Title :
A 32 kbit/s ADPCM algorithm having high performance for both voice and 9.6 kbit/s modem signals
Author :
Hosoda, Kenichiro ; Noguchi, Osamu ; Yatsuzuka, Yohtaro
Author_Institution :
Oki Electr. Ind. Co. Ltd., Tokyo, Japan
fDate :
2/1/1988 12:00:00 AM
Abstract :
A description is given of an advanced 32-kb/s ADPCM (adaptive digital pulse code modulation) algorithm and its implementation in a single-chip custom LSI using 2-μm CMOS technology. The performance of the proposed codec, in terms of voice and modems operating at 1200-9600 b/s, is also discussed. The results indicate that the codec provides speech quality equivalent to that of the CCITT G.721 ADPCM and is capable of transmitting V.23 1200 b/s and V.27 and V.29 4800 b/s signals over at least four asynchronous tandem links. It can also transmit V.29 modem signals at 7200 b/s over at least four and at 9600 b/s over two asynchronous tandem links, and V.32 signals at 9600 b/s over four asynchronous tandem links
Keywords :
CMOS integrated circuits; codecs; large scale integration; modems; pulse-code modulation; speech analysis and processing; 1200 to 9600 bits/s; 2 micron; 32 kbits/s; 9.6 kbits/s; ADPCM algorithm; CCITT G.721 ADPCM; CMOS technology; V.23; V.27; V.29; V.32 signals; adaptive digital pulse code modulation; asynchronous tandem links; codec; modem signals; single-chip custom LSI; speech quality; voice signals; Adaptive control; Algorithm design and analysis; CMOS technology; Codecs; Decoding; Large scale integration; Modems; Phase change materials; Programmable control; Telecommunication traffic;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
