Publications – Details
Adaptive Sampling Rate Correction for Acoustic Echo Control in Voice-Over-IP
- Authors:
- Matthias Pawig, Gerald Enzner, and Peter Vary
- Journal:
- IEEE Transactions on Signal Processing
- Volume:
- 58
- Number:
- 1
- Date:
- Jan. 2010
- Pages:
- 189–199
- 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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