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    Adaptive white noise gain control and equalization for differential microphone array
    1.
    发明授权
    Adaptive white noise gain control and equalization for differential microphone array 有权

    公开(公告)号：US10887685B1

    公开(公告)日：2021-01-05

    申请号：US16511737

    申请日：2019-07-15

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Charles B. Harmke ,  Kurt S. Fienberg ,  Daniel Grobe Sachs

    IPC: H04R1/32 ,  H04R3/00 ,  H04R3/04 ,  G10L21/0216

    Abstract: Systems and methods for beamforming audio signals received from a microphone array. One example embodiment provides an electronic device. The electronic device includes a microphone array and an electronic processor communicatively coupled to the microphone array. The electronic processor is configured to estimate an ambient noise level. The electronic processor is configured to compare the ambient noise level to a first threshold and a second threshold, the second threshold being lower than the first threshold. The electronic processor is configured to determine a beam pattern for the microphone array based on the comparison of the ambient noise level to the first threshold and the second threshold. The electronic processor is configured to apply the beam pattern to an audio signal received by the microphone array.

    Fault detection for microphone array
    3.
    发明授权
    Fault detection for microphone array 有权

    公开(公告)号：US10405115B1

    公开(公告)日：2019-09-03

    申请号：US15940293

    申请日：2018-03-29

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Daniel Landron ,  Kurt S. Fienberg

    IPC: H04R29/00

    Abstract: Reliable detection of a microphone failure along with corrective action are provided for a portable communication device having multiple microphones. The faulty microphone detection uses a correlation based metric between three (3) or more microphones. The approach is based on full cross correlation, including phase as well as magnitude, between unique microphone pairs for isolating a faulty microphone condition. The approach allows for the determination of precisely which microphone has failed and minimizes false triggers under windy conditions within a microphone array.

    Speaker-as-microphone for wind noise reduction
    5.
    发明授权
    Speaker-as-microphone for wind noise reduction 有权

    公开(公告)号：US11134341B1

    公开(公告)日：2021-09-28

    申请号：US16865900

    申请日：2020-05-04

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Kar Meng Tang ,  Kurt S. Fienberg ,  Geng Xiang Lee ,  Lian Kooi Ng ,  Thean Hai Ooi

    IPC: H04R3/00

    Abstract: A method and apparatus for processing audio signals. One system includes a communication device including a transceiver configured to send and receive audio data, and a microphone configured to convert sound waves to a first audio signal. A speaker is configured to convert received electrical signals to an acoustic output and is configured to convert sound waves to a second audio signal. An electronic processor connected to the microphone and the speaker is configured to receive the first audio signal from the microphone, receive the second audio signal from the speaker, determine a correlation value between the first audio signal and the second audio signal, and compare the correlation value to a correlation threshold. In response to the correlation value being below the correlation threshold, the electronic processor generates an output signal based on the first audio signal and the second audio signal, and transmits the output signal.

    Beam selection for body worn devices
    6.
    发明授权
    Beam selection for body worn devices 有权

    公开(公告)号：US10339950B2

    公开(公告)日：2019-07-02

    申请号：US15634158

    申请日：2017-06-27

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Kurt S. Fienberg ,  David Yeager

    IPC: G06F17/00 ,  G10L21/0216 ,  H04R1/40 ,  G10K11/34

    Abstract: Systems and methods for beamforming audio signals received from a microphone array. One method includes receiving, with an electronic processor communicatively coupled to the microphone array, a plurality of audio signals from the microphone array. The method includes generating a plurality of beams based on the plurality of audio signals. The method includes detecting that an electronic device is in a body-worn position. The method includes, in response to the device being in the body-worn position, determining at least one restricted direction based on the body-worn position. The method includes generating, for each of the plurality of beams, a likelihood statistic. The method includes, for each of the beams, assigning a weight to the likelihood statistic based on the at least one restricted direction to generate a weighted likelihood statistic. The method includes generating an output audio stream from the plurality of beams based on the weighted likelihood statistic.

    BEAM SELECTION FOR BODY WORN DEVICES
    7.
    发明申请
    BEAM SELECTION FOR BODY WORN DEVICES 审中-公开

    公开(公告)号：US20180374495A1

    公开(公告)日：2018-12-27

    申请号：US15634158

    申请日：2017-06-27

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Kurt S. Fienberg ,  David Yeager

    IPC: G10L21/0216 ,  H04R1/40 ,  G10K11/34

    CPC classification number: G10L21/0216 ,  G10K11/34 ,  G10L2021/02166 ,  H04R1/406 ,  H04R3/005 ,  H04R2410/01 ,  H04R2420/07 ,  H04R2430/20

    Abstract: Systems and methods for beamforming audio signals received from a microphone array. One method includes receiving, with an electronic processor communicatively coupled to the microphone array, a plurality of audio signals from the microphone array. The method includes generating a plurality of beams based on the plurality of audio signals. The method includes detecting that an electronic device is in a body-worn position. The method includes, in response to the device being in the body-worn position, determining at least one restricted direction based on the body-worn position. The method includes generating, for each of the plurality of beams, a likelihood statistic. The method includes, for each of the beams, assigning a weight to the likelihood statistic based on the at least one restricted direction to generate a weighted likelihood statistic. The method includes generating an output audio stream from the plurality of beams based on the weighted likelihood statistic.

    ADAPTIVE WHITE NOISE GAIN CONTROL AND EQUALIZATION FOR DIFFERENTIAL MICROPHONE ARRAY
    8.
    发明申请
    ADAPTIVE WHITE NOISE GAIN CONTROL AND EQUALIZATION FOR DIFFERENTIAL MICROPHONE ARRAY 有权

    公开(公告)号：US20210021927A1

    公开(公告)日：2021-01-21

    申请号：US16511737

    申请日：2019-07-15

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Charles B. Harmke ,  Kurt S. Fienberg ,  Daniel Grobe Sachs

    IPC: H04R1/32 ,  H04R3/00 ,  H04R3/04 ,  G10L21/0216

    Abstract: Systems and methods for beamforming audio signals received from a microphone array. One example embodiment provides an electronic device. The electronic device includes a microphone array and an electronic processor communicatively coupled to the microphone array. The electronic processor is configured to estimate an ambient noise level. The electronic processor is configured to compare the ambient noise level to a first threshold and a second threshold, the second threshold being lower than the first threshold. The electronic processor is configured to determine a beam pattern for the microphone array based on the comparison of the ambient noise level to the first threshold and the second threshold. The electronic processor is configured to apply the beam pattern to an audio signal received by the microphone array.

    Method and system for acoustic feedback cancellation using a known full band sequence
    9.
    发明授权
    Method and system for acoustic feedback cancellation using a known full band sequence 有权

    公开(公告)号：US10530936B1

    公开(公告)日：2020-01-07

    申请号：US16354565

    申请日：2019-03-15

    Applicant: MOTOROLA SOLUTIONS, INC.

    Inventor： Vahid Khanagha ,  Kurt S. Fienberg

    IPC: H04M9/08 ,  H04R3/04 ,  G10L25/21 ,  H04R3/02

    Abstract: Systems and methods for acoustic feedback cancellation. One method includes transmitting, with a transceiver, a known full-band sequence at a first time. The method includes receiving, via a microphone, a received audio signal including a received copy of the known full-band sequence. The method includes filtering the received audio signal to generate a filtered audio signal, and detecting, based on the filtered audio signal, a second portable communication device in proximity to the portable communication device. The method includes, in response to detecting the second portable communication device, determining, based on the first time and filtered audio signal, an estimated loop delay. The method includes initializing an adaptive feedback cancellation filter based on the estimated loop delay and the plurality of estimated filter coefficients. The method includes determining a plurality of estimated filter coefficients based on the known full-band sequence and the received copy of the known full-band sequence.

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