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Design and description of CS-ACELP: a toll quality 8 kb/s speech coder

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11 Author(s)
Salami, R. ; Dept. of Electr. Eng., Sherbrooke Univ., Que., Canada ; Laflamme, C. ; Adoul, J.-P. ; Kataoka, A.
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This paper describes the 8 kb/s speech coding algorithm G.729 which has been standardized by ITU-T. The algorithm is based on a conjugate-structure algebraic CELP (CS-ACELP) coding technique and uses 10 ms speech frames. The codec delivers toll-quality speech (equivalent to 32 kb/s ADPCM) for most operating conditions. This paper describes the coder structure in detail and discusses the reasons behind certain design choices. A 16-b fixed-point version has been developed as part of Recommendation G.729 and a summary of the subjective test results based on a real-time implementation of this version are presented

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Speech and Audio Processing, IEEE Transactions on  (Volume:6 ,  Issue: 2 )