Television – Special applications – Manufacturing
Patent
1996-01-31
1998-08-11
Peng, John K.
Television
Special applications
Manufacturing
348 6, 348 12, 348 13, 348 17, 348 11, 455 51, 455 61, 455 621, H04N 710
Patent
active
057934118
ABSTRACT:
A video-on-demand system is comprised of a source station which transmits video signals of different channels on an optical transmission line to a number of subscriber terminals in accordance with subscriber requests. The source station includes a multiplexing unit which generates a frequency division multiplexed signal from the video signals in such a manner that vertical synchronizations of the video signals of different channels are in accordance with each other, and transmits the multiplexed signal to each subscriber terminal. Each subscriber terminal includes a transmitting unit which transmits a control signal indicative of a subscriber request to the source station at a frequency band different from frequency bands of the video signals of the frequency division multiplexed signal, the control signal being transmitted during a vertical blanking period of the video signals.
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Fujitsu Limited
Lo Linus H.
Peng John K.
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