Proceedings of the Acoustical Society of Korea Conference (한국음향학회:학술대회논문집)
- 1998.08a
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- Pages.136-141
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- 1998
Improving The Excitation Signal for Low-rate CELP Speech Coding
저전송속도 CELP 부호화기에서 여기신호의 개선
Abstract
In order to enhance the performance of a CELP coder at low bit rates, it would be necessary to make the CELP excitation have the peaky pulse characteristic. In this paper we introduce an excitation signal with peaky pulse characteristic. It is obtained by using a two-tap pitch predictor. Samples of the signal have different gains according to their amplitudes by the predictor. In voiced sound the signal has the desirable peaky pulse characteristic, and its periodicity is well reproduced. Particularly, peaky pulses at voiced onset and a burst of plosive sound are clearly reconstructed.
Keywords