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    Acoustic echo cancellation with delay uncertainty and delay change
    1.
    发明授权
    Acoustic echo cancellation with delay uncertainty and delay change 有权

    公开(公告)号：US09972337B2

    公开(公告)日：2018-05-15

    申请号：US15189382

    申请日：2016-06-22

    Applicant: Cisco Technology, Inc.

    Inventor： Xilin Li ,  Wei Li ,  Fuling Liu ,  Xinmin Yan

    IPC: H04M9/08 ,  G10L21/0264 ,  G10L25/06 ,  G10L25/72 ,  G10L21/0232 ,  G10L21/0208

    CPC classification number: G10L21/0264 ,  G10L21/0232 ,  G10L25/06 ,  G10L25/72 ,  G10L2021/02082 ,  H04B3/23 ,  H04M9/082

    Abstract: An echo cancellation method includes receiving an echo reference signal, receiving a microphone signal, decomposing, with a first filter bank, the echo reference signal into a series of subband echo reference signals, decomposing, with a second filter bank, the microphone signal into a series of subband microphone signals, estimating a group delay between the echo reference signal and the microphone signal using the series of subband echo reference signals and the series of subband microphone signals, estimating, using adaptive filters, acoustic echoes in the echo reference signal based at least in part on the group delay, subtracting the acoustic echoes from the series of subband microphone signals to obtain a series of acoustic echo removed subband signals, combining the series of acoustic echo removed subband signals into a single time domain echo removed signal, and sending the single time domain echo removed signal to a host operating system.

    ACOUSTIC ECHO CANCELLATION WITH DELAY UNCERTAINTY AND DELAY CHANGE
    2.
    发明申请
    ACOUSTIC ECHO CANCELLATION WITH DELAY UNCERTAINTY AND DELAY CHANGE 有权

    公开(公告)号：US20170372722A1

    公开(公告)日：2017-12-28

    申请号：US15189382

    申请日：2016-06-22

    Applicant: Cisco Technology, Inc.

    Inventor： Xilin Li ,  Wei Li ,  Fuling Liu ,  Xinmin Yan

    IPC: G10L21/0264 ,  G10L25/06 ,  G10L25/72 ,  G10L21/0232 ,  G10L21/0208

    CPC classification number: G10L21/0264 ,  G10L21/0232 ,  G10L25/06 ,  G10L25/72 ,  G10L2021/02082 ,  H04B3/23 ,  H04M9/082

    Abstract: An echo cancellation method includes receiving an echo reference signal, receiving a microphone signal, decomposing, with a first filter bank, the echo reference signal into a series of subband echo reference signals, decomposing, with a second filter bank, the microphone signal into a series of subband microphone signals, estimating a group delay between the echo reference signal and the microphone signal using the series of subband echo reference signals and the series of subband microphone signals, estimating, using adaptive filters, acoustic echoes in the echo reference signal based at least in part on the group delay, subtracting the acoustic echoes from the series of subband microphone signals to obtain a series of acoustic echo removed subband signals, combining the series of acoustic echo removed subband signals into a single time domain echo removed signal, and sending the single time domain echo removed signal to a host operating system.

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