公开(公告)号：US09653060B1

公开(公告)日：2017-05-16

申请号：US15019108

申请日：2016-02-09

Applicant: Amazon Technologies, Inc.

Inventor： Philip Ryan Hilmes ,  Robert Ayrapetian

IPC: G10K11/00 ,  G10L21/0272 ,  G10L15/22 ,  G10L21/0208

CPC classification number: H04M9/082 ,  G10K2210/3012 ,  G10L2015/223 ,  G10L2021/02082 ,  G10L2021/02166

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.

公开(公告)号：US09554210B1

公开(公告)日：2017-01-24

申请号：US14750540

申请日：2015-06-25

Applicant: Amazon Technologies, Inc.

Inventor： Robert Ayrapetian ,  Michael Alan Pogue ,  Kenneth Edgar Hild, II

IPC: H04B3/20 ,  H04R3/00

CPC classification number: H04R3/002 ,  G10L21/0208 ,  G10L2021/02082 ,  H04M9/082 ,  H04R3/02

Abstract: A multi-channel echo cancellation system that dynamically adapts to changes in acoustic conditions. The system does not require a sequence of “start-up” tones to determine the impulse responses. Rather, the adaptive filters approximate estimated transfer functions for each channel. A secondary adaptive filter adjusts cancellation to adapt to changes in the actual transfer functions over time after the adaptive filters have been trained, even if the reference signals are not unique relative to each other.

Abstract translation: 多声道回声消除系统，动态适应声学条件的变化。 该系统不需要一系列“启动”音来确定脉冲响应。 相反，自适应滤波器近似估计每个信道的传递函数。 辅助自适应滤波器调整取消以适应自适应滤波器已被训练之后随时间推移的实际传递函数的变化，即使参考信号彼此不是唯一的。

公开(公告)号：US09472203B1

公开(公告)日：2016-10-18

申请号：US14753979

申请日：2015-06-29

Applicant: Amazon Technologies, Inc.

Inventor： Robert Ayrapetian ,  Arnaud Jean-Louis Charton ,  Yuwen Su

IPC: H04B3/20 ,  G10L21/0208 ,  H04R3/02 ,  G10K11/16 ,  H04R3/12

CPC classification number: H04R3/12 ,  H04M9/082 ,  H04R3/02 ,  H04R2227/007 ,  H04R2420/07 ,  H04S7/301 ,  H04S7/305

Abstract: An acoustic echo cancellation (AEC) system that detects and compensates for differences in sample rates between the AEC system and a set of wireless speakers based on a search-based trial-and-error technique. The system individually determines a frequency offset for each microphone-speaker pair using an iterative process, determining an echo-return loss enhancement (ERLE) value for each offset that is tried, and selecting the frequency offset associated with the largest ERLE value.

Abstract translation: 声学回声消除（AEC）系统，其基于基于搜索的试错技术来检测和补偿AEC系统和一组无线扬声器之间的采样率的差异。 该系统使用迭代过程单独地确定每个麦克风 - 扬声器对的频率偏移，确定所尝试的每个偏移的回波回波损耗增强（ERLE）值，以及选择与最大ERLE值相关联的频率偏移。

公开(公告)号：US09246545B1

公开(公告)日：2016-01-26

申请号：US14251393

申请日：2014-04-11

Applicant: Amazon Technologies, Inc.

Inventor： Robert Ayrapetian ,  Yuwen Su ,  Arnaud Jean-Louis Charton

IPC: H04B3/20 ,  H04B3/23 ,  H04M9/08 ,  G10K11/178

CPC classification number: H04B3/23 ,  H04M9/082

Abstract: Features are disclosed for adaptively estimating propagation delay in an audio system. A first device in communication with a speaker may be configured produce sound based on an audio playback signal. A second device in communication with one or more microphones may be configured to detect sound as a microphone signal. The second device may perform acoustic echo cancellation using a first propagation delay parameter and determine a first echo return loss enhancement. The second device may perform acoustic echo cancellation using a second propagation delay parameter and determine a second echo return loss enhancement. A propagation delay between the audio playback signal and the microphone signal may be adaptively estimated based on a comparison of the first and second echo return loss enhancements.

Abstract translation: 公开了用于自适应地估计音频系统中的传播延迟的特征。 可以配置与扬声器通信的第一设备，其基于音频回放信号产生声音。 与一个或多个麦克风通​​信的第二设备可以被配置为检测作为麦克风信号的声音。 第二设备可以使用第一传播延迟参数来执行声学回声消除并且确定第一回波回波损耗增强。 第二装置可以使用第二传播延迟参数执行声学回波消除，并且确定第二回波回波损耗增强。 可以基于第一和第二回波损耗增强的比较来自适应地估计音频回放信号和麦克风信号之间的传播延迟。

公开(公告)号：US09219456B1

公开(公告)日：2015-12-22

申请号：US14109756

申请日：2013-12-17

Applicant: Amazon Technologies, Inc.

Inventor： Robert Ayrapetian ,  Yuwen Su ,  Arnaud Jean-Louis Charton

IPC: H03G5/00 ,  H04B3/20 ,  H03G3/00 ,  H04B3/23 ,  H04M9/08

CPC classification number: G10L21/055 ,  G10L19/06 ,  G10L21/0232 ,  H03G3/00 ,  H04B3/23 ,  H04M9/08 ,  H04M9/082

Abstract: Features are disclosed for measuring and correcting clock drift and propagation delay in an audio system through one or more waveforms embedded in an audio signal. A first device in communication with a speaker may be configured to obtain an audio signal and insert one or more waveforms into the audio signal. For example, the waveforms may be inserted during an interval of time. A second device in communication with a microphone may be configured to detect sound as an audio input signal. The second device may obtain a spectral representation of the audio input signal and determine a rotation based on the spectral representation at the frequency of at least one of the inserted waveforms. Clock drift may be determined based on the rotation.

Abstract translation: 公开了用于通过嵌入在音频信号中的一个或多个波形来测量和校正音频系统中的时钟漂移和传播延迟的特征。 与扬声器通信的第一设备可以被配置为获得音频信号并将一个或多个波形插入到音频信号中。 例如，可以在一段时间间隔期间插入波形。 与麦克风通信的第二设备可以被配置为检测声音作为音频输入信号。 第二设备可以获得音频输入信号的频谱表示，并且基于在至少一个插入波形的频率处的频谱表示来确定旋转。 时钟漂移可以基于旋转来确定。