Low Complexity CELP Speech Coding at 4.8 kbps

Low Complexity CELP Speech Coding at 4.8 kbps

Title : Low Complexity CELP Speech Coding at 4.8 kbps
Authors :
Kao, Yu-Hung
Conference : M.S. Thesis Number: CSHCN MS 92-10
Date: December 31 - December 31, 1990

Low bit rate, high quality speech coding is a vital part in voice telecommunication systems. The introduction of CELP (1982) (Codebook Excited Linear Prediction) speech coding provides a feasible way to compress speech data to 4.8 kbps with high quality, but the firmidable compuational complexity required for rea-time processing has prevented its wide application. In this thesis, we reduce the computational complexity to 5 MIPS (million instructions per second), which can be handled by even inexpensive DSP chips, while maintaining the same high quality. We hope our contribution can finally make CELP coding a widely applicable technology.

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