公开(公告)号：US09363600B2

公开(公告)日：2016-06-07

申请号：US14289378

申请日：2014-05-28

Applicant: Apple Inc.

Inventor： Qing Yang ,  Sean Anthony Ramprashad

IPC: H04R3/00 ,  H04R3/02 ,  H04M9/08

CPC classification number: H04R3/02 ,  H04M9/08

Abstract: A system and method is described for estimating residual echo and performing residual echo suppression on a signal. In particular, the system and method described herein: 1) provides a more accurate coherence-based approach where the sub-band nature of coherence-based residual echo estimation is leveraged using sub-band-based coherence measures and upper-bound envelopes to guide residual echo estimates; 2) provides joint estimation of the residual echo and a background stationary noise-floor; 3) provides more accurate residual echo estimation by combining the above two measures with information on near-end activity to selectively adjust the residual-echo estimation in sub-bands; and 4) provides improved control of near-end distortion by leveraging the noise-floor estimate and the internally calculated signal-to-echo ratios as additional guides/limits to help balance, flexibly, and as needed, near-end distortion with residual echo suppression. The resultant residual echo suppressor design provides significant improvement in both residual echo suppression and background noise preservation.

Abstract translation: 描述了用于估计残余回波并对信号执行残余回波抑制的系统和方法。 特别地，本文描述的系统和方法：1）提供更准确的基于相干性的方法，其中基于相干的残差回波估计的子带性质利用基于子带的一致性测量和上限的包络来引导 残差回波估计; 2）提供残差回波和背景固定噪声基底的联合估计; 3）通过将上述两种措施与近端活动信息相结合，提供更精确的残余回波估计，以选择性地调整子带中的残余回波估计; 和4）通过利用噪声层估计和内部计算的信号与回波比作为附加指南/限制来提供对近端失真的改进的控制，以帮助平衡，灵活地并且根据需要具有残余回波的近端失真 抑制。 所得到的残留回波抑制器设计提供了残留回波抑制和背景噪声保护的显着改进。

公开(公告)号：US11114109B2

公开(公告)日：2021-09-07

申请号：US16785480

申请日：2020-02-07

Applicant: Apple Inc.

Inventor： Nicholas J. Bryan ,  Qing Yang ,  Vasu Iyengar

IPC: G10L21/0216 ,  H04R3/00 ,  G10L21/0208

Abstract: A device implementing a system for mitigating noise includes at least one processor configured to receive a first audio signal corresponding to a first microphone, and determine whether wind noise is present based at least in part on the first audio signal. The processor is configured to select, based on the determining, a second audio signal from between second and third microphones. The second microphone is disposed at a location that experiences less echo coupling when the device is in a particular orientation with respect to a user. The third microphone is disposed at another location that experiences less wind noise. The processor is configured to determine voice and noise reference values based on the first and the selected second audio signals, and perform noise suppression with respect to at least one of the first or the selected second audio signal, based on the voice or the noise reference value.

公开(公告)号：US09503815B2

公开(公告)日：2016-11-22

申请号：US14289437

申请日：2014-05-28

Applicant: Apple Inc.

Inventor： Sean Anthony Ramprashad ,  Qing Yang

IPC: H04R3/00 ,  H04R3/02 ,  H04M9/08 ,  H04M19/08

CPC classification number: H04R3/02 ,  H04M9/08 ,  H04M19/08

Abstract: To address issues with present echo gate control, a method and apparatus for more intelligently operating an echo gate is described herein. In particular, the decision of whether to mute an uplink signal, or not, is formulated herein as primarily a perceptual decision based on an appropriate analysis of the perceptual interaction of the current residual echo and the current near-end signal(s). By doing so, the application of muting through an echo gate may be minimized and/or more appropriately engaged. This will lead to fewer dropouts and muting of speech onsets and offsets 1) during periods such as double-talk or 2) during periods of downlink playback in the presence of low near-end signal levels, two cases of particular importance.

Abstract translation: 为了解决当前回波门控制的问题，本文描述了用于更智能地操作回波门的方法和装置。 特别地，基于对当前残余回声和当前近端信号的感知交互的适当分析，本文中将基于上行链路信号的静音的决定在此形成为主要的感知决定。 通过这样做，通过回波门的静音的应用可以被最小化和/或更适当地接合。 两种情况尤其重要，这将导致在较低的近端信号电平存在的情况下，在下行链路重放的时段期间，诸如双向通话或2）期间的语音丢失和偏移量的丢失和静音1）。

公开(公告)号：US20150350777A1

公开(公告)日：2015-12-03

申请号：US14289378

申请日：2014-05-28

Applicant: Apple Inc.

Inventor： Qing Yang ,  Sean Anthony Ramprashad

IPC: H04R3/00

CPC classification number: H04R3/02 ,  H04M9/08

Abstract: A system and method is described for estimating residual echo and performing residual echo suppression on a signal. In particular, the system and method described herein: 1) provides a more accurate coherence-based approach where the sub-band nature of coherence-based residual echo estimation is leveraged using sub-band-based coherence measures and upper-bound envelopes to guide residual echo estimates; 2) provides joint estimation of the residual echo and a background stationary noise-floor; 3) provides more accurate residual echo estimation by combining the above two measures with information on near-end activity to selectively adjust the residual-echo estimation in sub-bands; and 4) provides improved control of near-end distortion by leveraging the noise-floor estimate and the internally calculated signal-to-echo ratios as additional guides/limits to help balance, flexibly, and as needed, near-end distortion with residual echo suppression. The resultant residual echo suppressor design provides significant improvement in both residual echo suppression and background noise preservation.

Abstract translation: 描述了用于估计残余回波并对信号执行残余回波抑制的系统和方法。 特别地，本文描述的系统和方法：1）提供更准确的基于相干性的方法，其中基于相干的残差回波估计的子带性质利用基于子带的一致性测量和上限的包络来引导 残差回波估计; 2）提供残差回波和背景固定噪声基底的联合估计; 3）通过将上述两种措施与近端活动信息相结合，提供更精确的残余回波估计，以选择性地调整子带中的残余回波估计; 和4）通过利用噪声层估计和内部计算的信号与回波比作为附加指南/限制来提供对近端失真的改进的控制，以帮助平衡，灵活地并且根据需要具有残余回波的近端失真 抑制。 所得到的残留回波抑制器设计提供了残留回波抑制和背景噪声保护的显着改进。

公开(公告)号：US20150350778A1

公开(公告)日：2015-12-03

申请号：US14289437

申请日：2014-05-28

Applicant: Apple Inc.

Inventor： Sean Anthony Ramprashad ,  Qing Yang

IPC: H04R3/00

CPC classification number: H04R3/02 ,  H04M9/08 ,  H04M19/08

Abstract: To address issues with present echo gate control, a method and apparatus for more intelligently operating an echo gate is described herein. In particular, the decision of whether to mute an uplink signal, or not, is formulated herein as primarily a perceptual decision based on an appropriate analysis of the perceptual interaction of the current residual echo and the current near-end signal(s). By doing so, the application of muting through an echo gate may be minimized and/or more appropriately engaged. This will lead to fewer dropouts and muting of speech onsets and offsets 1) during periods such as double-talk or 2) during periods of downlink playback in the presence of low near-end signal levels, two cases of particular importance.

Abstract translation: 为了解决当前回波门控制的问题，本文描述了用于更智能地操作回波门的方法和装置。 特别地，基于对当前残余回声和当前近端信号的感知交互的适当分析，本文中将基于上行链路信号的静音的决定在此形成为主要的感知决定。 通过这样做，通过回波门的静音的应用可以被最小化和/或更适当地接合。 两种情况尤其重要，这将导致在较低的近端信号电平存在的情况下，在下行链路重放的时段期间，诸如双向通话或2）期间的语音丢失和偏移量的丢失和静音1）。