Speech decoding method and apparatus

Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission

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704223, G10L 302, G10L 900

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active

057522227

ABSTRACT:
A speech decoding method and apparatus for decoding encoded speech signals and subsequently post-filtering the decoded signals, wherein the filter coefficient of a spectral shaping filter in a post-filter fed with an encoded and subsequently decoded speech signal is updated with a sub-frame period, while the gain of a gain adjustment circuit for correcting gain changes caused by the spectral shaping is updated with a frame period that is eight times as long as the sub-frame period. This achieves switching of the filter coefficient so as to be changed smoothly with a higher follow-up speed, while suppressing level changes otherwise caused by frequent gain switching. The result is improved characteristics of a post-filter used for spectral shaping of a decoded signal supplied from the signal decoder and more effective post-filter processing.

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Yang, Gao et al., "a robust and fast DP-CELP(Double-Pulse CELP) Vocoder at the Bit Rate of 4 kb/s" Speech, Image Processing, and Neural Networks 1994 Int'l Symposium,pp. 563-566.
Yang, Haiyun et al., "a 5.4 kbps Speech Coder Based on Multi-Band Excitation and linear Predictive Coding" TENCON '94, pp. 417-421.
Ramamoorthy, V. et al., "enhancement of ADPCM Speech Coding with Backward-Adaptive Algorithms for Postfiltering and Noise Feedback" IEEE Journal on Selected Areas in Communications, 1988, pp. 364-382.

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