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    Systems and methods for detection and cancellation of narrow-band noise
    21.
    发明授权
    Systems and methods for detection and cancellation of narrow-band noise 有权
    用于检测和消除窄带噪声的系统和方法

    公开(公告)号：US09264808B2

    公开(公告)日：2016-02-16

    申请号：US13917843

    申请日：2013-06-14

    Applicant: Cirrus Logic, Inc.

    Inventor： Dayong Zhou ,  Yang Lu

    IPC: G10K11/178 ,  H04R3/00

    CPC classification number: H04R3/005 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/503 ,  H04R2460/01 ,  H04R2499/11

    Abstract: In accordance with methods and systems of the present disclosure, an integrated circuit for implementing at least a portion of a personal audio device may include an output including an anti-noise signal, a reference microphone input, an error microphone input, and a processing circuit. The processing circuit may implement an adaptive filter having a response that generates the anti-noise signal from the reference microphone signal to reduce the presence of the ambient audio sounds heard by the listener, wherein the processing circuit may implement a coefficient control block that shapes the response of the adaptive filter in conformity with the error microphone signal and the reference microphone signal by adapting the response of the adaptive filter in accordance with a calculated narrow-band-to-full-band ratio, wherein the narrow-band-to-full-band ratio is a function of a narrow-band power of the reference microphone signal divided by a full-band power of the reference microphone signal.

    Abstract translation: 根据本公开的方法和系统，用于实现个人音频设备的至少一部分的集成电路可以包括包括抗噪声信号，参考麦克风输入，误差麦克风输入和处理电路的输出 。 处理电路可以实现具有从参考麦克风信号产生抗噪声信号的响应的自适应滤波器，以减少由收听者听到的环境音频声音的存在，其中处理电路可以实现一个系数控制块， 通过根据计算的窄带到全带比调整自适应滤波器的响应，自适应滤波器的响应与误差麦克风信号和参考麦克风信号一致，其中窄带到满 带比是参考麦克风信号的窄带功率除以参考麦克风信号的全频带功率的函数。

    Power management of adaptive noise cancellation (ANC) in a personal audio device
    22.
    发明授权
    Power management of adaptive noise cancellation (ANC) in a personal audio device 有权
    个人音频设备中自适应噪声消除（ANC）的电源管理

    公开(公告)号：US09230532B1

    公开(公告)日：2016-01-05

    申请号：US13794931

    申请日：2013-03-12

    Applicant: Cirrus Logic, Inc.

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

    IPC: A61F11/06 ,  G10K11/16 ,  H03B29/00 ,  G10K11/178

    CPC classification number: G10K11/178 ,  G10K11/16 ,  G10K2210/1081 ,  G10K2210/503 ,  H04R1/1083 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01 ,  H04R2499/11

    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 an output of a microphone that measures ambient audio. 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 microphone. A processing circuit estimates a level of background noise from the microphone output and sets a power conservation mode of the personal audio device in response to detecting that the background noise level is lower than a predetermined threshold.

    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麦克风的输出产生抗噪声信号。 抗噪声信号与源音频相结合，为扬声器提供输出。 抗噪声信号会导致麦克风出现的环境音频声音的消除。 响应于检测到背景噪声水平低于预定阈值，处理电路估计来自麦克风输出的背景噪声的水平并设置个人音频设备的功率节省模式。

    Ambient noise-based adaptation of secondary path adaptive response in noise-canceling personal audio devices
    23.
    发明授权
    Ambient noise-based adaptation of secondary path adaptive response in noise-canceling personal audio devices 有权
    噪声消除个人音频设备中二次路径自适应响应的基于噪声的环境适应

    公开(公告)号：US09208771B2

    公开(公告)日：2015-12-08

    申请号：US14062951

    申请日：2013-10-25

    Applicant: Cirrus Logic, Inc.

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

    IPC: G10K11/178

    CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3028

    Abstract: An adaptive noise canceller adapts a secondary path modeling response using ambient noise, rather than using another noise source or source audio as a training source. Anti-noise generated from a reference microphone signal using a first adaptive filter is used as the training signal for training the secondary path response. Ambient noise at the error microphone is removed from an error microphone signal, so that only anti-noise remains. A primary path modeling adaptive filter is used to modify the reference microphone signal to generate a source of ambient noise that is correlated with the ambient noise present at the error microphone, which is then subtracted from the error microphone signal to generate the error signal. The primary path modeling adaptive filter is previously adapted by minimizing components of the error microphone signal appearing in an output of the primary path adaptive filter while the anti-noise signal is muted.

    Abstract translation: 自适应噪声消除器使用环境噪声来适应次级路径建模响应，而不是使用另一噪声源或源音频作为训练源。 使用第一自适应滤波器从参考麦克风信号产生的抗噪声被用作用于训练辅助路径响应的训练信号。 错误麦克风处的环境噪声从误差麦克风信号中消除，从而仅保留抗噪声。 主路径建模自适应滤波器用于修改参考麦克风信号以产生与误差麦克风上存在的环境噪声相关的环境噪声源，然后将其从误差麦克风信号中减去以产生误差信号。 先前通过使主路径自适应滤波器的输出中出现的误差麦克风信号的分量最小化，同时抗噪声信号被静音，来先适应主路径建模自适应滤波器。

    FREQUENCY-SHAPED NOISE-BASED ADAPTATION OF SECONDARY PATH ADAPTIVE RESPONSE IN NOISE-CANCELING PERSONAL AUDIO DEVICES
    24.
    发明申请
    FREQUENCY-SHAPED NOISE-BASED ADAPTATION OF SECONDARY PATH ADAPTIVE RESPONSE IN NOISE-CANCELING PERSONAL AUDIO DEVICES 有权
    噪声消除个人音频设备中基于噪声的基于噪声的二次路自适应响应的适应

    公开(公告)号：US20150296296A1

    公开(公告)日：2015-10-15

    申请号：US14252235

    申请日：2014-04-14

    Applicant: Cirrus Logic, Inc.

    Inventor： Yang Lu ,  Dayong Zhou ,  Ning Li

    IPC: H04R3/00 ,  H04R1/08

    CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3049 ,  G10K2210/3056 ,  H04R1/08 ,  H04R1/1083 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01

    Abstract: A personal audio device 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 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 is injected so that the adaptation of the secondary path estimating adaptive filter can be maintained, irrespective of the presence and amplitude of the source audio. The noise is shaped by a noise shaping filter that has a response controlled in conformity with at least one parameter of the secondary path response.

    Abstract translation: 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环境音频声音的消除。 在扬声器附近还提供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。 噪声被注入，使得可以维持二次路径估计自适应滤波器的适应，而不管源音频的存在和幅度如何。 噪声通过噪声整形滤波器成形，该滤波器的响应受到与次要路径响应的至少一个参数相一致的控制。

    DOWNLINK TONE DETECTION AND ADAPTATION OF A SECONDARY PATH RESPONSE MODEL IN AN ADAPTIVE NOISE CANCELING SYSTEM
    25.
    发明申请
    DOWNLINK TONE DETECTION AND ADAPTATION OF A SECONDARY PATH RESPONSE MODEL IN AN ADAPTIVE NOISE CANCELING SYSTEM 有权
    自适应噪声消除系统中的二次路径响应模式的下行音调检测和适应

    公开(公告)号：US20130301848A1

    公开(公告)日：2013-11-14

    申请号：US13729141

    申请日：2012-12-28

    Applicant: CIRRUS LOGIC, INC.

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

    IPC: G10K11/16

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

    Abstract: 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.

    Abstract translation: 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了错误信号。 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。

    LOW-LATENCY MULTI-DRIVER ADAPTIVE NOISE CANCELING (ANC) SYSTEM FOR A PERSONAL AUDIO DEVICE
    29.
    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。

    Close talk detector for noise cancellation
    30.
    发明授权
    Close talk detector for noise cancellation 有权
    关闭通话检测器进行噪声消除

    公开(公告)号：US09094744B1

    公开(公告)日：2015-07-28

    申请号：US13724656

    申请日：2012-12-21

    Applicant: Cirrus Logic, Inc.

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

    IPC: H04R29/00 ,  H04R3/00

    CPC classification number: G10K11/178 ,  G10K11/16 ,  G10K2210/1081 ,  G10K2210/503 ,  H04R1/1083 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01 ,  H04R2499/11

    Abstract: A close talk detection method and system is provided for active noise cancellation system on a cellular telephone or the like, based on two properly located microphones. Given the location of the microphones and the way people use the phone, the power ratio (difference) at the two microphones implies the location of the speaker within a given range. The improved close-talk detector is not affected by power levels or SNR of non-close-talk ambient disturbances. Power levels of both a voice and a reference microphone are measured and the ratio r of these power levels is determined. If the ratio r is greater than a predetermined threshold (e.g., 7 dB), then close talk is occurring. If the ratio r is less than the predetermined threshold, then the signal is determined to be loud ambient noise or some other non-close-talking signal and noise cancellation processing is not affected.

    Abstract translation: 基于两个正确定位的麦克风，提供了一种用于蜂窝电话等上的主动噪声消除系统的紧密通话检测方法和系统。 鉴于麦克风的位置和人们使用手机的方式，两个麦克风的功率比（差异）意味着扬声器在给定范围内的位置。 改进的近距离检测器不受非紧密环境干扰的功率电平或SNR的影响。 测量语音和参考麦克风的功率电平，并确定这些功率电平的比率r。 如果比率r大于预定阈值（例如，7dB），则发生紧密通话。 如果比率r小于预定阈值，则确定该信号是大声的环境噪声，或者一些其它非关闭信号和噪声消除处理不受影响。

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