Cable broadcasting system and the transmission center for on demand program services
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United States of America Patent
Stats
-
Aug 16, 1994
Grant Date -
N/A
app pub date -
May 22, 1992
filing date -
May 24, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Family
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