公开(公告)号：US20200380945A1

公开(公告)日：2020-12-03

申请号：US16871661

申请日：2020-05-11

Applicant: Apple Inc.

Inventor： John Woodruff ,  Tom-Davy W. Saux ,  Vladan Bajic ,  Vasu Iyengar ,  Andrew E. Greenwood ,  Tyrone T. Chen ,  Jakub Mazur ,  Tony S. Verma

IPC: G10K11/178

Abstract: An audio system has an ambient sound enhancement function, in which an against-the-ear audio device having a speaker converts a digitally processed version of an input audio signal into sound. The audio system also has an acoustic noise cancellation (ANC) function that may be combined in various ways with the sound enhancement function, and that may be responsive to voice activity detection. Other aspects are also described and claimed.

公开(公告)号：US10269369B2

公开(公告)日：2019-04-23

申请号：US15610500

申请日：2017-05-31

Applicant: Apple Inc.

Inventor： Nicholas J. Bryan ,  Vasu Iyengar

IPC: H04R3/00 ,  G10L25/84 ,  G10L21/028 ,  G10L21/0208 ,  G10L21/0216 ,  G10L21/0232 ,  G10L21/0272

Abstract: System of noise reduction for mobile devices includes blind source separator (BSS) and noise suppressor. BSS receives signals from at least two audio pickup channels. BSS includes sound source separator, voice source detector, equalizer, and auto-disabler. Sound source separator generates signals representing first sound source and second sound source based on signals from the first and the second channels. Voice source detector determines whether the signals representing the first and second sound sources are voice signal or noise signal, respectively. Equalizer scales noise signal to match a level of the voice signal, and generates scaled noise signal. Auto-disabler determines whether to disable BSS. Auto-disabler outputs signals from the at least two audio pickup channels when the BSS is disabled and outputs the voice signal and the scaled noise signal when the BSS is not disabled. Noise suppressor generates clean signal based on outputs from auto-disabler. Other embodiments are also described.

公开(公告)号：US20180350381A1

公开(公告)日：2018-12-06

申请号：US15610500

申请日：2017-05-31

Applicant: Apple Inc.

Inventor： Nicholas J. Bryan ,  Vasu Iyengar

IPC: G10L21/0232 ,  G10L25/84 ,  G10L21/028 ,  H04R3/00 ,  G10L21/0272

CPC classification number: G10L21/0232 ,  G10L21/0272 ,  G10L21/028 ,  G10L25/84 ,  G10L2021/02082 ,  G10L2021/02166 ,  H04R3/005

Abstract: System of noise reduction for mobile devices includes blind source separator (BSS) and noise suppressor. BSS receives signals from at least two audio pickup channels. BSS includes sound source separator, voice source detector, equalizer, and auto-disabler. Sound source separator generates signals representing first sound source and second sound source based on signals from the first and the second channels. Voice source detector determines whether the signals representing the first and second sound sources are voice signal or noise signal, respectively. Equalizer scales noise signal to match a level of the voice signal, and generates scaled noise signal. Auto-disabler determines whether to disable BSS. Auto-disabler outputs signals from the at least two audio pickup channels when the BSS is disabled and outputs the voice signal and the scaled noise signal when the BSS is not disabled. Noise suppressor generates clean signal based on outputs from auto-disabler. Other embodiments are also described.

公开(公告)号：US09966067B2

公开(公告)日：2018-05-08

申请号：US13911915

申请日：2013-06-06

Applicant: Apple Inc.

Inventor： Vasu Iyengar ,  Sorin V. Dusan

IPC: G10L21/00 ,  G10L15/20 ,  G10L21/0232 ,  G10L21/0224 ,  G10L25/78 ,  G10L21/0216

CPC classification number: G10L15/20 ,  G10L21/0224 ,  G10L21/0232 ,  G10L2021/02165 ,  G10L2025/783

Abstract: Digital signal processing techniques for automatically reducing audible noise from a sound recording that contains speech. A noise suppression system uses two types of noise estimators, including a more aggressive one and less aggressive one. Decisions are made on how to select or combine their outputs into a usable noise estimate in a different speech and noise conditions. A 2-channel noise estimator is described. Other embodiments are also described and claimed.

公开(公告)号：US20180033447A1

公开(公告)日：2018-02-01

申请号：US15225707

申请日：2016-08-01

Applicant: Apple Inc.

Inventor： Sean A. Ramprashad ,  Esge B. Andersen ,  Joshua D. Atkins ,  Sorin V. Dusan ,  Vasu Iyengar ,  Tarun Pruthi ,  Lalin S. Theverapperuma

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

Abstract: An audio system has a housing in which are integrated a number of microphones. A programmed processor accesses the microphone signals and produces a number of acoustic pick up beams based groups of microphones, an estimation of voice activity and an estimation of noise characteristics on each beam. Two or more beams including a voice beam that is used to pick up a desired voice and a noise beam that is used to provide information to estimate ambient noise are adaptively selected from among the plurality of beams, based on thresholds for voice separation and thresholds for noise-matching. Other embodiments are also described and claimed.

公开(公告)号：US09524735B2

公开(公告)日：2016-12-20

申请号：US14170136

申请日：2014-01-31

Applicant: Apple Inc.

Inventor： Vasu Iyengar ,  Aram M. Lindahl

IPC: G10L25/84 ,  G10L25/78 ,  G10L21/0216

CPC classification number: G10L25/84 ,  G10L2021/02165 ,  G10L2025/786

Abstract: A method for adapting a threshold used in multi-channel audio voice activity detection. Strengths of primary and secondary sound pick up channels are computed. A separation, being a measure of difference between the strengths of the primary and secondary channels, is also computed. An analysis of the peaks in separation is performed, e.g. using a leaky peak capture function that captures a peak in the separation and then decays over time, or using a sliding window min-max detector. A threshold that is to be used in a voice activity detection (VAD) process is adjusted, in accordance with the analysis of the peaks. Other embodiments are also described and claimed.

Abstract translation: 一种用于调整在多声道音频语音活动检测中使用的阈值的方法。 计算一次和二次声音拾取通道的强度。 还计算出分离，作为主要和次要信道强度差异的量度。 进行分离峰的分析，例如 使用泄漏峰值捕获功能，捕获分离中的峰值，然后随时间衰减，或使用滑动窗口最小 - 最大检测器。 根据峰值的分析，调整在语音活动检测（VAD）过程中使用的阈值。 还描述和要求保护其他实施例。

公开(公告)号：US09467779B2

公开(公告)日：2016-10-11

申请号：US14276988

申请日：2014-05-13

Applicant: Apple Inc.

Inventor： Vasu Iyengar ,  Fatos Myftari ,  Sorin V. Dusan ,  Aram M. Lindahl

IPC: H04R3/04 ,  H04R3/00 ,  H04R1/08

CPC classification number: H04R3/04 ,  H04R1/08 ,  H04R3/002 ,  H04R3/005 ,  H04R2499/11

Abstract: Digital signal processing for microphone partial occlusion detection is described. In one embodiment, an electronic system for audio noise processing and for noise reduction, using a plurality of microphones, includes a first noise estimator to process a first audio signal from a first one of the microphones, and generate a first noise estimate. The electronic system also includes a second noise estimator to process the first audio signal, and a second audio signal from a second one of the microphones, in parallel with the first noise estimator, and generate a second noise estimate. A microphone partial occlusion detector determines a low frequency band separation of the first and second audio signals and a high frequency band separation of the first and second audio signals to generate a microphone partial occlusion function that indicates whether one of the microphones is partially occluded.

Abstract translation: 描述了用于麦克风部分遮挡检测的数字信号处理。 在一个实施例中，使用多个麦克风的用于音频噪声处理和降噪的电子系统包括第一噪声估计器，用于处理来自第一麦克风的第一音频信号，并产生第一噪声估计。 电子系统还包括第二噪声估计器，用于处理第一音频信号，以及来自第二麦克风的第二音频信号与第一噪声估计器并行并产生第二噪声估计。 麦克风部分遮挡检测器确定第一和第二音频信号的低频带分离以及第一和第二音频信号的高频带间隔，以产生指示麦克风中的一个是否被部分遮挡的麦克风部分闭塞功能。

公开(公告)号：US20150325251A1

公开(公告)日：2015-11-12

申请号：US14274544

申请日：2014-05-09

Applicant: Apple Inc.

Inventor： Sorin V. Dusan ,  Aram M. Lindahl ,  Alexander Kanaris ,  Vasu Iyengar

IPC: G10L21/0208

CPC classification number: G10L21/0216 ,  G10L21/0208 ,  G10L2021/02166

Abstract: Electronic system for audio noise processing and noise reduction comprises: first and second noise estimators, selector and attenuator. First noise estimator processes first audio signal from voice beamformer (VB) and generate first noise estimate. VB generates first audio signal by beamforming audio signals from first and second audio pick-up channels. Second noise estimator processes first and second audio signal from noise beamformer (NB), in parallel with first noise estimator and generates second noise estimate. NB generates second audio signal by beamforming audio signals from first and second audio pick-up channels. First and second audio signals include frequencies in first and second frequency regions. Selector's output noise estimate may be a) second noise estimate in the first frequency region, and b) first noise estimate in the second frequency region. Attenuator attenuates first audio signal in accordance with output noise estimate. Other embodiments are also described.

Abstract translation: 用于音频噪声处理和降噪的电子系统包括：第一和第二噪声估计器，选择器和衰减器。 第一噪声估计器处理来自语音波束形成器（VB）的第一音频信号并产生第一噪声估计。 VB通过来自第一和第二音频拾取通道的波束成形音频信号产生第一音频信号。 第二噪声估计器与第一噪声估计器并行地处理来自噪声波束形成器（NB）的第一和第二音频信号，并产生第二噪声估计。 NB通过波束成形来自第一和第二音频拾取通道的音频信号产生第二音频信号。 第一和第二音频信号包括第一和第二频率区域中的频率。 选择器的输出噪声估计可以是a）第一频率区域中的第二噪声估计，以及b）第二频率区域中的第一噪声估计。 衰减器根据输出噪声估计衰减第一音频信号。 还描述了其它实施例。