公开(公告)号：WO2012075343A2

公开(公告)日：2012-06-07

申请号：PCT/US2011062968

申请日：2011-12-01

Applicant: CIRRUS LOGIC INC

Inventor： HENDRIX JOH D ,  MILANI ABDOLLAHZADEH ,  KWATRA NITIN ,  ZHOU DAYONG ,  LU YANG ,  ALDERSON JEFFREY

IPC: G10K11/178

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，以防止或补救这种情况。

公开(公告)号：WO2012166320A3

公开(公告)日：2013-06-06

申请号：PCT/US2012037449

申请日：2012-05-11

Applicant: CIRRUS LOGIC INC

Inventor： KWATRA NITIN ,  HENDRIX JON D

IPC: G10K11/178

CPC classification number: G10K11/1788 ,  G10K11/17833 ,  G10K2210/3017 ,  G10K2210/3037 ,  G10K2210/3039 ,  G10K2210/3045 ,  G10K2210/3213 ,  G10K2210/503

Abstract: A personal audio device, such as a wireless telephone, includes noise canceling circuit (30) that adaptively generates an anti-noise signal from a reference microphone signal (ref) and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. A processing circuit (60) monitors a level of the anti-noise signal, determines that the anti-noise signal may cause damage to the transducer and adjusts the generation of the anti-noise signal such that damage to the transducer is prevented.

Abstract translation: 诸如无线电话的个人音频设备包括从参考麦克风信号（ref）自适应地生成抗噪声信号的噪声消除电路（30），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 取消环境音频声音。 处理电路（60）监视抗噪声信号的电平，确定抗噪声信号可能导致对换能器的损坏并调整抗噪声信号的产生，从而防止对换能器的损坏。

公开(公告)号：WO2012166511A3

公开(公告)日：2013-06-06

申请号：PCT/US2012039336

申请日：2012-05-24

Applicant: CIRRUS LOGIC INC

Inventor： KWATRA NITIN

IPC: G10K11/178

CPC classification number: G10K11/1784 ,  G10K11/17817 ,  G10K2210/108 ,  G10K2210/3049

Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling circuit (30) that adaptively generates an anti-noise signal from a reference microphone signal (ref) and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone (err) 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 (SE, SE copy) is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio (ds) can be removed from the error signal. Noise (37) is injected either continuously and inaudibly below the source audio, or in response to detection that the source audio is low in amplitude, so that the adaptation of the secondary path estimating adaptive filter 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包括自适应噪声消除电路（30），其自适应地从参考麦克风信号（ref）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 导致环境音频声音的取消。 在扬声器附近还提供错误麦克风（err）以提供指示噪声消除的有效性的错误信号。 使用二次路径估计自适应滤波器（SE，SE拷贝）来估计通过换能器的噪声消除电路的电声路径，从而能够从误差信号中去除源音频（ds）。 噪声（37）被连续地和无声地地注入到源音频之下，或者响应于源音频的振幅低的响应，从而可以维持二次路径估计自适应滤波器的适应性，而不管存在和幅度如何 的源音频。

公开(公告)号：WO2012166386A3

公开(公告)日：2013-05-16

申请号：PCT/US2012038510

申请日：2012-05-18

Applicant: CIRRUS LOGIC INC

Inventor： KWATRA NITIN ,  ALDERSON JEFFREY ,  HENDRIX JON D

IPC: G10K11/178

CPC classification number: G10L21/0208 ,  G10K11/175 ,  G10K11/178 ,  G10K11/1784 ,  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声音的消除。 也可以在扬声器附近设置误差麦克风，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：WO2015134225A4

公开(公告)日：2015-10-29

申请号：PCT/US2015017124

申请日：2015-02-23

Applicant: CIRRUS LOGIC INC

Inventor： KWATRA NITIN ,  MELANSON JOHN L

IPC: H04R1/10 ,  H04R5/04

CPC classification number: H04R1/1083 ,  H04R5/04 ,  H04R2410/05 ,  H04R2460/01 ,  H04R2499/11

Abstract: Based on transducer status input signals indicative of whether headphones housing respective transducers are engaged with ears of a listener, a processing circuit may determine whether the headphones are engaged with respective ears of the listener. Responsive to determining that at least one of the headphones is not engaged with its respective ear, the processing circuit may modify at least one of a first output signal to the first transducer and a second output signal to the second transducer such that at least one of the first output signal and the second output signal is different than such signal would be if the headphones were engaged with their respective ears.

Abstract translation: 基于指示容纳各个换能器的耳机是否与收听者的耳朵接合的换能器状态输入信号，处理电路可以确定耳机是否与收听者的各个耳朵接合。 响应于确定耳机中的至少一个耳机未与其各自的耳朵接合，处理电路可以修改至第一换能器的第一输出信号和至第二换能器的第二输出信号中的至少一个，使得至少一个 第一输出信号和第二输出信号与如果耳机与它们各自的耳朵接合时的信号不同。

公开(公告)号：WO2012166273A3

公开(公告)日：2013-09-19

申请号：PCT/US2012035815

申请日：2012-04-30

Applicant: CIRRUS LOGIC INC

Inventor： HENDRIX JON D ,  KAMATH GAUTHAM DEVENDRA ,  KWATRA NITIN ,  ABDOLLAHZADEH MILANI ALI ,  ALDERSON JEFFREY

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K11/17827 ,  G10K11/1784 ,  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和测量输出的输出的误差麦克风信号中产生抗噪声信号 传感器加上该位置的任何环境音频，并将抗噪声信号注入换能器输出，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系数自适应。

公开(公告)号：WO2012166507A3

公开(公告)日：2013-05-16

申请号：PCT/US2012039314

申请日：2012-05-24

Applicant: CIRRUS LOGIC INC

Inventor： KWATRA NITIN ,  ABDOLLAHZADEH MILANI ALI ,  ALDERSON JEFFREY

IPC: G10K11/178

CPC classification number: G10K11/1784 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3017 ,  G10K2210/3028 ,  G10K2210/507 ,  G10K2210/508 ,  G10K2210/511 ,  G10K2210/512 ,  G10L21/0208 ,  G10L21/0364

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 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.

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他换能器输出中以引起环境音频声音的消除。 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，并估计从噪声消除电路通过换能器的电声路径。 自适应地产生抗噪声信号以最小化误差麦克风处的环境音频声音。 执行自适应噪声消除（ANC）功能的处理电路还对一个或两个参考和/或误差麦克风信号进行滤波，以将自适应滤波器的自适应偏置在一个或多个频率区域中，以改变最小化的程度 错误麦克风处的环境声音发出声音。

公开(公告)号：WO2012166388A2

公开(公告)日：2012-12-06

申请号：PCT/US2012038512

申请日：2012-05-18

Applicant: CIRRUS LOGIC INC

Inventor： ALDERSON JEFFREY ,  KWATRA NITIN ,  KAMATH GAUTHAM DEVENDRA ,  ABDOLLAHZADEH MILANI ALI ,  MELANSON JOHN L

IPC: G10K11/16

CPC classification number: G10K11/178 ,  G10K11/1784 ,  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.

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他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配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）功能的处理电路还可以相对于参考麦克风信号来调整抗噪声信号的频率响应，和/或通过调整自适应滤波器的响应，独立于由 参考麦克风信号。