Towards speech recognition oriented dereverberation

We show the effect of reverberation on the speech recognition performance in a far-field microphone. Given the reference of a close-talk microphone signal, an improvement is shown using an asymmetric non-causal inverse filter both in a synthetic and real room environment. Its variants in time and frequency domain are also presented and compared with other existing techniques. We argue for the approaches which specifically consider recognition performance as a goal in deriving the dereverberating schemes, with evaluation on real room recording recognition, as a future direction for solving reverberation problems in speech recognition.

[1]  Alexander H. Waibel,et al.  The effects of room acoustics on MFCC speech parameter , 2000, INTERSPEECH.

[2]  Les E. Atlas,et al.  Acoustic diversity for improved speech recognition in reverberant environments , 2002, 2002 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[3]  Alberto Bellini,et al.  Car cockpit equalization by warping filters , 2001, IEEE Trans. Consumer Electron..

[4]  Li Deng,et al.  Enhancement of log Mel power spectra of speech using a phase-sensitive model of the acoustic environment and sequential estimation of the corrupting noise , 2004, IEEE Transactions on Speech and Audio Processing.

[5]  Steven Kay,et al.  Fundamentals Of Statistical Signal Processing , 2001 .

[6]  Jont B. Allen,et al.  Image method for efficiently simulating small‐room acoustics , 1976 .

[7]  John Mourjopoulos,et al.  Results for Room Acoustics Equalisation Based on Smoothed Responses , 2003 .

[8]  James L. Flanagan,et al.  Optimal truncation time for matched filter array processing , 1998, Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181).

[9]  Michael S. Brandstein.  An event-based method for microphone array speech enhancement , 1999, 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258).