Using A Particular Adaptive Filter Patents (Class 370/290)
  • Patent number: 10790874
    Abstract: Acoustic echo cancelling includes receiving a source signal and a sink signal; providing a first error signal representative of an echo-free residual signal based on a first set of coefficients based on the source signal and the sink signal, the first error signal forming an output signal of the controller; providing a second error signal based on a second set of coefficients based on the source signal and the sink signal; detecting a room change if the evaluated first second error signal is greater than a sum or product of the evaluated second first error signal and a first threshold; copying one of sets of reference coefficients stored in a memory to the second acoustic echo canceller; and copying the first set of coefficients from the first acoustic echo canceller as a set of reference coefficients into at least one of the second acoustic echo canceller and the memory.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: September 29, 2020
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Vasudev Kandade Rajan
  • Patent number: 10789967
    Abstract: A noise detection method and a noise detection system are provided. The noise detection method includes: obtaining an audio signal; comparing the audio signal with a wave of a noise model to obtain a correlation value; and identifying whether the audio signal is a candidate noise signal based on the correlation value. The method can detect plugging noises effectively.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: September 29, 2020
    Assignee: Harman International Industries, Incorporated
    Inventors: Dong Yang, Zhengliang Xue, Lan Mao
  • Patent number: 10706871
    Abstract: Methods, systems, and media for voice communication are provided. In some embodiments, a system for voice communication is provided, the system including: a first audio sensor that captures an acoustic input; and generates a first audio signal based on the acoustic input, wherein the first audio sensor is positioned between a first surface and a second surface of a textile structure. In some embodiments, the first audio sensor is positioned in a region located between the first surface and the second surface of the textile structure. In some embodiments, the first audio sensor is positioned in a passage located between the first surface and the second surface of the textile structure.
    Type: Grant
    Filed: September 29, 2019
    Date of Patent: July 7, 2020
    Inventor: Xinxiao Zeng
  • Patent number: 10652654
    Abstract: Dynamic device speaker tuning for echo control includes detecting audio rendering from a speaker on a device; based at least on detecting the audio rendering, capturing, with a microphone on the device, an echo of the rendered audio; performing a Fourier Transform on the echo and the rendered audio; determining a real-time transfer function for at least one signature band; determining a difference between the real-time transfer function and a reference transfer function; and tuning the speaker for audio rendering, based at least on the difference between the real-time transfer function and the reference transfer function, by adjusting an audio amplifier equalization. For some examples, the signature band represents a wall echo or an alternative mounting option. For some examples, the echo is collected during intervals while the audio rendering is ongoing.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: May 12, 2020
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Christopher Michael Forrester, Omar Joya, Bradley Robert Ekin
  • Patent number: 10630340
    Abstract: Embodiments described herein provide echo cancellation power saving management at a cable transceiver. An echo response signal having a first number of signal components is obtained, via an echo cancellation filter. At a first iteration for calculating a first accumulative echo power, a respective echo tap that corresponds to the first iteration is identified. The first accumulative echo power is calculated for the respective iteration by summing powers of outputs from a last echo tap to the respective echo tap. It is then determined whether the first accumulative echo power, exceeds a pre-determined echo power threshold. If the first accumulative echo power exceeds the pre-determined echo power threshold, a first turn-off indication is sent to the echo cancellation filter to turn off all echo taps including and between the last echo tap to the first echo tap.
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: April 21, 2020
    Assignee: Marvell International Ltd.
    Inventors: Shaoan Dai, Kok-Wui Cheong, Zhenzhong Gu
  • Patent number: 10601998
    Abstract: Audio systems and methods are provided to reduce echo content in an audio signal. The systems and methods receive an audio signal and sound stage rendering parameter(s), and select a set of filter coefficients to filter the audio signal to provide an estimated echo signal. The estimated echo signal is subtracted from a microphone signal to provide an output signal with reduced echo content. The set of filter coefficients are selected based upon the sound stage rendering parameter(s) from among a plurality of stored sets of filter coefficients.
    Type: Grant
    Filed: January 8, 2019
    Date of Patent: March 24, 2020
    Assignee: Bose Corporation
    Inventors: Cristian Marius Hera, Vigneish Kathavarayan, Jeffery R. Vautin, Elie Bou Daher, Paraskevas Argyropoulos
  • Patent number: 10522167
    Abstract: A system configured to improve beamforming by using deep neural networks (DNNs). The system can use one trained DNN to focus on a first person speaking an utterance (e.g., target user) and one or more trained DNNs to focus on noise source(s) (e.g., wireless loudspeaker(s), a second person speaking, other localized sources of noise, or the like). The DNNs may generate time-frequency mask data that indicates individual frequency bands that correspond to the particular source detected by the DNN. Using this mask data, a beamformer can generate beamformed audio data that is specific to a source of noise. The system may perform noise cancellation to isolate first beamformed audio data associated with the target user by removing second beamformed audio data associated with noise source(s).
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: December 31, 2019
    Assignee: AMAZON TECHONLOGIES, INC.
    Inventors: Robert Ayrapetian, Philip Ryan Hilmes, Trausti Thor Kristjansson
  • Patent number: 10506252
    Abstract: In digital video image encoding and decoding, a filter type is selected based on symmetrical properties of the images and coefficient values of an interpolation filter are calculated based on the selected filter type. Coefficient values, filter tap-length and selected filter-type are provided in the encoded video data. Coefficient values are also calculated based on a prediction signal representative of the difference between a video frame and a reference image. The prediction signal is calculated from the reference image based on a predefined base filter and motion estimation performed on the video frame. The predefined base filter has fixed coefficient values. Coefficient values are selected from interpolation of pixel values in a selected image segment in the video frame. Symmetry properties of images can be a vertical symmetry, a horizontal symmetry and a combination thereof, so that only a portion of the filter coefficients are coded.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: December 10, 2019
    Assignee: Conversant Wireless Licensing S.a r.l.
    Inventors: Dmytro Rusanovskyy, Kemal Ugur
  • Patent number: 10498389
    Abstract: Disclosed is an echo canceller (10) including: a false echo calculator (32) that acquires current and previous filter-coefficient groups used by an adaptive filtering unit (20), and that calculates plural false echo signals by performing a filtering operation using each of the current and previous filter-coefficient groups on a sequence of reception signals (x(n)); a voice-transmission signal buffer that outputs a previous voice-transmission signal (y(n?1)); an evaluation value calculator (34) that calculates plural evaluated values of an echo cancellation quantity by using the previous voice-transmission signal; a filter selector (36) that selects a new filter-coefficient group on the basis of the plural evaluated values of the echo cancellation quantity; a foreground filter (39) that performs a filtering operation using the new filter-coefficient group on the sequence of reception signals (x(n)) to generate an estimated echo component; and a subtractor (25) that subtracts the estimated echo component from a
    Type: Grant
    Filed: November 16, 2015
    Date of Patent: December 3, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tomoharu Awano, Satoru Furuta, Jun Ishii
  • Patent number: 10488485
    Abstract: A magnetic resonance imaging (MRI) apparatus for obtaining a magnetic resonance (MR) image using a multi-echo pulse sequence including a plurality of repetition times, including a memory configured to store an MR signal obtained using the multi-echo pulse sequence, and an image processor configured to determine a plurality of echo times included in the plurality of repetition times to provide the multi-echo pulse sequence including the plurality of echo times during the plurality of repetition times, and to obtain the MR image, based on the MR signal, wherein the plurality of repetition times includes a first repetition time adjacent to a second repetition time, wherein the plurality of echo times includes a first echo time of the first repetition time, a second echo time of the first repetition time, a first echo time of the second repetition time, and a second echo time of the second repetition time.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: November 26, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Joon-sung Choi, Young-beom Kim
  • Patent number: 10419062
    Abstract: A method and apparatus for achieving simultaneous transmit and receive operation with a digital phased array is described. Digital beamforming and cancellation enables adjacent transmitting and receiving sub-arrays to operate simultaneously in the same frequency band.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: September 17, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Jonathan P. Doane, Kenneth E. Kolodziej, Bradley T. Perry
  • Patent number: 10410653
    Abstract: In an audio processing system (300), a filtering section (350, 400): receives subband signals (410, 420, 430) corresponding to audio content of a reference signal (301) in respective frequency subbands; receives subband signals (411, 421, 431) corresponding to audio content of a response signal (304) in the respective subbands; and forms filtered inband references (412, 422, 432) by applying respective filters (413, 423, 433) to the subband signals of the reference signal.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: September 10, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Dong Shi, Glenn N. Dickins, David Gunawan, Xuejing Sun
  • Patent number: 10396894
    Abstract: A transmission system for transmitting data as part of a communications system, the data comprising a plurality of data symbols or elements, the transmission system being configured to divide the data into at least a first data portion and a second data portion, wherein the first data portion is communicated by transmitting signals in selected carrier channels, wherein the transmission system is configured to encode at least one data symbol or element by selecting a relative order of at least one first carrier channel having a first operational state and at least one second carrier channel having a second operational state.
    Type: Grant
    Filed: April 14, 2017
    Date of Patent: August 27, 2019
    Assignee: The University Court of the University of Edinburgh
    Inventors: Harald Haas, Sinan Sinanovic, Dobroslav Tsonev
  • Patent number: 10230352
    Abstract: Embodiments of the invention may be used to implement a rate converter that includes: 6 channels in forward (audio) path, each channel having a 24-bit signal path per channel, an End-to-end SNR of 110 dB, all within the 20 Hz to 20 KHz bandwidth. Embodiment may also be used to implement a rate converter having: 2 channels in a reverse path, such as for voice signals, 16-bit signal path per channel, an End-to-end SNR of 93 dB, all within 20 Hz to 20 KHz bandwidth. The rate converter may include sample rates such as 8, 11.025, 12, 16, 22.05, 24, 32 44.1, 48, and 96 KHz. Further, rate converters according to embodiments may include a gated clock in low-power mode to conserve power.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: March 12, 2019
    Assignee: AVNERA CORPORATION
    Inventor: Xudong Zhao
  • Patent number: 10192567
    Abstract: A portable device performs echo cancellation and echo suppression. An audio echo signal and an audio desired signal are obtained from an acoustic echo correction stage of the portable device. The echo and desired signals are converted to the frequency domain. Frequency bin results of the respective frequency domain converted echo and desired signals are grouped into echo and desired sub-bands. A sub-band suppressor gain is estimated based on the estimated sub-band energy for the echo and desired sub-bands. The frequency domain converted echo signal is modulated based at least in part on the estimated sub-band suppressor gain to compensate for residual echo. The compensated frequency domain converted echo signal is time domain converted into an audio output signal. The audio output signal is processed by a selected one of a voice recognition engine and a communication module transmitter.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: January 29, 2019
    Assignee: Motorola Mobility LLC
    Inventors: Pratik M. Kamdar, Jincheng Wu, Joel A. Clark, Malay Gupta, Plamen A. Ivanov
  • Patent number: 10135969
    Abstract: A controller for an echo suppressor configured to suppress a residual echo of a far-end signal included in a primary error signal, the controller adapted for operation with a primary adaptive filter configured to form a primary echo estimate of the far-end signal included in a microphone signal and an echo canceller configured to cancel that primary echo estimate from the microphone signal so as to form the primary error signal, the controller comprising: a secondary adaptive filter configured to form a secondary echo estimate of the far-end signal comprised in the microphone signal; and control logic operable in at least two modes selected in dependence on a convergence state of the primary adaptive filter, the control logic being configured to control activation of the echo suppressor in dependence one or more transient or steady state decision parameters.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: November 20, 2018
    Assignee: Imagination Technologies Limited
    Inventors: Senthil Kumar Mani, Gandhi Namani
  • Patent number: 10110998
    Abstract: In accordance with embodiments of the present disclosure, a system may include an audio input for receiving an audio input signal for reproduction at a speaker, a sensor input for receiving at least one sensor signal indicative of a physical quantity indicative of a variable acoustic volume to which an acoustic output of a speaker generates sound, wherein the acoustic volume is partially enclosed by structural members of an information handling system comprising the speaker, an output for generating an audio output signal to the speaker, and a processor configured to apply an adaptive audio response to the audio input signal to generate the audio output signal, wherein the adaptive audio response is a function of the physical quantity.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: October 23, 2018
    Assignee: Dell Products L.P.
    Inventors: Douglas J. Peeler, Adie O. Tan, Timothy M. Radloff
  • Patent number: 10090000
    Abstract: Technical solutions are described for acoustic echo cancellation. An example method includes computing, by a beamformer, a plurality of updated beamformer filter coefficients, the beamformer filter coefficients computed adaptively to determine a speech signal from a plurality of input audio signals. Further, the method includes computing, by a transfer function estimator, a relative transfer function based on the updated beamformer filter coefficients and a plurality of present acoustic echo canceller coefficients. Further, the method includes adjusting a plurality of acoustic echo canceller coefficients using the relative transfer function, and generating an output speech signal, by the acoustic echo canceller, by cancelling echo components from the speech signal using the adjusted filter coefficients. Further, the method includes sending, by the acoustic echo canceller, the output speech signal to a far end speech device.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: October 2, 2018
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Eli Tzirkel-Hancock, Ilan Malka, Vladimir Tourbabin
  • Patent number: 10074380
    Abstract: Method for performing speech enhancement using a Deep Neural Network (DNN)-based signal starts with training DNN offline by exciting a microphone using target training signal that includes signal approximation of clean speech. Loudspeaker is driven with a reference signal and outputs loudspeaker signal. Microphone then generates microphone signal based on at least one of: near-end speaker signal, ambient noise signal, or loudspeaker signal. Acoustic-echo-canceller (AEC) generates AEC echo-cancelled signal based on reference signal and microphone signal. Loudspeaker signal estimator generates estimated loudspeaker signal based on microphone signal and AEC echo-cancelled signal. DNN receives microphone signal, reference signal, AEC echo-cancelled signal, and estimated loudspeaker signal and generates a speech reference signal that includes signal statistics for residual echo or for noise.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: September 11, 2018
    Assignee: Apple Inc.
    Inventors: Jason Wung, Ramin Pishehvar, Daniele Giacobello, Joshua D. Atkins
  • Patent number: 10068585
    Abstract: An echo canceller device is provided with a first filter unit that generates a first output signal y1(k) by filtering a first input signal x1(k) with a filter coefficient h(k), an adaptation unit that modifies the filter coefficient h(k) on the basis of an adaptation algorithm so that a first error signal e1(k) becomes small, a first delaying unit that delays a first objective signal d1(k) by a certain time period ? and outputs the signal as a second objective signal d2(k), a second delaying unit that delays the first input signal x1(k) by the certain time period ? and outputs the signal as a second input signal x2(k), and a second filter unit that generates a second output signal y2(k) by filtering the second input signal x2(k) by the filter coefficient h(k) modified by the adaptation unit.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: September 4, 2018
    Assignee: AMENITY RESEARCH INSTITUTE CO., LTD.
    Inventors: Eiji Misawa, Toshio Yagi, Yasumasa Shibata, Hiroyuki Toyozumi, Kiyotsugu Arai, Katsuaki Satoh
  • Patent number: 10063364
    Abstract: A full-duplex transceiver is provided with componentry and methods for cancellation of nonlinear self-interference signals. The transceiver is capable of receiving an incoming radio-frequency signal that includes both a desired radio-frequency signal component and a self-interference component caused by the transceiver's own radio-frequency transmission. The transceiver demodulates the incoming radio-frequency signal to generate a first demodulated signal. The transceiver combines an analog corrective signal with the first demodulated signal to generate a second demodulated signal with reduced self-interference. The transceiver processes the first and second demodulated signals to determine a desired incoming baseband signal and to determine nonlinear components of the self-interference signal, such as nonlinearities introduced by the transceiver's power amplifier.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: August 28, 2018
    Inventor: Amir Keyvan Khandani
  • Patent number: 10045347
    Abstract: Embodiments of the present invention provide a virtual multicarrier design for orthogonal frequency division multiple access communications. Other embodiments may be described and claimed.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: August 7, 2018
    Assignee: INTEL CORPORATION
    Inventors: Hujun Yin, Rongzhen Yang, Xiaoshu Qian, Yang-Seok Choi, Sassan Ahmadi, Kamran Etemad
  • Patent number: 9998235
    Abstract: This disclosure provides systems, methods, and apparatus for mitigating the effects of interference signals on optical signals received at a direct-detection optical receivers. The optical receivers are capable of attenuating interference noise signals resulting from the interference between a transmitted optical signal transmitted from a transmitter to the optical receiver and one or more additional signals received at the optical receiver. The interference can be due to multi-path interference or due to in-band interference. The receivers include a tunable filter for filtering the received optical signal to remove the interference. A frequency offset module processes the received optical signal to determine a frequency offset indicative of the difference between the carrier frequencies of a modulated optical signal and an interference optical signal.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: June 12, 2018
    Assignee: Google LLC
    Inventors: Xiang Zhou, Ryohei Urata, Erji Mao, Hong Liu, Christopher Lyle Johnson
  • Patent number: 9967661
    Abstract: An echo cancellation system performs audio beamforming to separate audio input into multiple directions (e.g., target signals) and generates multiple audio outputs using two acoustic echo cancellation (AEC) circuits. A first AEC removes a playback reference signal (generated from a signal sent a loudspeaker) to isolate speech included in the target signals. A second AEC removes an adaptive reference signal (generated from microphone inputs corresponding to audio received from the loudspeaker) to isolate speech included in the target signals. A beam selector receives the multiple audio outputs and selects the first AEC or the second AEC based on a linearity of the system. When linear (e.g., no distortion or variable delay between microphone input and playback signal), the beam selector selects an output from the first AEC based on signal to noise (SNR) ratios. When nonlinear, the beam selector selects an output from the second AEC.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: May 8, 2018
    Assignee: Amazon Technologies, Inc.
    Inventors: Philip Ryan Hilmes, Robert Ayrapetian
  • Patent number: 9888330
    Abstract: One or more delay estimators are used to detect failure in a signal processing component, such as an acoustic echo canceller. A first delay estimator is used to generate i) an estimated post-processing delay between when a known audio signal was conveyed to a loudspeaker, and when a portion of the processed audio signal that includes the known audio signal was output from the signal processing component, and ii) a confidence level for the estimated post-processing delay. A failure of the signal processing component may be detected in response to the estimated post-processing delay exceeding a threshold. A second delay estimator may also be used to generate an estimated pre-processing delay and a confidence level for the estimated pre-processing delay for comparison to the estimated post-processing delay and confidence level for the estimated post-processing delay in order to provide further failure detection accuracy and specificity.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: February 6, 2018
    Assignee: GetGo, Inc.
    Inventors: Patrick Vicinus, Björn Völcker
  • Patent number: 9830900
    Abstract: A variable update step size is determined in proportion to a magnitude ratio or magnitude difference between a first residual signal and a second residual signal. The first residual signal is obtained by using adaptive filter coefficient sequence, where the adaptive filter coefficient sequence has been obtained in previous operations of the adaptive equalizer. The second residual signal is obtained by using a prior update adaptive filter coefficient sequence, where the prior update adaptive filter coefficient sequence is obtained by performing a coefficient update with an arbitrary prior update step size on the adaptive filter coefficient sequence having been obtained in previous operations of the adaptive equalizer.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: November 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsuyoshi Yano, Tomoharu Awano
  • Patent number: 9793879
    Abstract: Embodiments of the invention may be used to implement a rate converter that includes: 6 channels in forward (audio) path, each channel having a 24-bit signal path per channel, an End-to-end SNR of 110 dB, all within the 20 Hz to 20 KHz bandwidth. Embodiment may also be used to implement a rate converter having: 2 channels in a reverse path, such as for voice signals, 16-bit signal path per channel, an End-to-end SNR of 93 dB, all within 20 Hz to 20 KHz bandwidth. The rate converter may include sample rates such as 8, 11.025, 12, 16, 22.05, 24, 32 44.1, 48, and 96 KHz. Further, rate converters according to embodiments may include a gated clock in low-power mode to conserve power.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: October 17, 2017
    Assignee: AVNERA CORPORATION
    Inventor: Xudong Zhao
  • Patent number: 9769490
    Abstract: In digital video image encoding and decoding, a filter type is selected based on symmetrical properties of the images and coefficient values of an interpolation filter are calculated based on the selected filter type. Coefficient values, filter tap-length and selected filter-type are provided in the encoded video data. Coefficient values are also calculated based on a prediction signal representative of the difference between a video frame and a reference image. The prediction signal is calculated from the reference image based on a predefined base filter and motion estimation performed on the video frame. The predefined base filter has fixed coefficient values. Coefficient values are selected from interpolation of pixel values in a selected image segment in the video frame. Symmetry properties of images can be a vertical symmetry, a horizontal symmetry and a combination thereof, so that only a portion of the filter coefficients are coded.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: September 19, 2017
    Assignee: Core Wireless Licensing S.a.r.l.
    Inventors: Dmytro Rusanovskyy, Kemal Ugur
  • Patent number: 9667293
    Abstract: A low noise receiver includes a downconverter configured to receive a radio frequency (RF) signal, the downconverter comprising a switching architecture configured to generate a plurality of output phases based on a respective plurality of local oscillator (LO) signals, a differencing circuit configured to combine the plurality of output phases such that an nth output phase is differenced with an (n+K)th output phase, resulting in gain-added output phases, and a summation filter configured to receive the gain-added output phases and configured to combine the gain-added output phases such that a response of the receiver effectively reduces odd harmonics of the RF signal.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: May 30, 2017
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Rajasekhar Pullela, William J. Domino
  • Patent number: 9659555
    Abstract: An echo cancellation system performs audio beamforming to separate audio input into multiple directions (e.g., target signals) and generates multiple audio outputs using two acoustic echo cancellation (AEC) circuits. A first AEC removes a playback reference signal (generated from a signal sent a loudspeaker) to isolate speech included in the target signals. A second AEC removes an adaptive reference signal (generated from microphone inputs corresponding to audio received from the loudspeaker) to isolate speech included in the target signals. A beam selector receives the multiple audio outputs and selects the first AEC or the second AEC based on a linearity of the system. When linear (e.g., no distortion or variable delay between microphone input and playback signal), the beam selector selects an output from the first AEC based on signal to noise (SNR) ratios. When nonlinear, the beam selector selects an output from the second AEC.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: May 23, 2017
    Assignee: AMAZON TECHNOLOGIES, INC.
    Inventors: Philip Ryan Hilmes, Robert Ayrapetian
  • Patent number: 9653060
    Abstract: An echo cancellation system that uses a combined reference signal using a playback reference signal and an adaptive reference signal. The playback reference signal is generated from a playback signal sent to a loudspeaker and the adaptive reference signal is generated using beamforming on microphone inputs corresponding to audio received from the loudspeaker. The system applies a low pass filter to the playback reference signal and applies a high pass filter to the adaptive reference signal to generate the combined reference signal. The system may remove the combined reference signal from target signals associated with the microphone inputs to isolate speech included in the target signals.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: May 16, 2017
    Assignee: AMAZON TECHNOLOGIES, INC.
    Inventors: Philip Ryan Hilmes, Robert Ayrapetian
  • Patent number: 9655017
    Abstract: A node for a communication system that is configured to communicate with a mobile node via a first connection and to communicate with a third node via a first forwarding path is disclosed. After a procedure for handover of the first connection to a second connection between the mobile node and a target network node is initiated, data is communicated from the node to the third node for transmission to the target network node via a second forwarding path. The third node is configured to receive the data and to forward it to the target network node.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: May 16, 2017
    Assignee: Nokia Technologies Oy
    Inventor: Sandro Grech
  • Patent number: 9548879
    Abstract: Embodiments of the present invention provide a virtual multicarrier design for orthogonal frequency division multiple access communications. Other embodiments may be described and claimed.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: January 17, 2017
    Assignee: Intel Corporation
    Inventors: Hujun Yin, Rongzhen Yang, Xiaoshu Qian, Yang-Seok Choi, Sassan Ahmadi, Kamran Etemad
  • Patent number: 9521264
    Abstract: Echo removal techniques are described. As part of the echo removal, an adaptive model estimate of the echo in a received audio signal is determined using an adaptive model based on an outputted audio signal and the received audio signal. The adaptive model executes an algorithm comprising a convergence parameter to determine filter coefficients and uses said filter coefficients to filter the outputted audio signal to determine the adaptive model estimate of the echo. An accuracy value of the adaptive model is determined according to an echo return loss enhancement metric. The convergence parameter is updated based on the accuracy value. The adaptive model estimate of the echo is used to remove the echo in the received audio signal.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: December 13, 2016
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Per Ahgren
  • Patent number: 9484983
    Abstract: An impedance adjustment method for a communication device, wherein the communication device has a plurality of impedance paths for selection, includes: selecting an initial impedance path; and utilizing a predetermined algorithm to examine a portion of the plurality of impedance paths by starting from the initial impedance path for selecting an optimized impedance path for the communication device. A delay capacitance adjustment method for a communication device, wherein the communication device has a plurality of delay capacitance paths for selection, includes: selecting an initial delay capacitance path; and utilizing a predetermined algorithm to examine a portion of the plurality of delay capacitance paths by starting from the initial delay capacitance path for selecting an optimized delay capacitance path of the communication device.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: November 1, 2016
    Assignee: Realtek Semiconductor Corp.
    Inventors: Ching-Yao Su, Liang-Wei Huang, Shih-Wei Wang, Hsuan-Ting Ho
  • Patent number: 9479368
    Abstract: A pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end is adjusted. A signal received quality report which is obtained according to the pre-distortion coefficient before adjustment is analyzed and fed back by a receiving end and a signal received quality report that is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end. The analysis determines a variation situation of signal received quality of the receiving end. If the signal received quality of the receiving end becomes better, the pre-distortion coefficient after adjustment is used as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end. The process then returns to the step of adjusting a pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: October 25, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xinyue Ma, Wei Xue, Tianxiang Wang, Xiangdong Deng
  • Patent number: 9473865
    Abstract: A system for detecting motion comprising a first speaker, a first microphone separated from the first speaker by a distance D1, a sound generator, an echo parameter measurement device and an echo parameter monitor, wherein the echo parameter monitor stores two or more sequential echo parameters and generates a motion indicator if the two or more sequential echo parameters indicate a change in an acoustic echo path that exceeds a predetermined threshold.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: October 18, 2016
    Assignee: CONEXANT SYSTEMS, INC.
    Inventors: Trausti Thormundsson, Ragnar H. Jonsson, Youhong Lu, Govind Kannan, Sverrir Olafsson
  • Patent number: 9385779
    Abstract: A processing system can include a tracking microphone array; audio tracker circuitry connected to the tracking microphone array to track an audio source based on an audio input from the array; communication microphones; and a processor. The processor can include audio circuitry to receive an audio input from the communication microphones and process the audio input to apply one or more of acoustic echo cancellation (AEC) and acoustic echo suppression (AES) processing to the audio input. The processor can further include calculating circuitry to calculate a ratio of signal power after and before the AEC and/or the AES processing, and control circuitry to generate an acoustic echo presence indication based on the ratio calculated by the calculating circuitry. The processor can transmit, via transmitting circuitry, the acoustic echo presence indication to an audio tracking device via a data communication channel between the processor and the audio tracker.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: July 5, 2016
    Assignee: Cisco Technology, Inc.
    Inventor: Haohai Sun
  • Patent number: 9360503
    Abstract: A method for determining a sampling time of a signal, the method including: determining a candidate sampling time of a signal for input to a sampling circuit; determining a resultant sampling time at which the sampling circuit samples the signal when input with the candidate sampling time; and determining a sampling time of the signal based on a noise shaping of a difference between the resultant sampling time and the candidate sampling time.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: June 7, 2016
    Assignee: INTEL DEUTSCHLAND GMBH
    Inventors: Lajos Gazsi, Stefan Meier, Matthias Schoebinger
  • Patent number: 9313735
    Abstract: The present invention relates to a method and an apparatus for efficiently controlling an uplink control signal of user equipment in an environment where a macro cell and a repeater exist together, and the method for controlling uplink transmission power of the user equipment in the wireless communication system, according to the present invention, comprises: an obtaining step for receiving a reference signal from a base station and obtaining a channel state information value; a determining step for determining whether a scaling condition is satisfied by using the channel state information value that is obtained; a calculating step for calculating a transmission power on the basis of scheduling information when the scaling condition is satisfied; and a transmitting step for transmitting data by using the transmission power that is calculated.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 12, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sang Bum Kim, Soeng Hun Kim, Kyeong In Jeong
  • Patent number: 9270418
    Abstract: In some aspects, techniques for wireless signal decoding are described. In some instances, a number of superposition codes are computed based on a set of orthogonal binary codes. The set of orthogonal binary codes includes multiple subsets; each superposition code corresponds to one of the subsets and includes a combination of the binary codes in the corresponding subset. One of the subsets is selected based on a correlation between a wireless signal and the superposition code that corresponds to the subset. One of the binary codes is then selected from the selected subset based on a correlation between the wireless signal and the binary code. The wireless signal is decoded based on the selected binary code.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: February 23, 2016
    Assignee: Cognitive Systems Corp.
    Inventors: Stephen A. Devison, Mohammad Omer
  • Patent number: 9210270
    Abstract: A method includes accessing signal data descriptive of a transmission sequence and pre-determined values associated with the transmission sequence. The signal data and the pre-determined values may be stored in a memory. The method includes transmitting a signal from a speaker of an electronic device according to the transmission sequence. The method includes generating a frame based on one or more signals received at a microphone of the electronic device. The one or more signals include an echo signal associated with the transmitted signal. The method includes processing the frame using the pre-determined values to produce an output frame in which a contribution associated with the echo signal is reduced.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 8, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Michael Leviant, Noam Dagan, Hui-ya Liao Nelson
  • Patent number: 9185233
    Abstract: Methods, apparatuses, systems, and software are disclosed for providing a phone or other audio communication device with a fixed-path acoustic echo cancellation feature that compensates for a fixed-path acoustic coupling caused by transmission of sound from one or more speakers to one or more microphones through, for instance, the phone body itself.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: November 10, 2015
    Assignee: Intel Deutschland GmbH
    Inventor: Gurhan Saplakoglu
  • Patent number: 9001712
    Abstract: Apparatus and methods disclosed herein implement an RF receive-band filter at a receive chain input of a wireless base station with a co-located transmitter and receiver. The RF receive-band filter includes an adaptive filter component to perform filtering operations on samples of a digital baseband or intermediate frequency signal x(n) from a transmit chain associated with the wireless base station. An adaptive filter transfer function is determined in real time such that samples of the baseband transmit signal x(n) are transformed into a cancellation baseband signal z(n). The digital cancelation baseband signal z(n) is then digital-to-analog converted and the resulting analog baseband signal z(t) is up-converted to obtain a subtractive RF cancelation signal c(t). C(t) is summed with a desirable received signal RF component r(t) and an undesirable transmitter leakage RF signal component l(t) appearing at the input to the base station receiver.
    Type: Grant
    Filed: April 27, 2013
    Date of Patent: April 7, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Nagarajan Viswanathan, Visvesvaraya Pentakota, Robert Clair Keller, Thomas Neu, Francesco Dantoni
  • Publication number: 20150078226
    Abstract: A filter enhancer provides greater performance in a passive filter. The passive filter has an input terminal for receiving a signal in a first frequency band and an output terminal for providing a signal in a second frequency band. The filter enhancer includes: (a) a first canceller circuit coupled between input terminal and output terminal, the first canceller circuit including a first finite impulse response (FIR) filter for attenuating signals in the first frequency band; and (b) a control circuit coupled to output terminal and first canceller circuit for providing adaptive coefficients for configuring the first FIR filter. The first FIR filter may be implemented by either a digital FIR filter or an analog FIR filter. The filter enhancer may further include a second canceller circuit coupled between input terminal and output terminal, the second canceller circuit including a second FIR filter for attenuating signals in the second frequency band.
    Type: Application
    Filed: September 16, 2013
    Publication date: March 19, 2015
    Inventors: Olivier Charlon, Qian Yu
  • Patent number: 8923145
    Abstract: A method and system for validating SIPSI of a broadcast table in an electronic device is provided. The method includes receiving a first cache signature and retrieving a second cache signature from a memory. The method also includes identifying differences between the first cache signature and the second cache signature. Further, the method includes performing one of updating the broadcast table and updating a portion of the broadcast table. The system includes an electronic device for validating SIPSI of a broadcast table. The electronic device includes a broadcast receiver for receiving a first cache signature and a memory for storing a second cache signature. The electronic device also includes a processor for identifying differences between the first cache signature and the second cache signature. Further, the electronic device includes the processor for performing one of updating the broadcast table and updating a portion of the broadcast table.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: December 30, 2014
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Yogesh Manav, Mahantesh Sangappa Shettar
  • Patent number: 8843559
    Abstract: Using switching technologies to duplicate packets of a digital stream (e.g., digital video stream) sent from one workstation to multiple recipient workstations, where the switching technologies enable the multiple streams sent from the switch to the recipient workstations to be generated from a single digital stream sent from the sending workstation to the switch. Data units, such as video data units, may be transmitted by using a switch to enable receipt of a stream of data units including a payload portion and an attribute portion from at least two conferencing participants. The switch is used to duplicate at least a subportion of the payload portion of a data unit within the stream of data units, and to enable access to the duplicated subportion of the data unit by two or more conferencing participants.
    Type: Grant
    Filed: September 15, 2012
    Date of Patent: September 23, 2014
    Assignee: Facebook, Inc.
    Inventor: Scott K. Brown
  • Patent number: 8837651
    Abstract: An apparatus and a method for estimating a channel in a broadband wireless access system. A receiving apparatus includes a first channel estimation filter having a tap coefficient which is channel-adaptively variable, the first channel estimation filter acquiring a channel impulse response by filtering received pilot symbols, a second channel estimation filter having a fixed tap coefficient, the second channel estimation filter acquiring a channel impulse response by filtering received pilot symbols, and a selector which selects the operation of one of the first and the second channel estimation filters according to channel correlativity.
    Type: Grant
    Filed: August 23, 2007
    Date of Patent: September 16, 2014
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Jae-Hoon Jeon
  • Patent number: 8826093
    Abstract: Conserving power for coded transmissions comprises ceasing to process parity packets once associated data packets are deemed correct or corrected. Once data packets are deemed correct or corrected, the receiving unit can shut off during the transmission of parity packets.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: September 2, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Gordon Kent Walker, Chinnappa K. Ganapathy, Dhinakar Radhakrishnan, Fuyun Ling, Rajiv Vijayan
  • Patent number: 8811241
    Abstract: A communication device has a controller operatively connected to at least a first transceiver and a second transceiver, wherein the first transceiver receives signals on one or more channels within a first frequency band and the second transceiver transmits signals on one or more channels within a second frequency band, wherein the first and second frequency bands are adjacent one another so that each of the first and second frequency bands has an adjacent border and a nonadjacent border. Coexistence between the first and second transceivers is achieved by adjusting receive and/or transmit filters associated with the transceivers to create a guard band that is located more in the first frequency band if the second transceiver is using frequencies close to its adjacent border, and a guard band that is more in the second frequency band if the second transceiver is not using frequencies close to its adjacent border.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: August 19, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Leif Wilhelmsson, Erik Carlberg, Sven Mattisson, Hans Stattin