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KMID : 0917519980030010167
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Journal of Speech Sciences
1998 Volume.3 No. 1 p.167 ~ p.176
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Variable Time-Scale Modification of Speech Using Transiet Information based on LPC Cepstral Distance
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Lee Sung-Joo
Kim Hee-Dong
Kim Hyung-Soon
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Abstract
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Conventional time-scale modification methods have the problem that as the modificaion rate gets higher the time-scale modified speech signal becomes less intelligible, because they ignore the effect of articulation rate on speech characteristics. Results of research on speech perception show that the timing information of transient portions of a speech signal plays an important role in discriminating among different speech sounds. Inspired by this fact, we purpose a novel scheme for modifying the time-scale of speech. In the proposed scheme, the timing information of the transient portions of speech is preserved, while the steady portions of speech are compressed or expanded somewhat excessively for maintaining overall time-scale change. In order to identify the transient and steady portions of a speech signal, we employ a simple method using LPC cepstral distance between neighboring frames. The result of the subjective preference test indicates that the proposed method produces performance superior to that of the conventional SOLA method, especially for very fast playback case.
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KEYWORD
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time scale modification, transient information
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