公开(公告)号：US09516413B1

公开(公告)日：2016-12-06

申请号：US14503175

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Vasu Iyengar ,  Aram M. Lindahl

IPC: H04R3/02 ,  H04W4/02

CPC classification number: H04W4/02 ,  H04R2227/007 ,  H04S7/301 ,  H04S7/305

Abstract: Systems and methods are described for storing and reusing previously generated/calculated acoustic environment data. By reusing acoustic environment data, the systems and methods described herein may avoid the increased overhead in generating/calculating acoustic environment data for a location when this data has already been generated and is likely accurate. In particular, the time and complexity involved in determining reverberation/echo levels, noise levels, and noise types may be avoided when this information is available in storage. This previously stored acoustic environment data may not be limited to data generated/calculated by the same audio device. Instead, in some embodiments an audio device may access a centralized repository to leverage acoustic environment data generated/calculated by other audio devices.

Abstract translation: 描述了用于存储和重新使用先前生成/计算的声学环境数据的系统和方法。 通过重新使用声学环境数据，本文所描述的系统和方法可以避免在该数据已经被生成并且可能是准确的情况下在产生/计算位置的声学环境数据时增加的开销。 特别地，当该信息在存储器中可用时，可以避免确定混响/回波电平，噪声电平和噪声类型所涉及的时间和复杂性。 该先前存储的声学环境数据可以不限于由相同的音频设备产生/计算的数据。 相反，在一些实施例中，音频设备可以访问中央存储库以利用由其他音频设备生成/计算的声学环境数据。

公开(公告)号：US20150221322A1

公开(公告)日：2015-08-06

申请号：US14170136

申请日：2014-01-31

Applicant: Apple Inc.

Inventor： Vasu Iyengar ,  Aram M. LindahI

IPC: G10L25/84 ,  G10L21/0208

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：US11935512B2

公开(公告)日：2024-03-19

申请号：US17746930

申请日：2022-05-17

Applicant: Apple Inc.

Inventor： Yang Lu ,  Andrew P. Bright ,  Fatos Myftari ,  Vasu Iyengar

IPC: G10K11/178

CPC classification number: G10K11/17853

Abstract: Aspects of the subject technology provide for generation of a self-voice signal by an electronic device that is operating in an active noise cancellation mode. In this way, during a phone call, a video conference, or while listening to audio content, a user of the electronic device may benefit from active cancellation of ambient noise while still being able to hear their own voice when they speak. In various implementations described herein, the concurrent self-voice and automatic noise cancellation features are facilitated by accelerometer-based control of sidetone and/or active noise cancellation operations.

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。