Title :
Single board video codec for ISDN visual telephone
Author :
Tajiri, Tetsuo ; Suzuki, Yutaka ; Nishimura, Shinji ; Yoshimura, Hiroshi
Author_Institution :
NTT Human Interface Lab., Kanagawa-ken, Japan
Abstract :
A single board video codec for ISDN B/2B channel transmission, which depends on a CCITT standardization p×64 video coding algorithm and communication protocol, has been developed. The video codec is constructed with newly designed DSPs, four kinds of NTSC-CIF (Common Intermediate Format) mutual conversion LSIs, a transmission codec LSI and an AD/DA hybrid IC. The video codec codes and decodes a full CIF signal at a frame rate of 10 frames/s and communicates over either an ISDN 64 kb/s or 2×6 64 kb/s channel. The codec is fabricated on a single small board with a size of 280 mm×280 mm. Furthermore, a desk-top prototype visual telephone terminal which uses the video codec, voice codec and NCU has been developed
Keywords :
ISDN; VLSI; codecs; digital signal processing chips; interactive terminals; large scale integration; standardisation; video equipment; videotelephony; 64 kbit/s; AD/DA hybrid IC; ADC; CCITT standardization; Common Intermediate Format; DAC; DSP; ISDN; LSI; NCU; NTSC-CIF; VLSI; communication protocol; frame rate; single board video codec; video coding algorithm; videotelephony; voice codec; Digital signal processing; Hybrid integrated circuits; ISDN; Large scale integration; Protocols; Signal design; Standardization; Telephony; Video codecs; Video coding;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0003-3
DOI :
10.1109/ICASSP.1991.150997
