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KMID : 0917520040110010007
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Journal of Speech Sciences
2004 Volume.11 No. 1 p.7 ~ p.20
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Harmonics-based Spectral Subtraction and Feature Vector Normalization for Robust Speech Recognition
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Beh Joung-Hoon
Lee Heung-Kyu
Kwon Oh-Il
Ko Han-Seok
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Abstract
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In this paper, we propose a two-step noise compensation algorithm in feature extraction for achieving robust speech recognition. The proposed method frees us from requiring a priori information on noisy environments and is simple to implement. First, in frequency domain, the Harmonics-based Spectral Subtraction (HSS) is applied so that it reduces the additive background noise and makes the shape of harmonics in speech spectrum more pronounced. We then apply a judiciously weighted variance Feature Vector Normalization (FVN) to compensate for both the channel distortion and additive noise. The weighted variance FVN compensates for the variance mismatch in both the speech and the non-speech regions respectively. Representative performance evaluation using Aurora 2 database shows that the proposed method yields 27.18% relative improvement in accuracy under a multi-noise training task and 57.94% relative improvement under a clean training task.
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KEYWORD
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Spectral subtraction, Harmonics, Robust speech recognition, Feature vector normalization
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