DESIGN AND DESCRIPTION OF CS-ACELP - A TOLL QUALITY 8 KB S SPEECH CODER/

This paper describes the 8 kb/s speech coding algorithm G.729 which ha s been recently standardized by ITU-T, The algorithm is based on a con jugate-structure algebraic CELP (CS-ACELP) coding technique and uses 1 0 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 certai n design choices. A 16-b fixed-point version has been developed as par t of Recommendation G.729 and a summary of the subjective test results based on a real-time implementation of this version are presented.