Speech enhancement using hybrid gain factor in critical-Band-Wavelet Packet Transform

ASIAIR > College of Computer Science > Department of Information Communication > Journal Article > Item 310904400/19094

Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/19094

Title:	Speech enhancement using hybrid gain factor in critical-Band-Wavelet Packet Transform
Authors:	陸清達;Lu, Ching-Ta
Contributors:	資訊傳播學系
Keywords:	Speech enhancement;Gain factor;Perceptual constraint;Wavelet decomposition
Date:	2007-01
Issue Date:	2012-11-26 07:16:59 (UTC+0)
Abstract:	Noise masking threshold (NMT) has been extensively applied in wavelet-based speech enhancement. A gain factor is typically derived according to the NMT to suppress the additive noise. This investigation proposes a gain factor in each wavelet subband subject to a perceptual constraint. This perceptual constraint preserves the wavelet coefficients (WCs) of noisy speech when the level of residual noise is smaller than the NMT. If the residual noise level exceeds the NMT, then the wavelet coefficients of noisy speech are suppressed to reduce the corrupting noise. A lower bound on the gain factor is also proposed to prevent low-SNR regions, such as unvoiced signal, from being over-attenuated. Experimental results show that the proposed approach improves the naturalness, and does not cause annoying residual noise in the enhanced speech.
Relation:	DIGITAL SIGNAL PROCESSING
Appears in Collections:	[Department of Information Communication] Journal Article

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