Title :
Bias reduction in acoustic feedback cancellation systems with varying all-pass filters
Author :
Boukis, C. ; Mandic, D.P. ; Constantinides, A.G.
Author_Institution :
Athens Inf. Technol., AGC Group, Peania, Greece
fDate :
4/27/2006 12:00:00 AM
Abstract :
A method for the minimisation of the bias in closed-loop system identification is presented. This is achieved using all-pass filters with time-varying poles within the forward path, which aims at decorrelating the input and the output signal. An analysis of the proposed method and expressions for the input-output correlation in the steady state are provided. Comprehensive simulations are given to support the proposed approach whereby misalignment curves are compared to those obtained with the use of simple delays.
Keywords :
acoustic signal processing; all-pass filters; closed loop systems; hearing aids; minimisation; time-varying filters; acoustic feedback cancellation systems; all-pass filters; bias reduction; closed-loop system identification; hearing aids; input-output correlation; minimisation method; misalignment curves; time-varying poles;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20060470
