Adaptive Sampling Rate Correction for Acoustic Echo Control in Voice-Over-IP

Authors:

Pawig, M. ,  Enzner, G. ,  Vary, P.

Journal:

(IEEE TSP)

Volume:

58

Page(s):

189 - 199

number:

1

Date:

Jan. 2010

ISSN:

1053-587X

Language:

English

Abstract

Hands-free terminals for speech communication employ adaptive filters to reduce echoes resulting from the acoustic coupling between loudspeaker and microphone. When using a personal computer with commercial audio hardware for teleconferencing, a sampling frequency offset between the loudspeaker output D/A converter and the microphone input A/D converter often occurs. In this case, state-of-the-art echo cancellation algorithms fail to track the correct room impulse response. In this paper, we present a novel least mean square (LMS-type) adaptive algorithm to estimate the frequency offset and resynchronize the signals using arbitrary sampling rate conversion. In conjunction with a normalized LMS-type adaptive filter for room impulse response tracking, the proposed system widely removes the deteriorating effects of a frequency offset up to several Hz and restores the functionality of echo cancelation.

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