公开(公告)号：US20140270222A1

公开(公告)日：2014-09-18

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: H04R3/00

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生成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：US20130301842A1

公开(公告)日：2013-11-14

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: G10K11/00

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：US09773493B1

公开(公告)日：2017-09-26

申请号：US14949212

申请日：2015-11-23

Applicant: Cirrus Logic, Inc.

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

IPC: G10K11/178 ,  H04R1/10

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.

公开(公告)号：US09721556B2

公开(公告)日：2017-08-01

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: G10K11/16 ,  H03B29/00 ,  G10K11/175 ,  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.

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：US20150256660A1

公开(公告)日：2015-09-10

申请号：US14197814

申请日：2014-03-05

Applicant: Cirrus Logic, Inc.

Inventor： Roy Scott Kaller ,  Jon D. Hendrix

IPC: H04M1/58

CPC classification number: H04M1/58 ,  G10L21/0364 ,  G10L2021/02082 ,  H04M1/585 ,  H04M9/08

Abstract: A personal audio device includes a sidetone circuit with one or more adjustable coefficients that generates a sidetone signal from the output of a first microphone. The sidetone circuit has one or more adjustable coefficients for altering the relationship between the first microphone signal and the sidetone signal. The personal audio device also includes a transducer for reproducing playback audio and the sidetone signal at an ear of a listener and a second microphone for measuring the output of the transducer as delivered to the ear of the listener. The sidetone circuit includes a calibration circuit for estimating a response of the second microphone to the sidetone signal and adjusting the coefficient of the sidetone circuit according to the estimated response.

Abstract translation: 个人音频设备包括具有一个或多个可调节系数的侧音电路，其从第一麦克风的输出产生侧音信号。 侧音电路具有用于改变第一麦克风信号和侧音信号之间的关系的一个或多个可调系数。 个人音频设备还包括用于再现回放音频的换能器和在收听者的耳朵处的侧音信号，以及用于测量传递到收听者的耳朵的换能器的输出的第二麦克风。 侧音电路包括校准电路，用于估计第二麦克风对侧音信号的响应，并且根据估计的响应调整侧音电路的系数。