Control of an adaptive feedback cancellation system based on probe signal injection

Patent metadata

Field	Value
Publication number	US-9100736-B2
Application number	US-201213622880-A
Country	US
Kind code	B2
Filing date	Sep 19, 2012
Priority date	Sep 20, 2011
Publication date	Aug 4, 2015
Grant date	Aug 4, 2015

Abstract

Method and audio processing system determine a system parameter sp in a gain loop of an audio processing system. An alternative scheme is provided for feedback estimation in a multi-microphone audio processing system comprising an injected probe signal. The problem is solved in that a) an expression of an approximation of the expected square of the stationary loop gain, LG stat (ω,n), and b) an expression of the convergence or decay rate of the expected square of the stationary loop gain, LG stat (ω,n), after an abrupt change in one or more system parameters are determined, and in that c) a system parameter sp is determined from one of said expressions under the assumption that other system parameters are fixed. The method has the advantage of providing a relatively simple way of identifying and controlling dynamic changes in the acoustic feedback path(s).

First claim

The invention claimed is:

1. A method of determining a system parameter sp in a gain loop of an audio processing system, the audio processing system comprising
a) a microphone system comprising
a1) a number P of electric microphone paths, each microphone path MP i , i=1, 2, . . . , P, providing a processed microphone signal, each microphone path comprising
a1.1) a microphone M i for converting an input sound comprising a target signal x i to an electric signal y i ;
a1.2)…

Assignees

• Oticon As

Inventors

• Jensen Jesper
• Guo Meng

Classifications

• H04R25/453

  Electricity · mapped topic

• H04R3/02 Primary

  Electricity · mapped topic

• H04R25/407

  Electricity · mapped topic

• H04R27/00

  Electricity · mapped topic

• H04R3/005

  Electricity · mapped topic