Title :
An advanced 32 kbit/s ADPCM coding to transmit speech and high-speed voiceband data
Author :
Fukasawa, Atsushi ; Hosoda, Kenichiro ; Kanda, Takashi ; Yatsuzuka, Yohtaro ; Takahashi, Makoto
Author_Institution :
Oki Electric Industry Co. Ltd., Tokyo, Japan
Abstract :
This paper describes a performance evaluation of an advanced 32 kbit/s ADPCM hardware codec in terms of speech and high-speed voiceband data, V.27 and V.29 at 4.8, 7.2 and 9.6 kbit/s. The results indicated that the advanced 32 kbit/s ADPCM provided an equivalent subjective speech quality to that of the G.721 ADPCM recommended by the CCITT, and was able to maintain the transparency of these high-speed voiceband data at 7.2 kbit/s over at least four and at 9.6 kbit/s over at least two asynchronous tandem links, respectively. Furthermore, the advanced ADPCM can quickly recover a complete synchronous operation in the tandem connections, as burst errors or short-hits damage the digital links.
Keywords :
Adaptive control; Adaptive filters; Decoding; Hardware; Poles and zeros; Programmable control; Speech codecs; Speech coding; Transfer functions; Transversal filters;
Conference_Titel :
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86.
DOI :
10.1109/ICASSP.1986.1169143