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    LOW-LATENCY MULTI-DRIVER ADAPTIVE NOISE CANCELING (ANC) SYSTEM FOR A PERSONAL AUDIO DEVICE
    3.
    发明申请
    LOW-LATENCY MULTI-DRIVER ADAPTIVE NOISE CANCELING (ANC) SYSTEM FOR A PERSONAL AUDIO DEVICE 有权
    用于个人音频设备的低延迟多媒体自适应噪声消除（ANC）系统

    公开(公告)号：US20160316291A1

    公开(公告)日：2016-10-27

    申请号：US15202644

    申请日：2016-07-06

    Applicant: CIRRUS LOGIC, INC.

    Inventor： Jon D. Hendrix ,  Jeffrey Alderson ,  Ali Abdollahzadeh Milani ,  Dayong Zhou ,  Yang Lu

    IPC: H04R1/10 ,  H04R3/12 ,  G10K11/178

    CPC classification number: H04R1/1083 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3019 ,  G10K2210/3028 ,  H04R1/24 ,  H04R3/005 ,  H04R3/12 ,  H04R2410/05 ,  H04R2460/01

    Abstract: A personal audio device including multiple output transducers for reproducing different frequency bands of a source audio signal, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal for each of the transducers from at least one microphone signal that measures the ambient audio to generate anti-noise signals. The anti-noise signals are generated by separate adaptive filters such that the anti-noise signals cause substantial cancelation of the ambient audio at their corresponding transducers. The use of separate adaptive filters provides low-latency operation, since a crossover is not needed to split the anti-noise into the appropriate frequency bands. The adaptive filters can be implemented or biased to generate anti-noise only in the frequency band corresponding to the particular adaptive filter. The anti-noise signals are combined with source audio of the appropriate frequency band to provide outputs for the corresponding transducers.

    Abstract translation: 包括用于再现源音频信号的不同频带的多个输出换能器的个人音频设备包括自适应噪声消除（ANC）电路，该自适应噪声消除（ANC）电路从至少一个麦克风信号自适应地产生每个换能器的抗噪声信号，该麦克风信号测量 环境音频产生抗噪声信号。 抗噪声信号由单独的自适应滤波器产生，使得抗噪声信号在其相应的换能器处引起环境音频的实质消除。 使用单独的自适应滤波器提供低等待时间操作，因为不需要交叉来将抗噪声分解成适当的频带。 可以实现或偏置自适应滤波器以仅在对应于特定自适应滤波器的频带中产生抗噪声。 抗噪声信号与适当频带的源音频组合，为相应的换能器提供输出。

    ADAPTIVE NOISE CANCELING ARCHITECTURE FOR A PERSONAL AUDIO DEVICE
    4.
    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
    5.
    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。

    ADAPTIVE-NOISE CANCELING (ANC) EFFECTIVENESS ESTIMATION AND CORRECTION IN A PERSONAL AUDIO DEVICE
    6.
    发明申请
    ADAPTIVE-NOISE CANCELING (ANC) EFFECTIVENESS ESTIMATION AND CORRECTION IN A PERSONAL AUDIO DEVICE 有权
    自适应噪声消除（ANC）个人音频设备的有效性估计和校正

    公开(公告)号：US20140270223A1

    公开(公告)日：2014-09-18

    申请号：US14029159

    申请日：2013-09-17

    Applicant: Cirrus Logic, Inc.

    Inventor： Ning Li ,  Antonio John Miller ,  Jon D. Hendrix ,  Jie Su ,  Jeffrey Alderson ,  Ali Abdollahzadeh Milani

    IPC: H04R3/00

    CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3026 ,  G10K2210/3028 ,  H04R1/1083 ,  H04R2460/01

    Abstract: Techniques for estimating adaptive noise canceling (ANC) performance in a personal audio device, such as a wireless telephone, provide robustness of operation by triggering corrective action when ANC performance is low, and/or by saving a state of the ANC system when ANC performance is high. An anti-noise signal is generated from a reference microphone signal and is provided to an output transducer along with program audio. A measure of ANC gain is determined by computing a ratio of a first indication of magnitude of an error microphone signal that provides a measure of the ambient sounds and program audio heard by the listener including the effects of the anti-noise, to a second indication of magnitude of the error microphone signal without the effects of the anti-noise. The ratio can be determined for different frequency bands in order to determine whether particular adaptive filters are trained properly.

    Abstract translation: 用于估计诸如无线电话的个人音频设备中的自适应噪声消除（ANC）性能的技术通过在ANC性能低时通过触发纠正动作来提供鲁棒性，和/或通过在ANC性能时保存ANC系统的状态 高。 从参考麦克风信号产生抗噪声信号，并将其与节目音频一起提供给输出变换器。 ANC增益的量度通过计算提供环境声音的度量的误差麦克风信号的幅度的第一指示和包括抗噪声的影响的收听者听到的节目音频的第一指示与第二指示 的误差麦克风信号的幅度没有抗噪声的影响。 可以针对不同的频带来确定该比率，以便确定特定的自适应滤波器是否被适当地训练。

    Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC)
    7.
    发明授权
    Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC) 有权

    公开(公告)号：US10249284B2

    公开(公告)日：2019-04-02

    申请号：US15786701

    申请日：2017-10-18

    Applicant: Cirrus Logic, Inc.

    Inventor： Nitin Kwatra ,  Ali Abdollahzadeh Milani ,  Jeffrey Alderson

    IPC: G10K11/178 ,  H04R1/10 ,  G10L21/0208 ,  G10L21/0364

    Abstract: A personal audio device, such as a wireless telephone, includes noise canceling 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 provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. The anti-noise signal is adaptively generated to minimize the ambient audio sounds at the error microphone. A processing circuit that performs the adaptive noise canceling (ANC) function also filters one or both of the reference and/or error microphone signals, to bias the adaptation of the adaptive filter in one or more frequency regions to alter a degree of the minimization of the ambient audio sounds at the error microphone.

    Robust adaptive noise canceling (ANC) in a personal audio device
    8.
    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。

    Low-latency multi-driver adaptive noise canceling (ANC) system for a personal audio device
    10.
    发明授权
    Low-latency multi-driver adaptive noise canceling (ANC) system for a personal audio device 有权
    用于个人音频设备的低延迟多驱动器自适应噪声消除（ANC）系统

    公开(公告)号：US09414150B2

    公开(公告)日：2016-08-09

    申请号：US13968007

    申请日：2013-08-15

    Applicant: Cirrus Logic, Inc.

    Inventor： Jon D. Hendrix ,  Jeffrey Alderson ,  Ali Abdollahzadeh Milani ,  Dayong Zhou ,  Yang Lu

    IPC: G10K11/16 ,  H04R1/24 ,  G10K11/178 ,  H04R3/12 ,  H04R3/00 ,  H04H40/72 ,  H04R1/10

    CPC classification number: H04R1/1083 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3019 ,  G10K2210/3028 ,  H04R1/24 ,  H04R3/005 ,  H04R3/12 ,  H04R2410/05 ,  H04R2460/01

    Abstract: A personal audio device including multiple output transducers for reproducing different frequency bands of a source audio signal, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal for each of the transducers from at least one microphone signal that measures the ambient audio to generate anti-noise signals. The anti-noise signals are generated by separate adaptive filters such that the anti-noise signals cause substantial cancellation of the ambient audio at their corresponding transducers. The use of separate adaptive filters provides low-latency operation, since a crossover is not needed to split the anti-noise into the appropriate frequency bands. The adaptive filters can be implemented or biased to generate anti-noise only in the frequency band corresponding to the particular adaptive filter. The anti-noise signals are combined with source audio of the appropriate frequency band to provide outputs for the corresponding transducers.

    Abstract translation: 包括用于再现源音频信号的不同频带的多个输出换能器的个人音频设备包括自适应噪声消除（ANC）电路，该自适应噪声消除（ANC）电路从至少一个麦克风信号自适应地产生每个换能器的抗噪声信号，该麦克风信号测量 环境音频产生抗噪声信号。 抗噪声信号由单独的自适应滤波器产生，使得抗噪声信号在其相应的换能器处引起环境音频的实质消除。 使用单独的自适应滤波器提供低等待时间操作，因为不需要交叉来将抗噪声分解成适当的频带。 可以实现或偏置自适应滤波器以仅在对应于特定自适应滤波器的频带中产生抗噪声。 抗噪声信号与适当频带的源音频组合，为相应的换能器提供输出。

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