公开(公告)号：US20180172502A1

公开(公告)日：2018-06-21

申请号：US15580242

申请日：2016-07-06

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Dong SHI ,  David GUNAWAN ,  Glenn N. DICKINS ,  Kai LI

IPC: G01H7/00 ,  G10L25/21 ,  H04R1/40 ,  H04R3/00

CPC classification number: G01H7/00 ,  G10L25/21 ,  H04R1/406 ,  H04R3/005

Abstract: Example embodiments disclosed herein relate to a estimation of reverberant energy components from audio sources. A method of estimating a reverberant energy component from an active audio source (100) is disclosed. The method comprises determining a correspondence between the active audio source and a plurality of sample sources by comparing one or more spatial features of the active audio source with one or more spatial features of the plurality of sample sources, each of the sample sources being associated with an adaptive filtering model (101); obtaining an adaptive filtering model for the active audio source based on the determined correspondence (102); and estimating the reverberant energy component from the active audio source over time based on the adaptive filtering model (103). Corresponding system (800) and computer program product (900) are also disclosed.

公开(公告)号：US20160019909A1

公开(公告)日：2016-01-21

申请号：US14775038

申请日：2014-03-10

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Dong SHI ,  Xuejing SUN ,  Glenn N. DICKINS

IPC: G10L21/0232 ,  G10L25/60 ,  H04M9/08 ,  G10L25/21

CPC classification number: G10L21/0232 ,  G10L21/0208 ,  G10L25/21 ,  G10L25/60 ,  G10L2021/02082 ,  G10L2021/02163 ,  H04M9/082

Abstract: The present application provides an acoustic echo mitigation apparatus and method, an audio processing apparatus and a voice communication terminal. According to an embodiment, an acoustic echo mitigation apparatus is provided, including: an acoustic echo canceller for cancelling estimated acoustic echo from a microphone signal and outputting an error signal; a residual echo estimator for estimating residual echo power; and an acoustic echo suppressor for further suppressing residual echo and noise in the error signal based on the residual echo power and noise power. Here, the residual echo estimator is configured to be continuously adaptive to power change in the error signal. According to the embodiments of the present application, the acoustic echo mitigation apparatus and method can, at least, be well adaptive to the change of power of the error signal after the AEC processing, such as that caused by change of double-talk status, echo path properties, noise level and etc.

Abstract translation: 本申请提供了一种声学回声减轻装置和方法，音频处理装置和语音通信终端。 根据一个实施例，提供了一种声学回声消除装置，包括：声学回声消除器，用于从麦克风信号中消除估计的声学回声并输出误差信号; 用于估计残余回波功率的残余回波估计器; 以及声学回波抑制器，用于基于残余回波功率和噪声功率进一步抑制误差信号中的残余回波和噪声。 这里，残差回波估计器被配置为连续地适应于误差信号中的功率变化。 根据本申请的实施例，声学回声缓解装置和方法至少可以很好地适应于AEC处理之后的误差信号的功率变化，例如由双方通话状态的改变引起的， 回波路径属性，噪声水平等

公开(公告)号：US20210104254A1

公开(公告)日：2021-04-08

申请号：US17075659

申请日：2020-10-20

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Dong SHI ,  Kai LI ,  Hannes MUESCH ,  David GUNAWAN ,  Paul HOLMBERG ,  Glenn N. DICKINS

IPC: G10L21/0232 ,  H04R3/02 ,  G10L21/0264 ,  H04R3/04

Abstract: Methods for echo estimation or echo management (echo suppression or cancellation) on an input audio signal, with at least one of adaptation of a sparse prediction filter set, modification (for example, truncation) of adapted prediction filter impulse responses, generation of a composite impulse response from adapted prediction filter impulse responses, or use of echo estimation and/or echo management resources in a manner determined at least in part by classification of the input audio signal as being (or not being) echo free. Other aspects are systems configured to perform any embodiment of any of the methods.

公开(公告)号：US20190387316A1

公开(公告)日：2019-12-19

申请号：US16554654

申请日：2019-08-29

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Dong SHI ,  Xuejing SUN

IPC: H04R3/04 ,  G10L25/18 ,  H03G5/02 ,  H03G3/30 ,  G10L25/48 ,  G10L25/21 ,  H03G5/16 ,  G10L21/0232 ,  G10L21/02 ,  G06F3/16

Abstract: Example embodiments disclosed herein relate to separated audio analysis and processing. A system for processing an audio signal is disclosed. The system includes an audio analysis module configured to analyze an input audio signal to determine a processing parameter for the input audio signal, the input audio signal being represented in time domain. The system also includes an audio processing module configured to process the input audio signal in parallel with the audio analysis module. The audio processing module includes a time domain filter configured to filter the input audio signal to obtain an output audio signal in the time domain, and a filter controller configured to control a filter coefficient of the time domain filter based on the processing parameter determined by the audio analysis module. Corresponding method and computer program product of processing an audio signal are also disclosed.

公开(公告)号：US20180374496A1

公开(公告)日：2018-12-27

申请号：US16063225

申请日：2016-12-15

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Dong SHI ,  David GUNAWAN ,  Glenn N. DICKINS

IPC: G10L21/0264 ,  A61B7/00 ,  G10L21/0232 ,  G10L25/21 ,  G10L25/51 ,  G10L21/0324 ,  H04M3/56

Abstract: Example embodiments disclosed herein relate to audio signal processing. A method of processing an audio signal is disclosed. The method includes detecting, based on a power distribution of the audio signal, a type of content of a frame of the audio signal, generating a first gain based on a sound level of the frame for adjusting the sound level, processing the audio signal by applying the first gain to the frame; and in response to the type of content being detected to be a breath sound, generating a second gain for mitigating the breath sound and processing the audio signal by applying the second gain to the frame. Corresponding system and computer program product are also disclosed.

公开(公告)号：US20180301157A1

公开(公告)日：2018-10-18

申请号：US15569555

申请日：2016-04-27

Applicant: Dolby Laboratories Licensing Corporation

Inventor： David GUNAWAN ,  Dong SHI ,  Glenn N. DICKINS

IPC: G10L21/0208 ,  H04R1/32 ,  G10L21/034

CPC classification number: G10L21/0208 ,  G10L21/034 ,  G10L25/48 ,  H04R1/326 ,  H04R2410/03

Abstract: Example embodiments disclosed herein relate to impulsive noise suppression. A method of impulsive noise suppression in an audio signal is disclosed. The method includes determining an impulsive noise related feature from a current frame of the audio signal. The method also includes detecting an impulsive noise in the current frame based on the impulsive noise related feature, and in response to detecting the impulsive noise in the current frame, applying a suppression gain to the current frame to suppress the impulsive noise. Corresponding system and computer program product of impulsive noise suppression in an audio signal are also disclosed.

公开(公告)号：US20190392855A1

公开(公告)日：2019-12-26

申请号：US16564532

申请日：2019-09-09

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Dong SHI ,  Glenn N. DICKINS ,  David GUNAWAN ,  Xuejing SUN

IPC: G10L21/0232 ,  G10L21/0208 ,  H04M9/08 ,  G10L21/028 ,  G10L25/21

Abstract: In an audio processing system (300), a filtering section (350, 400): receives subband signals (410, 420, 430) corresponding to audio content of a reference signal (301) in respective frequency subbands; receives subband signals (411, 421, 431) corresponding to audio content of a response signal (304) in the respective subbands; and forms filtered inband references (412, 422, 432) by applying respective filters (413, 423, 433) to the subband signals of the reference signal. For a frequency subband: filtered crossband references (424, 425) are formed by multiplying, by scalar factors (426, 427), filtered inband references of other subbands; a composite filtered reference (428) is formed by summing the filtered inband reference of the subband (422) and the filtered crossband references; a residual signal (429) is computed as a difference between the composite filtered reference and the subband signal of the response signal corresponding to the subband; and the scalar factors and the filter applied to the subband signal of the reference signal corresponding to the subband are adjusted based on the residual signal.

公开(公告)号：US20190325891A1

公开(公告)日：2019-10-24

申请号：US16404611

申请日：2019-05-06

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Dong SHI ,  Xuejing SUN

IPC: G10L25/18 ,  H03H21/00 ,  H03H17/02 ,  G10L25/48

Abstract: Example embodiments disclosed herein relate to filter coefficient updating in time domain filtering. A method of processing an audio signal is disclosed. The method includes obtaining a predetermined number of target gains for a first portion of the audio signal by analyzing the first portion of the audio signal. Each of the target gains is corresponding to a subband of the audio signal. The method also includes determining filter coefficients for time domain filtering the first portion of the audio signal so as to approximate a frequency response given by the target gains. The filter coefficients are determined by iteratively selecting at least one target gain from the target gains and updating the filter coefficient based on the selected at least one target gain. Corresponding system and computer program product for processing an audio signal are also disclosed.

公开(公告)号：US20180075862A1

公开(公告)日：2018-03-15

申请号：US15558181

申请日：2016-03-21

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Dong SHI ,  Glenn N. DICKINS ,  David GUNAWAN ,  Xuejing SUN

IPC: G10L21/0232 ,  G10L21/028 ,  G10L25/21

CPC classification number: G10L21/0232 ,  G10L21/0208 ,  G10L21/028 ,  G10L25/21 ,  G10L2021/02082 ,  H04M9/082

Abstract: In an audio processing system (300), a filtering section (350, 400): receives subband signals (410, 420, 430) corresponding to audio content of a reference signal (301) in respective frequency subbands; receives subband signals (411, 421, 431) corresponding to audio content of a response signal (304) in the respective subbands; and forms filtered inband references (412, 422, 432) by applying respective filters (413, 423, 433) to the subband signals of the reference signal. For a frequency subband: filtered crossband references (424, 425) are formed by multiplying, by scalar factors (426, 427), filtered inband references of other subbands; a composite filtered reference (428) is formed by summing the filtered inband reference of the subband (422) and the filtered crossband references; a residual signal (429) is computed as a difference between the composite filtered reference and the subband signal of the response signal corresponding to the subband; and the scalar factors and the filter applied to the subband signal of the reference signal corresponding to the subband are adjusted based on the residual signal.

公开(公告)号：US20150371654A1

公开(公告)日：2015-12-24

申请号：US14409948

申请日：2013-06-27

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Craig JOHNSTON ,  Dong SHI ,  Xuejing SUN ,  Glenn N. DICKINS

IPC: G10L21/0208 ,  G10L21/0232

CPC classification number: G10L21/0208 ,  G10L21/0232 ,  G10L2021/02082 ,  H04M9/082

Abstract: A method (800) for determining an estimate (215, 261) of an echo path property of an electronic device (200, 250, 300, 600). The electronic device is configured to render a total audio signal using a loudspeaker (102), and the electronic device is configured to record an echo of the rendered audio signal using a microphone (103), thereby yielding a recorded audio signal (112). The method comprises inserting (801), in an inaudible manner, an auxiliary audio signal (212) into the total audio signal to be rendered; wherein the auxiliary audio signal (212) comprises a tonal audio signal at a first frequency; isolating (803) the echo of the auxiliary audio signal (212) from the recorded audio signal (112); and determining (804) the estimate (215, 261) of the echo path property based on the inserted auxiliary audio signal (212) and based on the isolated echo of the auxiliary audio signal (212).

Abstract translation: 一种用于确定电子设备（200,250,300,600）的回波路径属性的估计（215,261）的方法（800）。 电子设备被配置为使用扬声器（102）呈现总音频信号，并且电子设备被配置为使用麦克风（103）记录所呈现的音频信号的回声，从而产生记录的音频信号（112）。 该方法包括以无法听见的方式将辅助音频信号（212）插入（801）到要渲染的总音频信号中; 其中所述辅助音频信号（212）包括第一频率的音调音频信号; 从所记录的音频信号（112）隔离（803）辅助音频信号（212）的回波; 以及基于所插入的辅助音频信号（212）并且基于所述辅助音频信号（212）的隔离回波来确定（804）所述回波路径属性的估计（215,261）。