Abstract
Beamforming methods for speech enhancement in wireless acoustic sensor networks (WASNs) have recently attracted the attention of the research community. One of the major obstacles in implementing speech processing algorithms in WASN is the sampling rate offsets between the nodes. As nodes utilize individual clock sources, sampling rate offsets are inevitable and may cause severe performance degradation. In this paper, a blind procedure for estimating the sampling rate offsets is derived. The procedure is applicable to speech-absent time segments with slow time-varying interference statistics. The proposed procedure is based on the phase drift of the coherence between two signals sampled at different sampling rates. Resampling the signals with Lagrange polynomials interpolation method compensates for the sampling rate offsets. An extensive experimental study, utilizing the transfer function generalized sidelobe canceller (TFGSC), exemplifies the problem and its solution.
Original language | English |
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Title of host publication | International Workshop on Acoustic Signal Enhancement, IWAENC 2012 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
ISBN (Electronic) | 9783800734511 |
State | Published - 2012 |
Event | International Workshop on Acoustic Signal Enhancement, IWAENC 2012 - Aachen, Germany Duration: 4 Sep 2012 → 6 Sep 2012 |
Publication series
Name | International Workshop on Acoustic Signal Enhancement, IWAENC 2012 |
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Conference
Conference | International Workshop on Acoustic Signal Enhancement, IWAENC 2012 |
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Country/Territory | Germany |
City | Aachen |
Period | 4/09/12 → 6/09/12 |
Bibliographical note
Publisher Copyright:© 2012, Institute of Electrical and Electronics Engineers Inc. All rights reserved.
Keywords
- Beamforming
- Synchronization
- WASN