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    Mitigating noise in audio signals
    2.
    发明授权
    Mitigating noise in audio signals 有权

    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.

    Echo cancellation and control for microphone beam patterns
    6.
    发明授权
    Echo cancellation and control for microphone beam patterns 有权
    麦克风波束模式的回波消除和控制

    公开(公告)号：US09516409B1

    公开(公告)日：2016-12-06

    申请号：US14714023

    申请日：2015-05-15

    Applicant: Apple Inc.

    Inventor： Sean A. Ramprashad ,  Martin E. Johnson ,  Vasu Iyengar ,  Ronald N. Isaac

    IPC: H04B3/20 ,  H04R3/00 ,  H04R1/08 ,  H04B3/23

    CPC classification number: H04B3/23 ,  H04R1/403 ,  H04R1/406 ,  H04R3/02 ,  H04R2430/23

    Abstract: Systems and methods for controlling echo in audio communications between a near-end system and a far-end system are described. The system and method may intelligently assign a plurality of microphone beams to a limited number of echo cancellers for processing. The microphone beams may be classified based on generated statistics to determine beams of interest (e.g., beams with a high ratio of local-voice to echo). Based on this ranking/classification of microphone beams, beams of greater interest may be assigned to echo cancellers while less important beams may temporally remain unprocessed until these beams become of higher importance/interest. Accordingly, a limited number of echo cancellers may be used to intelligently process a larger number of microphone beams based on interest in the beams and properties of echo cancellation performed for each beam.

    Abstract translation: 描述了用于控制近端系统和远端系统之间的音频通信中回波的系统和方法。 该系统和方法可智能地将多个麦克风束分配给有限数量的回波消除器进行处理。 麦克风束可以基于生成的统计来分类，以确定感兴趣的波束（例如，具有高比例的本地话音到回波的波束）。 基于麦克风束的这种排序/分类，可以将更感兴趣的波束分配给回波消除器，而不太重要的波束可以暂时保持未处理，直到这些波束变得更高的重要性/兴趣。 因此，有限数量的回波消除器可以用于基于对光束的兴趣和针对每个光束执行的回波消除的特性来智能处理更大数量的麦克风束。

    System and method of double talk detection with acoustic echo and noise control
    7.
    发明授权
    System and method of double talk detection with acoustic echo and noise control 有权
    双声道检测与声学回声和噪声控制的系统和方法

    公开(公告)号：US09516159B2

    公开(公告)日：2016-12-06

    申请号：US14880824

    申请日：2015-10-12

    Applicant: Apple Inc.

    Inventor： Lalin S. Theverapperuma ,  Vasu Iyengar ,  Sean A. Ramprashad

    IPC: H04B1/38 ,  H04M3/00 ,  G10L21/0208 ,  G10L21/02 ,  H04M1/60 ,  H04L5/14 ,  H04M9/08 ,  G10L21/0264 ,  G10L21/0216

    CPC classification number: H04M3/002 ,  G10L21/0205 ,  G10L21/0208 ,  G10L21/0264 ,  G10L2021/02082 ,  G10L2021/02161 ,  G10L2021/02165 ,  H04L5/14 ,  H04M1/60 ,  H04M1/6041 ,  H04M9/082

    Abstract: System of improving sound quality includes loudspeaker, microphone, accelerometer, acoustic-echo-cancellers (AEC), and double-talk detector (DTD). Loudspeaker outputs loudspeaker signal including downlink audio signal from far-end speaker. Microphone generates microphone uplink signal and receives at least one of: near-end speaker, ambient noise, and loudspeaker signals. Accelerometer generates accelerometer-uplink signal and receives at least one of: near-end speaker, ambient noise, and loudspeaker signals. First AEC receives downlink audio, microphone-uplink and double talk control signals, and generates AEC-microphone linear echo estimate and corrected AEC-microphone uplink signal. Second AEC receives downlink audio, accelerometer uplink and double talk control signals, and generates AEC-accelerometer linear echo estimate and corrected AEC-accelerometer uplink signal. DTD receives downlink audio signal, uplink signals, corrected uplink signals, linear echo estimates, and generates double-talk control signal. Uplink audio signal including at least one of corrected microphone-uplink signal and corrected accelerometer-uplink signal is generated. Other embodiments are described.

    Abstract translation: 提高音质的系统包括扬声器，麦克风，加速度计，声回波消除器（AEC）和双通话检测器（DTD）。 扬声器输出包括来自远端扬声器的下行音频信号的扬声器信号。 麦克风产生麦克风上行链路信号，并接收以下至少一个：近端扬声器，环境噪声和扬声器信号。 加速度计产生加速度计 - 上行链路信号并接收以下至少一种：近端扬声器，环境噪声和扬声器信号。 第一AEC接收下行音频，麦克风上行和双通话控制信号，并生成AEC麦克风线性回波估计和校正的AEC麦克风上行信号。 第二个AEC接收下行音频，加速度计上行链路和双通道控制信号，并生成AEC加速度计线性回波估计和校正的AEC加速度计上行信号。 DTD接收下行链路音频信号，上行链路信号，校正的上行链路信号，线性回波估计，并产生双向对话控制信号。 产生包括校正的麦克风 - 上行链路信号和校正的加速度计 - 上行链路信号中的至少一个的上行链路音频信号。 描述其他实施例。

    Method and system for detecting and mitigating audio howl in headsets
    8.
    发明授权
    Method and system for detecting and mitigating audio howl in headsets 有权

    公开(公告)号：US11250833B1

    公开(公告)日：2022-02-15

    申请号：US17023278

    申请日：2020-09-16

    Applicant: Apple Inc.

    Inventor： Vladan Bajic ,  Hanchi Chen ,  Vasu Iyengar ,  Yang Lu ,  Navneet Gandhi ,  Thomas M. Jensen

    IPC: G10K11/178 ,  H04R1/10

    Abstract: A method performed by an audio system that includes a headset with a left headset housing and a right headset housing. The method includes driving a speaker of the left headset housing with an audio signal, determining whether audio howl is present within the left headset housing by comparing spectral content from a first error microphone signal produced by a first error microphone of the left headset housing and spectral content from a second error microphone signal produced by a second error microphone of the right headset housing, and, in response to determining that audio howl is present, filtering the audio signal to mitigate the audio howl.

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