公开(公告)号：US11308976B2

公开(公告)日：2022-04-19

申请号：US17156485

申请日：2021-01-22

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Xuejing Sun ,  Glenn N. Dickins

IPC: G10L21/14 ,  G10L21/0364 ,  G10L21/0316 ,  G10K11/16 ,  H03G3/32 ,  G10L21/0224 ,  G10L21/034 ,  G10L25/78 ,  H03G3/30 ,  G10L21/02

Abstract: A method, an apparatus, and logic to post-process raw gains determined by input processing to generate post-processed gains, comprising using one or both of delta gain smoothing and decision-directed gain smoothing. The delta gain smoothing comprises applying a smoothing filter to the raw gain with a smoothing factor that depends on the gain delta: the absolute value of the difference between the raw gain for the current frame and the post-processed gain for a previous frame. The decision-directed gain smoothing comprises converting the raw gain to a signal-to-noise ratio, applying a smoothing filter with a smoothing factor to the signal-to-noise ratio to calculate a smoothed signal-to-noise ratio, and converting the smoothed signal-to-noise ratio to determine the second smoothed gain, with smoothing factor possibly dependent on the gain delta.

公开(公告)号：US10410653B2

公开(公告)日：2019-09-10

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: G10L19/00 ,  G10L21/0232 ,  G10L21/0208 ,  G10L21/028 ,  G10L25/21 ,  H04M9/08

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：US10405093B2

公开(公告)日：2019-09-03

申请号：US15577618

申请日：2016-05-26

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Dong Shi ,  Xuejing Sun

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

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：US10356524B2

公开(公告)日：2019-07-16

申请号：US15842313

申请日：2017-12-14

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guilin Ma ,  Xiguang Zheng ,  Chen Zhang ,  Xuejing Sun

IPC: H04R29/00 ,  H04R3/04 ,  H04R3/00 ,  H04S7/00 ,  G10L21/0232 ,  H04R1/40 ,  H04M1/60 ,  H04R1/32 ,  G10L21/0216

Abstract: Example embodiments disclosed herein relate to user experience oriented audio signal processing. There is provided a method for user experience oriented audio signal processing. The method includes obtaining a first audio signal from an audio sensor of an electronic device; computing, based on the first audio signal, a compensation factor for an acoustic path from the electronic device to a listener and applying the compensation factor to a second audio signal outputted from the electronic device. Corresponding system and computer program products are disclosed.

公开(公告)号：US10224046B2

公开(公告)日：2019-03-05

申请号：US14774966

申请日：2014-03-04

Applicant: DOLBY LABORATORIES LICENSING CORPORATION ,  DOLBY INTERNATIONAL AB

Inventor： Glenn N. Dickins ,  Xuejing Sun ,  Yen-Liang Shue ,  Heiko Purnhagen

IPC: G10L19/012 ,  H04L12/18 ,  G10L21/0208 ,  H04M3/56 ,  G10L19/008

Abstract: A method, an apparatus, logic (e.g., executable instructions encoded in a non-transitory computer-readable medium to carry out a method), and a non-transitory computer-readable medium configured with such instructions. The method is to generate and spatially render spatial comfort noise at a receiving endpoint of a conference system, such that the comfort noise has target spectral characteristics typical of comfort noise, and at least one spatial property that at least substantially matches at least one target spatial property. On version includes receiving one or more or more audio signals from other endpoints, combining the received audio signals with the spatial comfort noise signals, and rendering the combination of the received audio signals and the spatial comfort noise signals to a set of output signals for loudspeakers, such that the spatial comfort noise signals are continually in the output signal sin addition to output from the received audio signals.

公开(公告)号：US20170127089A1

公开(公告)日：2017-05-04

申请号：US15277027

申请日：2016-09-27

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Dong Shi ,  Xuejing Sun ,  Glenn N. Dickins ,  David Gunawan

IPC: H04N19/86 ,  H04N19/42

CPC classification number: G10L19/0212 ,  H04N19/12 ,  H04N19/136 ,  H04N19/179

Abstract: A method of processing data comprises processing first frequency-domain audio or video data using signal processing of a first type, and transforming the processed first frequency-domain audio or video data to processed time-domain audio or video data using a transform which is the inverse of the first transform, and transforming the processed time-domain audio or video data using a second transform which is matched to a second type of signal processing. The method further comprises identifying time-domain audio or video data for which signal processing of the first type, after transformation using the second transform, would yield satisfactory results. The method further comprises transforming the identified time-domain audio or video data to frequency-domain identified audio or video data using the second transform, instead of using the first transform, and processing the identified frequency-domain audio or video data using signal processing of the first type.

公开(公告)号：US09602943B2

公开(公告)日：2017-03-21

申请号：US14384439

申请日：2013-03-21

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Huiqun Deng ,  Xuejing Sun

IPC: H04R5/00 ,  H04S1/00 ,  G10L21/0364 ,  H03G5/00 ,  G10L25/87

CPC classification number: H04S1/007 ,  G10L21/0364 ,  G10L25/87 ,  H04S2400/01 ,  H04S2400/05

Abstract: An audio processing method and apparatus are described. In one embodiment, at least one first sub-band of a first audio signal is suppressed to obtain a reduced first audio signal with reserved sub-bands; suppressing at least one second sub-band of the at least one second audio signal to obtain at least one reduced second audio signal with reserved sub-bands; and mixing the reduced first audio signal and at least one reduced second audio signal. Alternatively, a first spatial auditory property is assigned to a first audio signal so that the first audio signal may be perceived as originating from a first position. Alternatively, rhythmic similarity between at least two audio signals is detected, and time scaling is applied to an audio signal in response to relatively high rhythmic similarity between the audio signal and the other audio signal(s); and then at least two audio signals are mixed.

公开(公告)号：US09584087B2

公开(公告)日：2017-02-28

申请号：US14384372

申请日：2013-03-21

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Xuejing Sun ,  Glenn N. Dickins

IPC: H04B15/00 ,  H03G3/32 ,  G10L21/0316 ,  G10K11/16 ,  H04R27/00

CPC classification number: G10L21/0364 ,  G10K11/16 ,  G10L21/0224 ,  G10L21/0316 ,  G10L21/034 ,  G10L25/78 ,  H03G3/301 ,  H03G3/32

Abstract: A method, an apparatus, and logic to post-process raw gains determined by input processing to generate post-processed gains, comprising using one or both of delta gain smoothing and decision-directed gain smoothing. The delta gain smoothing comprises applying a smoothing filter to the raw gain with a smoothing factor that depends on the gain delta: the absolute value of the difference between the raw gain for the current frame and the post-processed gain for a previous frame. The decision-directed gain smoothing comprises converting the raw gain to a signal-to-noise ratio, applying a smoothing filter with a smoothing factor to the signal-to-noise ratio to calculate a smoothed signal-to-noise ratio, and converting the smoothed signal-to-noise ratio to determine the second smoothed gain, with smoothing factor possibly dependent on the gain delta.

Abstract translation: 一种用于后处理由输入处理确定的原始增益以产生后处理增益的方法，装置和逻辑，包括使用增量增益平滑和决策导向增益平滑中的一者或两者。 Δ增益平滑包括以平滑因子对原始增益应用平滑滤波器，该平滑因子取决于增益增量：当前帧的原始增益与前一帧的后处理增益之间的差的绝对值。 决策导向增益平滑包括将原始增益转换为信噪比，将具有平滑因子的平滑滤波器应用于信噪比以计算平滑的信噪比，并将 平滑的信噪比以确定第二平滑增益，平滑因子可能取决于增益增量。

公开(公告)号：US09552827B2

公开(公告)日：2017-01-24

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: H04B3/20 ,  G10L21/0208 ,  H04M9/08 ,  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）。

公开(公告)号：US09548063B2

公开(公告)日：2017-01-17

申请号：US14382864

申请日：2013-03-21

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Dong Shi ,  JiaQuan Huo ,  Xuejing Sun ,  Glenn N. Dickins

IPC: H04B3/20 ,  G10L21/0208 ,  G10L21/02 ,  G10L25/12

CPC classification number: G10L21/0208 ,  G10L21/02 ,  G10L25/12 ,  G10L2021/02082

Abstract: Embodiments of method and apparatus for acoustic echo control are described. According to the method, an echo energy-based doubletalk detection is performed to determine whether there is a doubletalk in a microphone signal with reference to a loudspeaker signal. A spectral similarity between spectra of the microphone signal and the loudspeaker signal is calculated. It is determined that there is no doubletalk in the microphone signal if the spectral similarity is higher than a threshold level. Adaption of an adaptive filter for applying acoustic echo cancellation or acoustic echo suppression on the microphone signal is enabled if it is determined that there is no doubletalk in the microphone signal through the echo energy-based doubletalk detection, or there is no doubletalk through the spectral similarity-based doubletalk detection.

Abstract translation: 描述了用于声学回声控制的方法和装置的实施例。 根据该方法，执行基于回波能量的双重检测，以确定麦克风信号中是否存在参考扬声器信号的双音节。 计算麦克风信号和扬声器信号的频谱之间的频谱相似度。 如果频谱相似度高于阈值电平，则确定麦克风信号中没有双音节。 如果通过基于回波能量的双重检测确定了麦克风信号中没有双重位，或者通过光谱没有双重反馈，则可以使用适用于对麦克风信号进行声学回声消除或声学回声抑制的自适应滤波器 基于相似度的双标检测。