公开(公告)号：US11205438B1

公开(公告)日：2021-12-21

申请号：US16538981

申请日：2019-08-13

Applicant: Amazon Technologies, Inc.

Inventor： Amit Chhetri

IPC: G10L21/0232 ,  H04R1/40 ,  H04R3/00 ,  G10L25/84 ,  G10L15/22 ,  G10L15/20 ,  H04R3/04 ,  G10L21/0208

Abstract: A device capable of motion includes an acoustic echo canceller for cancelling a reference signal from received audio data. The device updates an adaptive filter as the device moves to reflect the changing audio channel between a loudspeaker and a microphone of the device. A step size for changing coefficients of the filter is determined based on its velocity. A number of iterations for updating the filter using a frame of audio data is also determined based on the velocity.

公开(公告)号：US11159878B1

公开(公告)日：2021-10-26

申请号：US16541943

申请日：2019-08-15

Applicant: Amazon Technologies, Inc.

Inventor： Navin Chatlani ,  Amit Chhetri ,  Ananth Raghavendra ,  Srivatsan Kandadai

IPC: H04R3/00 ,  H04R1/40 ,  G06F3/14

Abstract: A device capable of moving a component of the device motion is capable of determining audio data corresponding to a direction relative to the device (“beamforming”). When the component moves, the device determines a new position of the component and selects one of a set of beamforming filter coefficients corresponding to the position. Using the filter coefficients, the device determines the directional audio data.

公开(公告)号：US09319783B1

公开(公告)日：2016-04-19

申请号：US14184336

申请日：2014-02-19

Applicant: Amazon Technologies, Inc.

Inventor： William Folwell Barton ,  Amit Chhetri

IPC: H04B3/20 ,  H04B15/00 ,  H04R3/00 ,  G10L21/0208 ,  H04M9/08

CPC classification number: H04M9/082 ,  G10L15/20 ,  G10L21/0208 ,  G10L2021/02082 ,  H04S2400/13

Abstract: Residual echo that remains after an echo cancellation process may interfere with speech recognition. If near-end speech is detected in an audio input signal, a controller may attenuate the audio playback signal. Too much attenuation may disturb playback, whereas too little attenuation may not improve speech recognition. Accordingly, features are disclosed for attenuating an audio playback signal based at least in part on residual echo level.

Abstract translation: 回波消除过程之后残留的回波可能会干扰语音识别。 如果在音频输入信号中检测到近端语音，则控制器可以衰减音频回放信号。 衰减太多可能会影响播放，而衰减太小可能无法改善语音识别。 因此，公开了用于至少部分地基于残余回波水平来衰减音频回放信号的特征。