公开(公告)号：US09666176B2

公开(公告)日：2017-05-30

申请号：US14026021

申请日：2013-09-13

Applicant: Cirrus Logic, Inc.

Inventor： Ali Abdollahzadeh Milani ,  Yang Lu ,  Dayong Zhou ,  Ning Li

IPC: G10K11/178 ,  H03F1/02 ,  H03F3/181 ,  H03F3/52

CPC classification number: G10K11/1788 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/30232 ,  G10K2210/3045 ,  G10K2210/3049 ,  H03F1/0211 ,  H03F3/181 ,  H03F3/52

Abstract: A processing circuit may include: (i) an adaptive filter having a response that generates an anti-noise signal from a reference microphone signal, wherein the response is shaped in conformity with the reference microphone signal and a playback corrected error, and wherein the playback corrected error is based on a difference between an error microphone signal and a secondary path estimate; (ii) a secondary path estimate filter configured to model an electro-acoustic path of a source audio signal and having a response that generates a secondary path estimate from the source audio signal; (iii) a secondary coefficient control block that shapes the response of the secondary path estimate filter in conformity with the source audio signal and the playback corrected error by adapting the response of the secondary path estimate filter to minimize the playback corrected error; and (iv) a noise injection portion for injecting a noise signal into the source audio signal, wherein the noise signal is shaped based on the playback corrected error.

公开(公告)号：US09552805B2

公开(公告)日：2017-01-24

申请号：US14577519

申请日：2014-12-19

Applicant: Cirrus Logic, Inc.

Inventor： Yang Lu ,  Dayong Zhou ,  Antonio J. Miller ,  Ning Li

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/178 ,  G10K11/17833 ,  G10K11/17875 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3056 ,  G10K2210/503 ,  G10K2210/506 ,  H04R1/1083 ,  H04R2460/01

Abstract: A method for cancelling ambient audio sounds in the proximity of a transducer may include receiving an error microphone signal indicative of the output of the transducer and ambient audio sounds at the transducer. The method may also include generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer, wherein generating the anti-noise signal comprises applying a feedback filter having a response that generates a feedback anti-noise signal based on the error microphone signal and applying a variable gain element in series with the feedback filter. The method may further include monitoring whether an ambient audio event is occurring that could cause the feedback filter to generate an undesirable component in the anti-noise signal and controlling the gain of the variable gain element to reduce the undesirable component.

Abstract translation: 用于消除传感器附近的环境音频声音的方法可以包括接收指示换能器的输出的误差麦克风信号和换能器处的环境音频声音。 该方法还可以包括产生用于抵消在换能器的声输出处的环境音频声音的影响的抗噪声信号，其中产生抗噪声信号包括应用具有产生反馈抗噪声信号的响应的反馈滤波器 基于误差麦克风信号并与反馈滤波器串联地施加可变增益元件。 该方法还可以包括监视是否正在发生可能导致反馈滤波器在抗噪声信号中产生不期望的分量并且控制可变增益元件的增益以减少不期望的分量的环境音频事件。

公开(公告)号：US09319784B2

公开(公告)日：2016-04-19

申请号：US14252235

申请日：2014-04-14

Applicant: Cirrus Logic, Inc.

Inventor： Yang Lu ,  Dayong Zhou ,  Ning Li

IPC: A61F11/06 ,  H04R3/00 ,  H04R1/08 ,  G10K11/178 ,  H04R1/10

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。

公开(公告)号：US09294836B2

公开(公告)日：2016-03-22

申请号：US13952221

申请日：2013-07-26

Applicant: Cirrus Logic, Inc.

Inventor： Dayong Zhou ,  Yang Lu ,  Ning Li

IPC: G10K11/16 ,  H04R3/00 ,  G10K11/178

CPC classification number: H04R3/002 ,  G10K11/16 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17833 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3017 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3035 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/3056 ,  G10K2210/503 ,  G10K2210/509

Abstract: In accordance with methods and systems of the present disclosure, a processing circuit may implement at least one of: a feedback filter having a response that generates at least a portion of an anti-noise component from a playback corrected error, the playback corrected error based on a difference between the error microphone signal and a secondary path estimate; and a feedforward filter having a response that generates at least a portion of the anti-noise signal from a reference microphone signal. The processing circuit may also implement a secondary path estimate filter configured to model an electro-acoustic path of a source audio signal and have a response that generates a secondary path estimate from the source audio signal and a secondary path estimate performance monitor for monitoring performance of the secondary path estimate filter in modeling the electro-acoustic path.

Abstract translation: 根据本公开的方法和系统，处理电路可以实现以下至少一个：具有响应的反馈滤波器，该响应从回放校正误差产生抗噪声分量的至少一部分，基于回放校正误差 在误差麦克风信号和次路径估计之间的差异; 以及前馈滤波器，其具有从参考麦克风信号产生抗噪声信号的至少一部分的响应。 处理电路还可以实现二次路径估计滤波器，其被配置为对源音频信号的电声路径进行建模，并且具有从源音频信号生成次路径估计的响应，以及用于监视源音频信号的次级路径估计性能监视器 二次路径估计滤波器对电声路径进行建模。

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。

公开(公告)号：US09106989B2

公开(公告)日：2015-08-11

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: H03B29/00 ,  H04R3/00 ,  G10K11/178

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。

公开(公告)号：US09066176B2

公开(公告)日：2015-06-23

申请号：US13950854

申请日：2013-07-25

Applicant: Cirrus Logic, Inc.

Inventor： Jon D. Hendrix ,  Ning Li ,  Jeffrey D. Alderson

IPC: H04R5/033 ,  G10K11/178 ,  H04R1/10

CPC classification number: H04R5/033 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3048 ,  G10K2210/3049 ,  H04R1/1083 ,  H04R2410/05

Abstract: In accordance with method and systems of the present disclosure, a 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, 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 to minimize the ambient audio sounds in the error microphone signal, and a coefficient bias control block which biases coefficients of the coefficient control block towards zero in a range of frequencies outside of a frequency response of the source audio signal.

Abstract translation: 根据本公开的方法和系统，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，以减少听众听到的环境音频声音的存在，系数 控制块，其通过调整自适应滤波器的响应来最小化误差麦克风信号中的环境音频声音，使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，以及偏差的系数偏置控制块 系数控制块的系数在源音频信号的频率响应之外的频率范围内朝向零。

公开(公告)号：US20140307899A1

公开(公告)日：2014-10-16

申请号：US13950854

申请日：2013-07-25

Applicant: Cirrus Logic, Inc.

Inventor： Jon D. Hendrix ,  Ning Li ,  Jeffrey D. Alderson

IPC: G10K11/16 ,  H04R5/033

CPC classification number: H04R5/033 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3048 ,  G10K2210/3049 ,  H04R1/1083 ,  H04R2410/05

Abstract: In accordance with method and systems of the present disclosure, a 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, 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 to minimize the ambient audio sounds in the error microphone signal, and a coefficient bias control block which biases coefficients of the coefficient control block towards zero in a range of frequencies outside of a frequency response of the source audio signal.

Abstract translation: 根据本公开的方法和系统，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，以减少听众听到的环境音频声音的存在，系数 控制块，其通过调整自适应滤波器的响应来最小化误差麦克风信号中的环境音频声音，使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，以及偏差的系数偏置控制块 系数控制块的系数在源音频信号的频率响应之外的频率范围内朝向零。

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。

公开(公告)号：US20160180830A1

公开(公告)日：2016-06-23

申请号：US14577519

申请日：2014-12-19

Applicant: Cirrus Logic, Inc.

Inventor： Yang Lu ,  Dayong Zhou ,  Antonio J. Miller ,  Ning Li

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/178 ,  G10K11/17833 ,  G10K11/17875 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3056 ,  G10K2210/503 ,  G10K2210/506 ,  H04R1/1083 ,  H04R2460/01

Abstract: A method for cancelling ambient audio sounds in the proximity of a transducer may include receiving an error microphone signal indicative of the output of the transducer and ambient audio sounds at the transducer. The method may also include generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer, wherein generating the anti-noise signal comprises applying a feedback filter having a response that generates a feedback anti-noise signal based on the error microphone signal and applying a variable gain element in series with the feedback filter. The method may further include monitoring whether an ambient audio event is occurring that could cause the feedback filter to generate an undesirable component in the anti-noise signal and controlling the gain of the variable gain element to reduce the undesirable component.

Abstract translation: 用于消除传感器附近的环境音频声音的方法可以包括接收指示换能器的输出的误差麦克风信号和换能器处的环境音频声音。 该方法还可以包括产生用于抵消在换能器的声输出处的环境音频声音的影响的抗噪声信号，其中产生抗噪声信号包括应用具有产生反馈抗噪声信号的响应的反馈滤波器 基于误差麦克风信号并与反馈滤波器串联地施加可变增益元件。 该方法还可以包括监视是否正在发生可能导致反馈滤波器在抗噪声信号中产生不期望的分量并且控制可变增益元件的增益以减少不期望的分量的环境音频事件。