detecting method and a buzz detecting system are provided for testing whether an under-test sound playing device generates a buzz while playing sound. By an application program module, plural under-test sound signals from the under-test sound playing device are converted into plural under-test frequency-domain signals corresponding to the under-test sound signals through Fourier transform. Moreover, the application program module calculates plural under-test noise ratios corresponding to the frequencies of respective under-test sound signals according to respective under-test frequency-domain signals. After the plural under-test noise ratios are compared with plural standard noise ratios from a standard sound playing device, the application program module may automatically judge whether the under-test sound playing device generates a buzz while playing sound. Since the testing procedure does not need to be implemented by the trained testers, the overall efficiency is largely enhanced.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: December 15, 2015
    Assignee: PRIMAX ELECTRONICS LTD.
    Inventors: Jung-Lang Tsai, Yuan Min Wang
  • Patent number: 9201628
    Abstract: Maximum likelihood bit-stream generation and detection techniques are provided using the M-algorithm and Infinite Impulse Response (IIR) filtering. The M-Algorithm is applied to a target input signal X to perform Maximum Likelihood Sequence Estimation on the target input signal X to produce a digital bit stream B, such that after filtering by an IIR filter, the produced digital stream Y produces an error signal satisfying one or more predefined requirements. The predefined requirements comprise, for example, a substantially minimum error. In an exemplary bit detection implementation, the target input signal X comprises an observed analog signal and the produced digital stream Y comprises a digitized output of a receive channel corresponding to a transmitted bit stream. In an exemplary bit stream generation implementation, the target input signal X comprises a desired transmit signal and the produced digital stream Y comprises an estimate of the desired transmit signal.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: December 1, 2015
    Assignee: Intel Corporation
    Inventors: Kameran Azadet, Steven C. Pinault
  • Patent number: 9172346
    Abstract: A method for configuring an electronic device having an equalizer suited for processing a numeric audio signal according to an objective equalization improves the equalization of the numeric audio signal. The equalizer has a transfer function that implements a set of band-pass filters having a constant band-pass and a configurable weight in the transfer function. The method provides a set of objective gains representing the objective equalization, with each objective gain corresponding to a respective frequency. The method also determines values of the weights of the band-pass filters that minimize an error evaluated by comparing the set of objective gains to the transfer function. The set of band-pass filters includes at least one pair of band-pass filters having a common central frequency and distinct band-passes. The method also sets the weights of the band-pass filters to the determined values.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: October 27, 2015
    Assignee: ST-Ericsson SA
    Inventor: Stéphan Tassart
  • Patent number: 9123325
    Abstract: An active vibration noise control device cancels vibration noise by making plural speakers generate control sounds. The active vibration noise control device selects one or more speakers which output the control sounds, from plural speakers, based on a relationship between (1) a first phase difference which corresponds to a difference between phase characteristics of the vibration noise from a vibration noise source to an evaluation point and phase characteristics of the vibration noise from the vibration noise source to a pseudo evaluation point and (2) a second phase difference for each of the plural speakers corresponding to a difference between phase characteristics of the control sound from the speaker to the evaluation point and phase characteristics of the control sound from the speaker to the pseudo evaluation point. Therefore, it stably decreases the vibration noise at the pseudo evaluation point independently of a frequency band of the vibration noise.
    Type: Grant
    Filed: February 15, 2010
    Date of Patent: September 1, 2015
    Assignee: PIONEER CORPORATION
    Inventors: Akihiro Iseki, Yoshiki Ohta, Yoshitomo Imanishi, Kensaku Obata