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    AN ADAPTIVE NOISE CANCELING ARCHITECTURE FOR A PERSONAL AUDIO DEVICE
    2.
    发明公开
    AN ADAPTIVE NOISE CANCELING ARCHITECTURE FOR A PERSONAL AUDIO DEVICE 审中-公开
    自适应降噪体结构的个人音频设备

    公开(公告)号：EP2715718A2

    公开(公告)日：2014-04-09

    申请号：EP12723554.7

    申请日：2012-04-30

    申请人： Cirrus Logic, Inc.

    发明人： HENDRIX, Jon, D. ,  KAMATH, Gautham, Devendra ,  KWATRA, Nitin ,  ABDOLLAHZADEH MILANI, Ali ,  ALDERSON, Jeffrey

    IPC分类号： G10K11/178

    CPC分类号： G10K11/178 ,  G10K11/17827 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/30232 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3051 ,  G10K2210/3055 ,  H04R1/1083 ,  H04R3/005

    摘要： An integrated circuit (20) for implementing at least a portion of a personal audio device is disclosed. The integrated circuit (20) comprises an audio source having an output providing source audio for playback to a listener. A combiner (26) combines the source audio and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of a transducer (SPKR), to generate an audio signal. A reference microphone input receives a reference microphone signal (ref) indicative of the ambient audio sounds and an error microphone input receives an error microphone signal (err) indicative of the acoustic output of the transducer (SPKR) and the ambient audio sounds at the transducer (SPKR). Further, a processing circuit (30) implements an adaptive filter having a response that generates the anti-noise signal from the reference microphone signal (ref) to reduce the presence of the ambient audio sounds heard by the listener. The processing circuit (30) implements a coefficient control block that shapes the response of the adaptive filter in conformity with the error microphone signal (err) and the reference microphone signal (ref) by adapting the response of the adaptive filter to minimize the ambient audio sounds at an error microphone. The processing circuit (30) is configured to detect whether the source audio is present at the output of the audio source, and in response to detecting that the source audio is present, to alter adaptation of the adaptive filter.

    EAR-COUPLING DETECTION AND ADJUSTMENT OF ADAPTIVE RESPONSE IN NOISE-CANCELING IN PERSONAL AUDIO DEVICES
    3.
    发明公开
    EAR-COUPLING DETECTION AND ADJUSTMENT OF ADAPTIVE RESPONSE IN NOISE-CANCELING IN PERSONAL AUDIO DEVICES 审中-公开
    耳朵和功率检测和适应性反应的个人音响器材降噪调整

    公开(公告)号：EP2715717A2

    公开(公告)日：2014-04-09

    申请号：EP12722573.8

    申请日：2012-04-30

    申请人： Cirrus Logic, Inc.

    发明人： ABDOLLAHZADEH MILANI, Ali ,  KAMATH, Gautham, Devendra

    IPC分类号： G10K11/178

    CPC分类号： G10K11/175 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/503

    摘要： A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit (30) that adaptively generates an anti-noise signal from a reference microphone signal (ref) and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit (30) through the transducer. A processing circuit (37, 38, K1, K2) determines a degree of coupling between the user's ear and the transducer and adjusts the adaptive cancellation of the ambient sounds to prevent erroneous and possibly disruptive generation of the anti-noise signal if the degree of coupling lies either below or above a range of normal operating ear contact pressure.

    DOWNLINK TONE DETECTION AND ADAPTION OF A SECONDARY PATH RESPONSE MODEL IN AN ADAPTIVE NOISE CANCELING SYSTEM
    5.
    发明公开
    DOWNLINK TONE DETECTION AND ADAPTION OF A SECONDARY PATH RESPONSE MODEL IN AN ADAPTIVE NOISE CANCELING SYSTEM 有权
    下拉链TONERKENNUNG UND ANPASSUNG EINESSEKUNDÄRPFAD-REAKTIONSMODELLS IN EINEM ADAPTIVENRAUSCHUNTERDRÜCKUNGSSYSTEM

    公开(公告)号：EP2847758A1

    公开(公告)日：2015-03-18

    申请号：EP13720701.5

    申请日：2013-04-24

    申请人： Cirrus Logic, Inc.

    发明人： ZHOU, Dayong ,  LU, Yang ,  HENDRIX, Jon, D. ,  ALDERSON, Jeffrey ,  MILLER, Antonio, John ,  YONG, Chin ,  KAMATH, Gautham, Devendra

    IPC分类号： G10K11/178

    CPC分类号： G10K11/175 ,  G10K11/16 ,  G10K11/178 ,  G10K2210/00 ,  G10K2210/108 ,  G10K2210/3011 ,  G10K2210/30231 ,  G10K2210/3028 ,  G10K2210/30351 ,  G10K2210/503

    摘要： An adaptive noise canceling (ANC) circuit adaptively generates an anti-noise signal from a reference microphone signal that is injected into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone proximate the speaker provides an error signal. A secondary path estimating adaptive filter estimates the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Tones in the source audio, such as remote ringtones, present in downlink audio during initiation of a telephone call, are detected by a tone detector using accumulated tone persistence and non-silence hangover counting, and adaptation of the secondary path estimating adaptive filter is halted to prevent adapting to the tones. Adaptation of the adaptive filters is then sequenced so any disruption of the secondary path adaptive filter response is removed before allowing the anti-noise generating filter to adapt.

    摘要翻译： 自适应噪声消除（ANC）电路自适应地从注入扬声器或其它换能器输出的参考麦克风信号产生抗噪声信号，以引起环境声音的消除。 靠近扬声器的错误麦克风提供错误信号。 二次路径估计自适应滤波器估计从噪声消除电路通过换能器的电声路径，从而可以从误差信号中去除源音频。 在开始电话呼叫期间存在于下行链路音频中的源音频中的音调（例如远程铃声）由使用累积的音调持续性和非静音宿醉计数的音调检测器检测，并且停止辅助路径估计自适应滤波器的适配 以防止适应色调。 然后对自适应滤波器的适应进行排序，因此在允许抗噪声产生滤波器适应之前，去除二次路径自适应滤波器响应的任何中断。