Video-on-demand system
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United States of America Patent
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-
Aug 11, 1998
Grant Date -
N/A
app pub date -
Jan 31, 1996
filing date -
Jun 6, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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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