Bidirectional video telephony using shared channels on coaxial c

Details Bidirectional video telephony using shared channels on coaxial c Bidirectional video telephony using shared channels on coaxial c

1991-11-04

1994-08-30

Chan, Wing F.

Television

Two-way video and voice communication

User positioning

455 31, 455 63, H04N 714, H04M 1100

Patent

active

053432401

ABSTRACT:
A system and method for providing two-way video telephony between an originating location and a destination location, each equipped with an audio/video display (television) and an audio/video source (camera) using available channels dedicated for video telephony on one or more coaxial cable distribution networks which can be part of existing cable television systems. Each location is equipped with a network interface unit (NIU) which modulates outgoing audio/video information (which can be in analog or digital form) together with outgoing control messages onto an attached coaxial cable network. The NIU also demodulates incoming audio/video information and incoming control messages received from the attached coaxial network. Upstream signals may be transmitted to a cable network head end and then to the head end serving the destination location using demodulators, A/D converters (if not already in digital form), multiplexers, and the switched digital telecommunications network. If an intra-cable system call is involved, certain processing steps may be eliminated. Users of the system contend for available channels on the cable distribution network, and channel assignments are made on a per call basis, only for the duration of the call.

REFERENCES:
patent: 4386365 (1983-05-01), Gargini
patent: 4654866 (1987-03-01), Bottle et al.
patent: 4686667 (1987-08-01), Ohnsorge
patent: 4847829 (1989-07-01), Tompkins et al.
patent: 4893326 (1990-01-01), Duran et al.
patent: 4901367 (1990-02-01), Nicholson
patent: 5027426 (1991-06-01), Chiocca, Jr.
patent: 5138649 (1992-08-01), Krisbergh et al.
"Home Terminals and Collision-Free Approaches to Two-Way Services", Pieter den Toonder, Proceedings of International Conference on Satellite & CATV, May 1983 Conference, pp. 405-416.
"CATV" Masayoshi Sugita, et al., National Technical Report, vol. 32, No. 3, Jun. 1986, pp. 99-107.
"Two-Way Cable System Using Residential CATV Facilities-NCTA Referred", Semir Sirazi, et al., IEEE International Conference on Consumer Electronics, Jun. 1984, pp. 224-225.
"Development of an Optical/Coaxial Hybrid CATV System", Kazuo Murayama et al., Sumitomo Electric Technical Review, No. 29, Jan. 1990, pp. 137-145.
"First Results from Life Operation of the Biarritz Broadband Multiservice Network", Philippe Touyarot, et al., Internatonal Switching Symposium, 1987 Proceedings, Mar. 17, 1987, vol. 2, pp. 0229-0233.
"An Emerging Service", P. Barnes, Electronic Technology, vol. 20, Mar. 1986, pp. 280-281.
"Interactive Services in French Videocommunication Networks", H. Seguin, et al., Globecom Tokyo 1987, pp. 2000-2004.

Affiliated with

Also associated with

Rating

Bidirectional video telephony using shared channels on coaxial c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Bidirectional video telephony using shared channels on coaxial c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bidirectional video telephony using shared channels on coaxial c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-32681