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IEICE Transactions on Information and Systems 2008 E91-D(3):402-410; doi:10.1093/ietisy/e91-d.3.402
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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

Noise Suppression Based on Multi-Model Compositions Using Multi-Pass Search with Multi-Label N-gram Models

Takatoshi JITSUHIRO1, Tomoji TORIYAMA1 and Kiyoshi KOGURE1

1 The authors are with the ATR Knowledge Science Laboratories, Kyoto-fu, 619–0288 Japan. E-mail: takatoshi.jitsuhiro{at}atr.jp


  Abstract

We propose a noise suppression method based on multi-model compositions and multi-pass search. In real environments, input speech for speech recognition includes many kinds of noise signals. To obtain good recognized candidates, suppressing many kinds of noise signals at once and finding target speech is important. Before noise suppression, to find speech and noise label sequences, we introduce multi-pass search with acoustic models including many kinds of noise models and their compositions, their n-gram models, and their lexicon. Noise suppression is frame-synchronously performed using the multiple models selected by recognized label sequences with time alignments. We evaluated this method using the E-Nightingale task, which contains voice memoranda spoken by nurses during actual work at hospitals. The proposed method obtained higher performance than the conventional method.

Key Words: speech recognition, noise suppression, model composition, multi-pass search, E-Nightingale project

Manuscript received June 25, 2007. Manuscript revised September 14, 2007.


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