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Implementation of dual rate speech codec based on VC5409

Lizhong Wang

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Abstract

ITU-T G.732.1 is a dual rate speech codec standard from International Telecommunication Union(ITU).This codec has two kinds of bit rates,i.e.,5.3 bit/s and 6.3 bit/s,which corresponds to two different algorithms.For 5.3 bit/s codec,Algebraic Code Excited Linear Prediction(ACELP)principles are used,while for the 6.3 bit/s codec,Multi Pulse-Maximum Likelihood Quantization(MP-MLQ)techniques are used.This paper firstly introduces the principle and implementation of the encoding/decoding algorithms of G.723.1 codec, and then on this basis, it focuses on the work in developing a real time full-duplex speech codec based on TMS320VC5409. The codec has passed the verification by all test vectors of G.723.1.

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What this paper is about

ITU-T G.732.1 is a dual rate speech codec standard from International Telecommunication Union(ITU).This codec has two kinds of bit rates,i.e.,5.3 bit/s and 6.3 bit/s,which corresponds to two different algorithms.For 5.3 bit/s codec,Algebraic Code Excited Linear Prediction(ACELP)principles are used,while for the 6.3 bit/s codec,Multi Pulse-Maximum Likelihood Quantization(MP-MLQ)techniques are used.This paper firstly introduces the principle and implementation of the encoding/decoding algorithms of G.723.1 codec, and then on this basis, it focuses on the work in developing a real time full-duplex speech codec based on TMS320VC5409. The codec has passed the verification by all test vectors of G.723.1.

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Available abstract

ITU-T G.732.1 is a dual rate speech codec standard from International Telecommunication Union(ITU).This codec has two kinds of bit rates,i.e.,5.3 bit/s and 6.3 bit/s,which corresponds to two different algorithms.For 5.3 bit/s codec,Algebraic Code Excited Linear Prediction(ACELP)principles are used,while for the 6.3 bit/s codec,Multi Pulse-Maximum Likelihood Quantization(MP-MLQ)techniques are used.This paper firstly introduces the principle and implementation of the encoding/decoding algorithms of G.723.1 codec, and then on this basis, it focuses on the work in developing a real time full-duplex speech codec based on TMS320VC5409. The codec has passed the verification by all test vectors of G.723.1.

Key concepts: Codec, Adaptive Multi-Rate audio codec, Full Rate, Codec2, Computer science, Speech coding, Speech recognition, Decoding methods

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