Systems and methods for adaptive noise cancellation including dynamic bias of coefficients of an adaptive noise cancellation system

Patent metadata

Field	Value
Publication number	US-9066176-B2
Application number	US-201313950854-A
Country	US
Kind code	B2
Filing date	Jul 25, 2013
Priority date	Apr 15, 2013
Publication date	Jun 23, 2015
Grant date	Jun 23, 2015

Abstract

In accordance with method and systems of the present disclosure, a 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, 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 to minimize the ambient audio sounds in the error microphone signal, and a coefficient bias control block which biases coefficients of the coefficient control block towards zero in a range of frequencies outside of a frequency response of the source audio signal.

First claim

What is claimed is:

1. A personal audio device comprising:
a transducer for reproducing an audio signal including both a source audio signal for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer;
a reference microphone for providing a reference microphone signal indicative of the ambient audio sounds;
an error microphone located in proximity to the transducer for providing an error microph…

Assignees

• Cirrus Logic Inc

Inventors

• Hendrix Jon D
• Li Ning
• Alderson Jeffrey D

Classifications

• G10K2210/3026

  Physics · mapped topic

• H04R1/1083

  Electricity · mapped topic

• G10K2210/3028

  Physics · mapped topic

• H04R5/033 Primary

  Electricity · mapped topic

• G10K11/1784

  Physics · mapped topic