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：US20140369517A1

公开(公告)日：2014-12-18

申请号：US13917843

申请日：2013-06-14

Applicant: Cirrus Logic, Inc.

Inventor： Dayong Zhou ,  Yang Lu

IPC: G10K11/178

CPC classification number: H04R3/005 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/503 ,  H04R2460/01 ,  H04R2499/11

Abstract: In accordance with methods and systems of the present disclosure, an integrated circuit for implementing at least a portion of a personal audio device may include an output including an anti-noise signal, a reference microphone input, an error microphone input, and a processing circuit. The processing circuit may implement an adaptive filter having a response that generates the anti-noise signal from the reference microphone signal to reduce the presence of the ambient audio sounds heard by the listener, wherein the processing circuit may implement a coefficient control block that shapes the response of the adaptive filter in conformity with the error microphone signal and the reference microphone signal by adapting the response of the adaptive filter in accordance with a calculated narrow-band-to-full-band ratio, wherein the narrow-band-to-full-band ratio is a function of a narrow-band power of the reference microphone signal divided by a full-band power of the reference microphone signal.

Abstract translation: 根据本公开的方法和系统，用于实现个人音频设备的至少一部分的集成电路可以包括包括抗噪声信号，参考麦克风输入，误差麦克风输入和处理电路的输出 。 处理电路可以实现具有从参考麦克风信号产生抗噪声信号的响应的自适应滤波器，以减少由收听者听到的环境音频声音的存在，其中处理电路可以实现一个系数控制块， 通过根据计算的窄带到全带比适应自适应滤波器的响应，自适应滤波器的响应与误差麦克风信号和参考麦克风信号一致，其中窄带到满 带比是参考麦克风信号的窄带功率除以参考麦克风信号的全频带功率的函数。

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。