US Patent No: 5,793,411
Number of patents in Portfolio can not be more than 2000
Video-on-demand system
Stats
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Aug 11, 1998
Issued date -
Jan 31, 1996
filing date -
08/594,498
serial no -
Expired
status
Importance
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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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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,553,161 Upstream data packet time slot synchronization with downstream VBI for two-way CATV system | 72 | 1984 | |
| 5,231,665 Cable television system having dynamic market code shuffling | 63 | 1991 | |
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| 5,483,277 Simplified set-top converter for broadband switched network | 75 | 1992 | |
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| 5,512,934 System and method for transmission of programming on demand | 53 | 1994 | |
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| 5,528,582 Network apparatus and method for providing two way broadband communications | 134 | 1994 | |
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| 5,371,535 Multiplexing transmission apparatus for image signal and multiplexing system | 21 | 1993 | |
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| 5,412,720 Interactive home information system | 241 | 1992 | |
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| 5,541,757 Optical fiber cable service system provided with video on demand service | 32 | 1994 | |
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| 5,361,394 Upstream signal control apparatus for cable television system | 21 | 1992 | |
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| 4,975,771 Method and apparatus for TV broadcasting | 126 | 1989 | |
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| 5,177,604 Interactive television and data transmission system | 184 | 1988 | |
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| 5,606,725 Broadband network having an upstream power transmission level that is dynamically adjusted as a function of the bit error rate | 81 | 1994 | |