公开(公告)号：US20170372722A1

公开(公告)日：2017-12-28

申请号：US15189382

申请日：2016-06-22

申请人： Cisco Technology, Inc.

发明人： Xilin Li ,  Wei Li ,  Fuling Liu ,  Xinmin Yan

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

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

摘要： 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.

公开(公告)号：US09972337B2

公开(公告)日：2018-05-15

申请号：US15189382

申请日：2016-06-22

申请人： Cisco Technology, Inc.

发明人： Xilin Li ,  Wei Li ,  Fuling Liu ,  Xinmin Yan

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

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

摘要： 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.