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    SOURCE AUDIO ACOUSTIC LEAKAGE DETECTION AND MANAGEMENT IN AN ADAPTIVE NOISE CANCELING SYSTEM
    1.
    发明申请
    SOURCE AUDIO ACOUSTIC LEAKAGE DETECTION AND MANAGEMENT IN AN ADAPTIVE NOISE CANCELING SYSTEM 有权
    自适应噪声消除系统中的源音频声音泄漏检测与管理

    公开(公告)号：US20150269926A1

    公开(公告)日：2015-09-24

    申请号：US14734321

    申请日：2015-06-09

    Applicant: Cirrus Logic, Inc.

    Inventor： Jeffrey Alderson ,  Jon D. Hendrix ,  Dayong Zhou ,  Antonio John Miller ,  Chin Yong ,  Gautham Devendra Kamath

    IPC: G10K11/178

    CPC classification number: G10K11/178 ,  G10K11/16 ,  G10K2210/00 ,  G10K2210/108 ,  G10K2210/3014 ,  G10K2210/3017 ,  G10K2210/3028 ,  G10K2210/30391 ,  G10L2021/02165 ,  H04B3/237

    Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal 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 to the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. A level of the source audio with respect to the ambient audio is determined to determine whether the system may generate erroneous anti-noise and/or become unstable.

    Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以引起取消 的环境音频声音。 还提供了靠近扬声器的误差麦克风以提供指示噪声消除的有效性的误差信号。 二次路径估计自适应滤波器用于估计通过换能器的噪声消除电路的电声路径，从而可以从误差信号中去除源音频。 确定相对于环境音频的源音频的电平以确定系统是否可能产生错误的抗噪声和/或变得不稳定。

    Robust adaptive noise canceling (ANC) in a personal audio device
    3.
    发明授权
    Robust adaptive noise canceling (ANC) in a personal audio device 有权
    个人音频设备中的鲁棒自适应噪声消除（ANC）

    公开(公告)号：US09502020B1

    公开(公告)日：2016-11-22

    申请号：US14210589

    申请日：2014-03-14

    Applicant: Cirrus Logic, Inc.

    Inventor： Ali Abdollahzadeh Milani ,  Jeffrey Alderson ,  Gautham Devendra Kamath ,  Yang Lu

    IPC: H04R29/00 ,  H03G3/00 ,  G10K11/16

    CPC classification number: G10K11/16 ,  G10K11/178 ,  G10K11/17835 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3028 ,  G10K2210/3045 ,  G10K2210/3054

    Abstract: An adaptive noise canceling (ANC) circuit adaptively generates an anti-noise signal that is injected into the speaker or other transducer output to cause cancellation of ambient audio sounds. At least one microphone provides an error signal indicative of the noise cancellation at the transducer, and the adaptive filter is adapted to minimize the error signal. In order to prevent improper adaptation or instabilities in one or both of the adaptive filters, spikes are detected in the error signal by comparing the error signal or its rate of change to a threshold. Therefore, if the magnitude of the coefficient error is greater than a threshold value for an update, the update is skipped. Alternatively the step size of the updates may be reduced. Similar criteria can be applied to a filter modeling the secondary path, based on detection applied to both the source audio and the error signal.

    Abstract translation: 自适应噪声消除（ANC）电路自适应地产生被注入到扬声器或其他换能器输出中的抗噪声信号，以引起环境声音的消除。 至少一个麦克风提供指示换能器处的噪声消除的误差信号，并且自适应滤波器适于使误差信号最小化。 为了防止一个或两个自适应滤波器中的不适当的适应或不稳定性，通过将误差信号或其变化率与阈值相比较，在误差信号中检测尖峰。 因此，如果系数误差的大小大于更新的阈值，则跳过更新。 或者，可以减少更新的步长。 基于对源音频和误差信号两者的检测，可以将类似的标准应用于建模辅助路径的滤波器。

    ADAPTIVE NOISE CANCELING ARCHITECTURE FOR A PERSONAL AUDIO DEVICE
    5.
    发明申请
    ADAPTIVE NOISE CANCELING ARCHITECTURE FOR A PERSONAL AUDIO DEVICE 有权
    适应噪音取消个人音乐设备的架构

    公开(公告)号：US20160232887A1

    公开(公告)日：2016-08-11

    申请号：US15130271

    申请日：2016-04-15

    Applicant: Cirrus Logic, Inc.

    Inventor： Jon D. Hendrix ,  Gautham Devendra Kamath ,  Nitin Kwatra ,  Ali Abdollahzadeh Milani ,  Jeffrey Alderson

    IPC: G10K11/178

    CPC classification number: 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

    Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal that measures the ambient audio and an error microphone signal that measures the output of an output transducer plus any ambient audio at that location and injects the anti-noise signal at the transducer output to cause cancellation of ambient audio sounds. A processing circuit uses the reference and error microphone to generate the anti-noise signal, which can be generated by an adaptive filter operating at a multiple of the ANC coefficient update rate. Downlink audio can be combined with the high data rate anti-noise signal by interpolation. High-pass filters in the control paths reduce DC offset in the ANC circuits, and ANC coefficient adaptation can be halted when downlink audio is not detected.

    Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从测量环境音频的参考麦克风信号产生抗噪声信号，以及测量输出的输出的误差麦克风信号 传感器加上该位置的任何环境音频，并在传感器输出端注入抗噪声信号，以引起环境音频声音的消除。 处理电路使用参考误差麦克风来产生抗噪声信号，该噪声信号可以由以ANC系数更新率的倍数操作的自适应滤波器生成。 下行音频可以通过插值与高数据速率的抗噪声信号组合。 控制路径中的高通滤波器减少了ANC电路中的DC偏移，并且当未检测到下行链路音频时，可以停止ANC系数适配。

    EAR-COUPLING DETECTION AND ADJUSTMENT OF ADAPTIVE RESPONSE IN NOISE-CANCELING IN PERSONAL AUDIO DEVICES
    6.
    发明申请
    EAR-COUPLING DETECTION AND ADJUSTMENT OF ADAPTIVE RESPONSE IN NOISE-CANCELING IN PERSONAL AUDIO DEVICES 有权
    在个人音响设备中的噪声消除中的自适应检测和自适应响应的调整

    公开(公告)号：US20150092953A1

    公开(公告)日：2015-04-02

    申请号：US14564611

    申请日：2014-12-09

    Applicant: Cirrus Logic, Inc.

    Inventor： Ali Abdollahzadeh Milani ,  Gautham Devendra Kamath

    IPC: G10K11/175

    CPC classification number: G10K11/175 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/503

    Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal 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 through the transducer. A processing circuit 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.

    Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以引起取消 的环境音频声音。 在扬声器附近还设置误差麦克风，以估计从噪声消除电路通过换能器的电声路径。 处理电路确定用户的耳朵和换能器之间的耦合程度，并调整环境声音的自适应消除，以防止如果耦合度低于或高于一个范围的抗噪声信号的错误和可能的破坏性产生 正常操作耳朵接触压力。

    Robust adaptive noise canceling (ANC) in a personal audio device
    9.
    发明授权
    Robust adaptive noise canceling (ANC) in a personal audio device 有权
    个人音频设备中的鲁棒自适应噪声消除（ANC）

    公开(公告)号：US09324311B1

    公开(公告)日：2016-04-26

    申请号：US14210537

    申请日：2014-03-14

    Applicant: Cirrus Logic, Inc.

    Inventor： Ali Abdollahzadeh Milani ,  Jeffrey Alderson ,  Gautham Devendra Kamath ,  Yang Lu

    IPC: H03B29/00 ,  G10K11/16

    CPC classification number: G10K11/16 ,  G10K11/178 ,  G10K11/17835 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3028 ,  G10K2210/3045 ,  G10K2210/3054

    Abstract: An adaptive noise canceling (ANC) circuit adaptively generates an anti-noise signal from that is injected into the speaker or other transducer output to cause cancellation of ambient audio sounds. At least one microphone provides an error signal indicative of the noise cancellation at the transducer, and the coefficients of the adaptive filter are adapted to minimize the error signal. In order to prevent improper adaptation or instabilities in one or both of the adaptive filters, spikes are detected in the error signal by comparing the error signal to a threshold ambient noise average. Therefore, if the magnitude of the coefficient error is greater than a threshold value for an update, the update is skipped. Alternatively the step size of the updates may be reduced.

    Abstract translation: 自适应噪声消除（ANC）电路自适应地产生从其被注入扬声器或其它换能器输出中的抗噪声信号，以引起环境声音的消除。 至少一个麦克风提供指示换能器处的噪声消除的误差信号，并且自适应滤波器的系数适于使误差信号最小化。 为了防止一个或两个自适应滤波器中的不适当的适应或不稳定性，通过将误差信号与阈值环境噪声平均值进行比较，在误差信号中检测到峰值。 因此，如果系数误差的大小大于更新的阈值，则跳过更新。 或者，可以减少更新的步长。

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