公开(公告)号：US20180040315A1

公开(公告)日：2018-02-08

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

CPC classification number: G10K11/178 ,  G10K2210/108 ,  G10K2210/3012 ,  G10K2210/3017 ,  G10K2210/30231 ,  G10K2210/3028 ,  G10K2210/30391 ,  G10K2210/3226 ,  G10K2210/507 ,  G10K2210/508 ,  G10K2210/511 ,  G10K2210/512 ,  G10L21/0208 ,  G10L21/0364 ,  H04R1/1083

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.

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。

公开(公告)号：US20160196816A1

公开(公告)日：2016-07-07

申请号：US15070564

申请日：2016-03-15

Applicant: Cirrus Logic, Inc.

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

IPC: G10K11/175

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.

公开(公告)号：US09369798B1

公开(公告)日：2016-06-14

申请号：US13794979

申请日：2013-03-12

Applicant: Cirrus Logic, Inc.

Inventor： Jeffrey Alderson ,  Jon D. Hendrix ,  Gautham Devendra Kamath

IPC: A61F11/06 ,  G10K11/16 ,  H03B29/00 ,  H04B15/00 ,  H04R3/00

CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3051 ,  H04R1/1083 ,  H04R2410/05 ,  H04R2460/01

Abstract: A personal audio device, such as a headphone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal using one or more microphone signals that measure the 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 in the microphone signals. A processing circuit uses the reference microphone to generate the anti-noise signal using one or more adaptive filters. The processing circuit also includes low-pass filters that remove quantization noise images at the output of the adaptive filter to reduce the dynamic range required at the output of the adaptive filter.

Abstract translation: 诸如耳机的个人音频设备包括使用测量环境音频的一个或多个麦克风信号自适应地生成抗噪声信号的自适应噪声消除（ANC）电路。 抗噪声信号与源音频相结合，为扬声器提供输出。 抗噪声信号会导致消除麦克风信号中出现的环境音频声音。 处理电路使用参考麦克风使用一个或多个自适应滤波器产生抗噪声信号。 处理电路还包括低通滤波器，其在自适应滤波器的输出处去除量化噪声图像，以减少在自适应滤波器的输出处所需的动态范围。

公开(公告)号：US09368099B2

公开(公告)日：2016-06-14

申请号：US14228322

申请日：2014-03-28

Applicant: Cirrus Logic, Inc.

Inventor： Jeffrey Alderson ,  Nitin Kwatra ,  Gautham Devendra Kamath ,  Ali Abdollahzadeh Milani ,  John L. Melanson

IPC: G10K11/16 ,  G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/1082 ,  G10K2210/3017 ,  G10K2210/3028 ,  G10K2210/3035 ,  G10K2210/3049 ,  G10K2210/3056 ,  G10K2210/511

Abstract: A personal audio device, such as a wireless telephone, includes noise canceling 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 may also be 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. A processing circuit that performs the adaptive noise canceling (ANC) function also either adjusts the frequency response of the anti-noise signal with respect to the reference microphone signal, and/or by adjusting the response of the adaptive filter independent of the adaptation provided by the reference microphone signal.

公开(公告)号：US09318090B2

公开(公告)日：2016-04-19

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 ,  H03B29/00 ,  G10K11/178

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。

公开(公告)号：US20160063988A1

公开(公告)日：2016-03-03

申请号：US14840831

申请日：2015-08-31

Applicant: Cirrus Logic, Inc.

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

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/1784 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/3045 ,  G10K2210/3216 ,  G10K2210/3226 ,  G10K2210/504 ,  H04R1/1083 ,  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 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 measure the ambient sounds and transducer output near the transducer, thus providing an indication of the effectiveness of the noise canceling. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether the ANC circuit is incorrectly adapting or may incorrectly adapt to the instant acoustic environment and/or whether the anti-noise signal may be incorrect and/or disruptive and then take action in the processing circuit to prevent or remedy such conditions.

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。 在扬声器附近还提供误差麦克风以测量传感器附近的环境声音和换能器输出，从而提供噪声消除的有效性的指示。 处理电路使用参考和/或误差麦克风，可选地连同提供用于捕获近端语音的麦克风，以确定ANC电路是否不正确地适配或可能不正确地适应于即时声学环境和/ 噪声信号可能不正确和/或破坏，然后在处理电路中采取行动，以防止或补救这些条件。

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。

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。

公开(公告)号：US09123321B2

公开(公告)日：2015-09-01

申请号：US13727718

申请日：2012-12-27

Applicant: Cirrus Logic, Inc.

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

IPC: G01K11/16 ,  G10K11/16 ,  G10K11/178 ,  H04B3/23 ,  G10L21/0216

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. Adaptation of adaptive filters is sequenced so that update of their coefficients does not cause instability or error in the update. A level of the source audio with respect to the ambient audio can be 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。 对自适应滤波器的适应进行排序，以便更新其系数不会导致更新中的不稳定或错误。 可以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。