Title :
Variable-rate voice communication using ADPCM in ATM networks
Author :
Fujiya, Hiroshi ; Saito, Kyuta
Author_Institution :
NTT Commun. Switching Labs., Tokyo, Japan
Abstract :
A variable-bit-rate voice coding suitable for asynchronous transfer mode (ATM) networks is described. The method uses an ADPCM coder that can operate at 2, 3, 4, or 5 b/sample, depending on parameters such as incoming signal power and prediction gain. It aims at processing simplicity and high quality when applied to ATM cell assembly/disassembly equipment. Experiments with several voice samples show that average rates are one third to one half of 64 kb/s with quality almost equivalent to PCM coding
Keywords :
encoding; pulse-code modulation; speech analysis and processing; time division multiplexing; ADPCM coder; ATM cell assembly/disassembly equipment; ATM networks; asynchronous transfer mode; encoding; high quality; incoming signal power; prediction gain; processing simplicity; pulse code modulation; variable-bit-rate voice coding; Assembly systems; Asynchronous transfer mode; Communication switching; Costs; Decoding; Distortion; Intelligent networks; Laboratories; Quantization; Speech coding;
Conference_Titel :
Communications, 1991. ICC '91, Conference Record. IEEE International Conference on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0006-8
DOI :
10.1109/ICC.1991.162291
