Hits:

Indexed by:Journal Papers

Date of Publication:2020-02-01

Journal:SIGNAL PROCESSING

Included Journals:EI、SCIE

Volume:167

ISSN No.:0165-1684

Key Words:Adaptive feedback cancellation; Public address; Variable step-size; Affine projection algorithm; Prediction error method; Howling suppression

Abstract:Train public address (PA) system is an important component of Passenger Information System. Acoustic feedback is a well-known problem in public address systems. It will cause howling under certain conditions, which can severely degrade sound quality and limit the maximum allowable amplification of the PA systems. The general adaptive feedback cancellation (AFC) algorithms lead to a biased estimation because of the correlation between source and feedback signals. In order to solve the problem and achieve both fast convergence and low steady-state misalignment, a novel variable step-size improved proportionate affine projection algorithm (IPAPA) based on mixed error cost function with prediction error method (PEM) and howling suppression is proposed in this paper. The experimental results demonstrate the effectiveness of the proposed algorithm. (C) 2019 Elsevier B.V. All rights reserved.