公开(公告)号：US20130301847A1

公开(公告)日：2013-11-14

申请号：US13727718

申请日：2012-12-27

Applicant: CIRRUS LOGIC, INC.

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

IPC: G10K11/16

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. Adaptation of adaptive filters is sequenced so that update of their coefficients does not cause instability or error in the update. A level of the source audio with respect to the ambient audio can be 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。 对自适应滤波器的适应进行排序，以便更新其系数不会导致更新中的不稳定或错误。 可以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：US20130287218A1

公开(公告)日：2013-10-31

申请号：US13692367

申请日：2012-12-03

Applicant: CIRRUS LOGIC, INC.

Inventor： Jeffrey Alderson ,  Jon D. Hendrix

IPC: G10K11/00

CPC classification number: G10K11/002 ,  G10K11/17819 ,  G10K11/17833 ,  G10K2210/1081 ,  G10K2210/505 ,  G10K2210/506

Abstract: A personal audio device, such as a headphone, 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 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 reference microphone. A processing circuit uses the reference microphone to generate the anti-noise signal, which can be generated by an adaptive filter. The processing circuit also models an acoustic leakage path from the transducer to the reference microphone and removes elements of the source audio appearing at the reference microphone signal due to the acoustic output of the speaker. Another adaptive filter can be used to model the acoustic leakage path.

Abstract translation: 诸如耳机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，并将抗噪声信号与源音频组合 为扬声器提供输出。 抗噪声信号会导致出现在参考麦克风处的环境音频声音的消除。 处理电路使用参考麦克风来产生可由自适应滤波器产生的抗噪声信号。 处理电路还对从换能器到参考麦克风的声音泄漏路径建模，并且由于扬声器的声输出而去除出现在参考麦克风信号处的源音频的元素。 另一种自适应滤波器可用于对声学泄漏路径建模。