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IEICE Transactions on Information and Systems 2008 E91-D(3):411-421; doi:10.1093/ietisy/e91-d.3.411
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Robust Speech Processing in Realistic Environments -- Papers -- Noisy Speech Recognition

Noisy Speech Recognition Based on Integration/Selection of Multiple Noise Suppression Methods Using Noise GMMs

Norihide KITAOKA1, Souta HAMAGUCHI2 and Seiichi NAKAGAWA2

1 The author is with Nagoya University, Nagoya-shi, 464–8603 Japan. E-mail: kitaoka{at}nagoya-u.jp, 2 The authors are with Toyohashi University of Technology, Toyohashi-shi, 441–8580 Japan.


  Abstract

To achieve high recognition performance for a wide variety of noise and for a wide range of signal-to-noise ratio, this paper presents methods for integration of four noise reduction algorithms: spectral subtraction with smoothing of time direction, temporal domain SVD-based speech enhancement, GMM-based speech estimation and KLT-based comb-filtering. In this paper, we proposed two types of combination methods of noise suppression algorithms: selection of front-end processor and combination of results from multiple recognition processes. Recognition results on the CENSREC-1 task showed the effectiveness of our proposed methods.

Key Words: noisy speech recognition, noise suppression method selection, CENSREC-1

Manuscript received July 2, 2007. Manuscript revised September 18, 2007.


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