公开(公告)号：US20150269926A1

公开(公告)日：2015-09-24

申请号：US14734321

申请日：2015-06-09

Applicant: Cirrus Logic, Inc.

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

IPC: G10K11/178

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. A level of the source audio with respect to the ambient audio is 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。 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。

公开(公告)号：US20140270224A1

公开(公告)日：2014-09-18

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：US20130301846A1

公开(公告)日：2013-11-14

申请号：US13784018

申请日：2013-03-04

Applicant: CIRRUS LOGIC, INC.

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

IPC: H04R3/00

CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3012 ,  G10K2210/30231 ,  G10K2210/3025 ,  G10K2210/3028 ,  G10K2210/30391 ,  G10K2210/3226 ,  G10K2210/503 ,  H04R1/1083 ,  H04R3/00

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 detects frequency-dependent characteristics in and/or direction of the ambient sounds and alters adaptation of the noise canceling circuit in response to the detection.

Abstract translation: 诸如无线电话的个人音频设备包括噪声消除电路，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到扬声器或其它换能器输出中以引起环境音频声音的消除。 还可以在扬声器附近提供误差麦克风以测量换能器的输出，以便控制抗噪声信号的适应性并且估计通过换能器的噪声消除电路的电声路径。 执行自适应噪声消除（ANC）功能的处理电路还检测环境声音和/或方向上的频率相关特性，并且响应于检测改变噪声消除电路的适应。

公开(公告)号：US10468048B2

公开(公告)日：2019-11-05

申请号：US14578567

申请日：2014-12-22

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra ,  Jeffrey Alderson ,  Jon D. Hendrix

IPC: G10L21/0208 ,  G10K11/175 ,  G10K11/178 ,  H04M1/20

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 estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether one of the reference or error microphones is obstructed by comparing their received signal content and takes action to avoid generation of erroneous anti-noise.

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.

公开(公告)号：US09773490B2

公开(公告)日：2017-09-26

申请号：US14734321

申请日：2015-06-09

Applicant: Cirrus Logic, Inc.

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

IPC: 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. A level of the source audio with respect to the ambient audio is determined to determine whether the system may generate erroneous anti-noise and/or become unstable.

公开(公告)号：US09532139B1

公开(公告)日：2016-12-27

申请号：US13721832

申请日：2012-12-20

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 frequency domain method and system for online self-calibrating microphone frequency amplitude response based on noise floor (minima) tracking are disclosed. A cellular telephone or other system with dual microphones may self-calibrate itself on-the-fly. The system selects one of the microphones as a reference and calibrates the frequency response of the two microphones using the first microphone as a reference, so that they have a matched frequency amplitude response. To achieve this on-the-fly calibration, the system uses background noise for calibration purposes. The signal power spectra of the noise minima at the two microphones is used to calibrate the respective microphone frequency response. The system may then adapt the frequency amplitude responses of the two microphones so that the power spectral density from each microphone matches the other, and the system is then calibrated. This calibration could occur any time the device is receiving a noise minima and could be done continuously as the device is being used.

Abstract translation: 公开了一种基于噪声本底（最小值）跟踪的在线自校准麦克风频率振幅响应的频域方法和系统。 具有双麦克风的蜂窝电话或其他系统可以自动校准自身。 该系统选择一个麦克风作为参考，并使用第一麦克风作为参考来校准两个麦克风的频率响应，使得它们具有匹配的频率幅度响应。 为了实现这个动态校准，系统使用背景噪声进行校准。 两个麦克风的噪声最小值的信号功率谱用于校准相应的麦克风频率响应。 然后，系统可以适应两个麦克风的频率振幅响应，使得来自每个麦克风的功率谱密度与另一个相匹配，然后校准系统。 该校准可能在设备接收噪声最小值时发生，并且可以在使用设备时连续进行。

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。

公开(公告)号：US20150104032A1

公开(公告)日：2015-04-16

申请号：US14578567

申请日：2014-12-22

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra ,  Jeffrey Alderson ,  Jon D. Hendrix

IPC: G10L21/0208 ,  G10K11/175 ,  H04M1/20

CPC classification number: G10L21/0208 ,  G10K11/175 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/30231 ,  G10K2210/30391 ,  G10K2210/503 ,  H04M1/20

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 estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether one of the reference or error microphones is obstructed by comparing their received signal content and takes action to avoid generation of erroneous anti-noise.

Abstract translation: 诸如无线电话的个人音频设备包括噪声消除电路，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到扬声器或其它换能器输出中以引起环境音频声音的消除。 还可以在扬声器附近提供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。 处理电路使用参考和/或误差麦克风，可选地与提供用于捕获近端语音的麦克风一起，通过比较其接收的信号内容来确定参考或误差麦克风中的一个是否被阻挡，并采取行动以避免产生 错误的抗噪声。

公开(公告)号：US20130287219A1

公开(公告)日：2013-10-31

申请号：US13795160

申请日：2013-03-12

Applicant: CIRRUS LOGIC, INC.

Inventor： Jon D. Hendrix ,  Jeffrey Alderson

IPC: G10K11/175

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 an event requiring action on the adaptation of one of the adaptive filters is detected, action is taken on the other one of the adaptive filters. Another feature of the ANC system uses microphone signals provided at both of the earspeakers to perform processing on a voice microphone signal that receives speech of the user.

Abstract translation: 包括耳式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，使得当检测到需要对自适应滤波器之一的自适应的动作的事件时，对另一个自适应滤波器采取动作。 ANC系统的另一个特征是使用在两个耳机中提供的麦克风信号对接收用户语音的语音麦克风信号进行处理。