Title :
A new low bit rate low delay algebraic CELP (ACELP) coder
Author :
El-Kouatly, Rand ; El-Ramiy, S.H.
Author_Institution :
Elect. & Comm. Eng. Dept., Ain Shams Univ., Cairo, Egypt
Abstract :
The coders based upon ITU-T G.729 standard and its new version G.729A provide toll-quality speech for most operating conditions, and these coders are the prime candidates for the next generation of cellular systems. This paper presents new techniques for reducing the bit rate of these coders from 8 kbits/s to 7 kbits/s without introducing any bad effects into the coders´ performance in clean or noisy environments, and without increasing the codec delay. The new coder is called algebraic CELP (ACELP) and has 7 kbits/s with 15 ms algorithmic delay
Keywords :
algebraic codes; cellular radio; code standards; delays; linear predictive coding; vocoders; 7 kbit/s; 8 kbit/s; ACELP coder; ITU-T G.729 standard; ITU-T G.729A standard; cellular systems; clean environment; codec delay; low bit rate low delay algebraic CELP coder; noisy environment; performance; toll-quality speech; Background noise; Bit rate; Code standards; Communication standards; Delay effects; Noise reduction; Noise robustness; Speech analysis; Speech enhancement; Working environment noise;
Conference_Titel :
Radio Science Conference, 2000. 17th NRSC '2000. Seventeenth National
Conference_Location :
Minufiya
Print_ISBN :
977-5031-64-8
DOI :
10.1109/NRSC.2000.838933
