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    Robust adaptive noise canceling (ANC) in a personal audio device
    13.
    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。

    Leakage-modeling adaptive noise canceling for earspeakers
    14.
    发明授权
    Leakage-modeling adaptive noise canceling for earspeakers 有权
    用于耳机的泄漏建模自适应噪声消除

    公开(公告)号：US09142205B2

    公开(公告)日：2015-09-22

    申请号：US13692367

    申请日：2012-12-03

    Applicant: Cirrus Logic, Inc.

    Inventor： Jeffrey Alderson ,  Jon D. Hendrix

    IPC: G10K11/00 ,  G10K11/178

    CPC classification number: G10K11/002 ,  G10K11/17819 ,  G10K11/17833 ,  G10K2210/1081 ,  G10K2210/505 ,  G10K2210/506

    Abstract: A personal audio device, such as a headphone, 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 the anti-noise signal is combined with source audio to provide an output for a speaker. The anti-noise signal causes cancellation of ambient audio sounds that appear at the reference microphone. A processing circuit uses the reference microphone to generate the anti-noise signal, which can be generated by an adaptive filter. The processing circuit also models an acoustic leakage path from the transducer to the reference microphone and removes elements of the source audio appearing at the reference microphone signal due to the acoustic output of the speaker. Another adaptive filter can be used to model the acoustic leakage path.

    Abstract translation: 诸如耳机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，并将抗噪声信号与源音频组合 为扬声器提供输出。 抗噪声信号会导致出现在参考麦克风处的环境音频声音的消除。 处理电路使用参考麦克风来产生可由自适应滤波器产生的抗噪声信号。 处理电路还对从换能器到参考麦克风的声音泄漏路径建模，并且由于扬声器的声输出而去除出现在参考麦克风信号处的源音频的元素。 另一种自适应滤波器可用于对声学泄漏路径建模。

    Error-signal content controlled adaptation of secondary and leakage path models in noise-canceling personal audio devices
    15.
    发明授权
    Error-signal content controlled adaptation of secondary and leakage path models in noise-canceling personal audio devices 有权
    噪声消除个人音频设备中的次要和泄漏路径模型的错误信号内容控制适应

    公开(公告)号：US09076427B2

    公开(公告)日：2015-07-07

    申请号：US13787906

    申请日：2013-03-07

    Applicant: Cirrus Logic, Inc.

    Inventor： Jeffrey Alderson ,  Jon D. Hendrix ,  Yang Lu

    IPC: A61F11/06 ,  G10K11/16 ,  G10K11/178

    CPC classification number: G10K11/16 ,  G10K11/17819 ,  G10K11/17833 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/3023 ,  G10K2210/3055 ,  G10K2210/503 ,  G10K2210/505 ,  G10K2210/506

    Abstract: A personal audio device, such as a wireless telephone, generates an anti-noise signal from a microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. The microphone measures the ambient environment, but also contains a component due to the transducer acoustic output. An adaptive filter is used to estimate the electro-acoustical path from the noise-canceling circuit through the transducer to the at least one microphone so that source audio can be removed from the microphone signal. A determination of the relative amount of the ambient sounds present in the microphone signal versus the amount of the transducer output of the source audio present in the microphone signal is made to determine whether to update the adaptive response.

    Abstract translation: 诸如无线电话的个人音频设备从麦克风信号产生抗噪声信号，并将抗噪声信号注入到扬声器或其他换能器输出中以引起环境声音的消除。 麦克风测量周围环境，但由于传感器的声音输出，也包含一个组件。 自适应滤波器用于估计从噪声消除电路通过换能器到至少一个麦克风的电声路径，从而可以从麦克风信号中去除源音频。 确定麦克风信号中存在的环境声音的相对量与麦克风信号中存在的源音频的换能器输出的量的确定以确定是否更新自适应响应。

    COORDINATED GAIN CONTROL IN ADAPTIVE NOISE CANCELLATION (ANC) FOR EARSPEAKERS
    16.
    发明申请
    COORDINATED GAIN CONTROL IN ADAPTIVE NOISE CANCELLATION (ANC) FOR EARSPEAKERS 审中-公开
    自适应噪声消除（ANC）中的协调增益控制

    公开(公告)号：US20150189434A1

    公开(公告)日：2015-07-02

    申请号：US14656124

    申请日：2015-03-12

    Applicant: Cirrus Logic, Inc.

    Inventor： Jon D. Hendrix ,  Jeffrey Alderson

    IPC: H04R3/00

    CPC classification number: H04R3/002 ,  G10K11/175 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/30391 ,  G10K2210/3055 ,  G10K2210/503

    Abstract: A personal audio device including earspeakers, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal for each earspeaker from at least one microphone signal that measures the ambient audio, and the anti-noise signals are combined with source audio to provide outputs for the earspeakers. The anti-noise signals cause cancellation of ambient audio sounds at the respective earspeakers. A processing circuit uses the microphone signal(s) to generate the anti-noise signals, which can be generated by adaptive filters. The processing circuit controls adaptation of the adaptive filters such that when the processing circuit detects that either of the earspeakers are off-ear, a gain applied to the anti-noise signals is reduced.

    Abstract translation: 一种包括耳朵扬声器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至少一个麦克风信号为每个耳塞产生抗噪声信号，并且抗噪声信号与源音频 为耳机提供输出。 抗噪声信号会引起相应耳机扬声器环境声音的消除。 处理电路使用麦克风信号来产生可由自适应滤波器产生的抗噪声信号。 处理电路控制自适应滤波器的自适应，使得当处理电路检测到任一个耳机是脱耳机时，降低了对抗噪声信号的增益。

    LOW-LATENCY MULTI-DRIVER ADAPTIVE NOISE CANCELING (ANC) SYSTEM FOR A PERSONAL AUDIO DEVICE
    17.
    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：US20140270222A1

    公开(公告)日：2014-09-18

    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: H04R3/00

    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生成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。

    NOISE BURST ADAPTATION OF SECONDARY PATH ADAPTIVE RESPONSE IN NOISE-CANCELING PERSONAL AUDIO DEVICES
    18.
    发明申请
    NOISE BURST ADAPTATION OF SECONDARY PATH ADAPTIVE RESPONSE IN NOISE-CANCELING PERSONAL AUDIO DEVICES 有权
    噪音消除个人音乐设备中二次路自适应响应的噪声调整

    公开(公告)号：US20130301842A1

    公开(公告)日：2013-11-14

    申请号：US13722119

    申请日：2012-12-20

    Applicant: CIRRUS LOGIC, INC.

    Inventor： Jon D. Hendrix ,  Jeffrey Alderson ,  Antonio John Miller ,  Yang Lu

    IPC: G10K11/00

    CPC classification number: G10K11/002 ,  G10K11/178 ,  G10K11/17817 ,  G10K2210/108 ,  G10K2210/3049

    Abstract: A personal audio device, such as a wireless telephone, generates an anti-noise signal from an error microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. The error microphone is also provided proximate 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. Noise bursts are injected intermittently and the adaptation of the secondary path estimating adaptive filter controlled, so that the secondary path estimate can be maintained irrespective of the presence and amplitude of the source audio.

    Abstract translation: 诸如无线电话的个人音频设备从误差麦克风信号产生抗噪声信号，并将抗噪声信号注入到扬声器或其它换能器输出中以引起环境声音的消除。 误差麦克风也靠近扬声器提供，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。 噪声突发被间歇地注入，并且二次路径估计自适应滤波器的适配被控制，使得可以维持辅助路径估计，而不管源音频的存在和幅度如何。

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