Generalized Optimal Multi-Microphone Speech Enhancement Using Sequential Minimum Variance Distortionless Response(MVDR) Beamforming and Postfiltering

Author

Kim, Lae-Hoon ; Hasegawa-Johnson, Mark ; Sung, Koeng-Mo

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL

Volume

3

fYear

2006

fDate

14-19 May 2006

Abstract

A theoretical basis for optimal multichannel speech enhancements presented, sufficient, flexible to be used with any assumed statistical model and optimality criterion. Any Bayesian optimal one-channel estimator for speech enhancement can be generalized to the multichannel case as a sequentially constructed minimum variance distortionless response (MVDR) beamformer followed by an optimal one-channel postfilter. We present experimental results using the minimum mean-square error log-spectral amplitude (MMSE-logSA) optimality criterion, applied to a statistical model with simplified channel but realistic inter-microphone noise coherence. Word error rate in the audio-visual speech in a car (AVICAR) corpus (moving car, windows open) is reduced from 18% to 9%

Keywords

Bayes methods; array signal processing; error statistics; filtering theory; least mean squares methods; speech enhancement; statistical analysis; AVICAR corpus; Bayesian optimal one-channel estimator; audio-visual speech; generalized optimal multi-microphone speech enhancement; log-spectral amplitude optimality criterion; minimum mean-square error optimality criterion; optimal multichannel speech enhancements; optimal one-channel postfilter; realistic inter-microphone noise coherence; sequential minimum variance distortionless response beamforming; statistical model; word error rate; Amplitude estimation; Array signal processing; Bayesian methods; Coherence; Error analysis; Microphones; Noise level; Noise robustness; Speech enhancement; Statistics;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on

Conference_Location

Toulouse

ISSN

1520-6149

Print_ISBN

1-4244-0469-X

Type

conf

DOI

10.1109/ICASSP.2006.1660591

Filename

1660591