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An improved CELP by the separate coding of pulsive and random residuals

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2 Author(s)
Nakata, K. ; Tokyo University of Agriculture and Technology, Tokyo, Japan ; Komine, S.

Main drawback of the CELP coding is a S/N degradation when the duration of VQ of residuals becomes long in order to reduce bit-rate. The reason is an incomplete long time-prediction. Then, residuals are separated into pulsive and random components. After the separation, random residuals are coded by VQ with a random waveform code book, and pulsive components are coded in their timing and amplitude. The improved coding can transmit high quality of speech in less than 16 k bps.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86.  (Volume:11 )

Date of Conference:

Apr 1986