公开(公告)号：US09633646B2

公开(公告)日：2017-04-25

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: G10K11/16 ,  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.

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。

公开(公告)号：US20160232887A1

公开(公告)日：2016-08-11

申请号：US15130271

申请日：2016-04-15

Applicant: Cirrus Logic, Inc.

Inventor： Jon D. Hendrix ,  Gautham Devendra Kamath ,  Nitin Kwatra ,  Ali Abdollahzadeh Milani ,  Jeffrey Alderson

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K11/17827 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/30232 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3051 ,  G10K2210/3055 ,  H04R1/1083 ,  H04R3/005

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 that measures the ambient audio and an error microphone signal that measures the output of an output transducer plus any ambient audio at that location and injects the anti-noise signal at the transducer output to cause cancellation of ambient audio sounds. A processing circuit uses the reference and error microphone to generate the anti-noise signal, which can be generated by an adaptive filter operating at a multiple of the ANC coefficient update rate. Downlink audio can be combined with the high data rate anti-noise signal by interpolation. High-pass filters in the control paths reduce DC offset in the ANC circuits, and ANC coefficient adaptation can be halted when downlink audio is not detected.

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参考麦克风信号产生抗噪声信号，以及测量输出的输出的误差麦克风信号 传感器加上该位置的任何环境音频，并在传感器输出端注入抗噪声信号，以引起环境音频声音的消除。 处理电路使用参考误差麦克风来产生抗噪声信号，该噪声信号可以由以ANC系数更新率的倍数操作的自适应滤波器生成。 下行音频可以通过插值与高数据速率的抗噪声信号组合。 控制路径中的高通滤波器减少了ANC电路中的DC偏移，并且当未检测到下行链路音频时，可以停止ANC系数适配。

公开(公告)号：US09319781B2

公开(公告)日：2016-04-19

申请号：US13784018

申请日：2013-03-04

Applicant: Cirrus Logic, Inc.

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

IPC: G10K11/16 ,  H04R3/00 ,  G10K11/178 ,  H04R1/10

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：US09226068B2

公开(公告)日：2015-12-29

申请号：US14656124

申请日：2015-03-12

Applicant: Cirrus Logic, Inc.

Inventor： Jon D. Hendrix ,  Jeffrey Alderson

IPC: A61F11/06 ,  G10K11/16 ,  H03B29/00 ,  H04R1/10 ,  H04R29/00 ,  H04R3/00 ,  G10K11/175 ,  G10K11/178

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: 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。

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。

公开(公告)号：US09082387B2

公开(公告)日：2015-07-14

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: G10K11/16 ,  G10K11/00 ,  G10K11/178

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。

公开(公告)号：US09014387B2

公开(公告)日：2015-04-21

申请号：US13795160

申请日：2013-03-12

Applicant: Cirrus Logic, Inc.

Inventor： Jon D. Hendrix ,  Jeffrey Alderson

IPC: A61F11/06 ,  G10K11/16 ,  H03B29/00 ,  H04R1/10 ,  H04R29/00 ,  G10K11/175 ,  G10K11/178

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。

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：US20130301849A1

公开(公告)日：2013-11-14

申请号：US13787906

申请日：2013-03-07

Applicant: CIRRUS LOGIC, INC.

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

IPC: G10K11/16

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。