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Research and Implementation of G729A Speech Codec Based on TMS320DM642

Xie Dai-hua

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Abstract

G729 speech codec (encoder and decoder) algorithm and the TMS320DM642 fixed-point digital signal processing (DSP) chip are briefly described in this paper. Our emphasis is put on the algorithm optimization of the low bit rate speech codec based on TMS320DM642 chip. Also, some key techniques for the real-time implementation of the complex algorithm on fixed-point DSP are discussed. The results show that the real-time implementation of G729 speech coder on fixed-point DSP can produce 8 kb/s low bit rate, lower algorithm delay and toll-quality speech.

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What this paper is about

G729 speech codec (encoder and decoder) algorithm and the TMS320DM642 fixed-point digital signal processing (DSP) chip are briefly described in this paper. Our emphasis is put on the algorithm optimization of the low bit rate speech codec based on TMS320DM642 chip. Also, some key techniques for the real-time implementation of the complex algorithm on fixed-point DSP are discussed. The results show that the real-time implementation of G729 speech coder on fixed-point DSP can produce 8 kb/s low bit rate, lower algorithm delay and toll-quality speech.

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Available abstract

G729 speech codec (encoder and decoder) algorithm and the TMS320DM642 fixed-point digital signal processing (DSP) chip are briefly described in this paper. Our emphasis is put on the algorithm optimization of the low bit rate speech codec based on TMS320DM642 chip. Also, some key techniques for the real-time implementation of the complex algorithm on fixed-point DSP are discussed. The results show that the real-time implementation of G729 speech coder on fixed-point DSP can produce 8 kb/s low bit rate, lower algorithm delay and toll-quality speech.

Key concepts: Computer science, Codec, Digital signal processing, Adaptive Multi-Rate audio codec, Encoder, Codec2, Speech coding, Code-excited linear prediction

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