Cable broadcasting system and the transmission center for on dem

Details Cable broadcasting system and the transmission center for on dem Cable broadcasting system and the transmission center for on dem

1992-05-22

1994-08-16

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 951, 348 7, 455 42, H04N 7173

Patent

active

053393155

ABSTRACT:
The present invention provides a cable broadcasting system and the transmission center employed therein. In the transmission center, plural images are divided into several groups in the same kinds and each image in one kind is repeated not simultaneously so that they are outputted as independent plural image signals, and the image that the subscribers have requested is selected from those plural image signals which is enciphered, modulated, and multiplexed to be transmitted in optical transmission lines through an available channel to the subscribers, while the transmission channel is validated as well as the enciphered image signal is deciphered at the subscribers' end in order to enable the subscribers to watch the image they have requested.

REFERENCES:
patent: 4205343 (1980-05-01), Barrett
patent: 4484027 (1984-11-01), Lee
patent: 4658292 (1987-04-01), Okamoto et al.
patent: 4890322 (1989-12-01), Russell, Jr.
patent: 5172413 (1992-12-01), Bradley et al.
An FM-FDM Hi-Vision Optical CATV System Employing Demand Access Method by Mikio Maeda et al. 1989 Shingakugiho vol. 89, No. 304 pp. 7-12.
Switched Digital Video-The Opportunities and Challenges of Heathrow by Alan F. Graves Nat'l Comm. Forum, vol. 43, No. 2 pp. 1125-1128.

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