EP0519320A2
Expired / Lapsed
EP
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Video theater system and copy preventive method
Assignee: Panasonic Holdings Corp
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Filing: 1992-06-11
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Granted: —
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Expires: 2012-06-11
Abstract
Abstract A video theater system includes a video cassette recording at least a component video signal to which a copy preventive scheme has been applied; a video cassette recorder for reproducing the video cassette; a tuner (11) and an antenna (10) for receiving a signal transmitted via a satellite; a controller device (9) for controlling the video cassette recorder and the tuner; means for releasing the copy preventive scheme; and a projector (13) for projecting a video image from which the copy preventive scheme has been released. The copy preventive scheme is applied, while at least a synchronizing signal is retained, to a protected video signal at a point between dubbing of the master tape to the distribution tape after a video conversion and the second video cassette recorder. This copy preventive scheme is released by means of a device and circuit following a video cassette recorder used to reproduce the video signal in readiness for the projection thereof onto a screen.
Inventors
- 👤 Takayuki Kimoto
- 👤 Toshimitsu Fujimori
- 👤 Toshikatsu Kawakami
- 👤 Tatsuhiro Hosokawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 08:05
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N2005/91357; H04N2005/91364
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
In a video theater system comprising a video converter for photoelectrically converting a movies film and for applying a color correction, a master video cassette recorder for producing a master tape from a signal outputted from the video converter, a first video cassette recorder for duplicating the master tape to produce at least one distribution tape, a second video cassette recorder that plays back the distribution tape, a controller, and a projection means, a copy preventive system comprising: means for applying a copy preventive scheme, while at least a synchronizing signal is retained, to a protected video signal at a point between dubbing of the master tape to the distribution tape after a video conversion and the second video cassette recorder, and for releasing the copying preventive scheme by means of a device and circuit following the second video cassette recorder.
Claim 2
Dependent Claim
28 words
The system as claimed in Claim 1, wherein the copy preventive scheme is applied before the color correction or after the color correction in the video conversion process.
Claim 3
Dependent Claim
30 words
The system as claimed in Claim 1, wherein the copy preventive scheme is released in the projector means used to project a final normal video image or in a display.
Claim 4
Dependent Claim
31 words
The system as claimed in Claim 1, wherein the copy preventive scheme is released in a selector or controller to which the output of the second video cassette recorder is inputted.
Claim 5
Dependent Claim
32 words
The system as claimed in Claim 1, wherein the video signal from the master tape after video conversion to the second video cassette recorder is transmitted by means of a component signal.
Claim 6
Dependent Claim
107 words
A copy preventive method for a video theater system which comprises a video converter for photoelectrically converting a movies film and for applying a color correction, a master video cassette recorder for producing a master tape from a signal outputted from the video converter, a first video cassette recorder for duplicating the master tape to produce at least one distribution tape, a second video cassette recorder that plays back the distribution tape, a controller, and a projection means, said method comprising the step of scrambling a video signal by at least either line permutation or polarity inversion while maintaining a synchronizing signal in the scrambled video signal.
Claim 7
Dependent Claim
23 words
The method as claimed in Claim 6, wherein line permutation scrambled information is transmitted during a blanking period of a vertical synchronizing signal.
Claim 8
Dependent Claim
83 words
A video theater system comprising: a video cassette recording at least a component video signal to which a copy preventive scheme has been applied; a video cassette recorder for reproducing the video cassette; a tuner and an antenna for receiving a signal transmitted via a satellite; a controller device for controlling the video cassette recorder and the tuner; means for releasing the copy preventive scheme; and a projector means for projecting a video image from which the copy preventive scheme has been released.
Claim 9
Dependent Claim
37 words
The system as claimed in Claim 8, therein a process of applying the copy preventive scheme to the video cassette is a video scrambling process based on either a line rotation method or a line permutation method.
Claim 10
Dependent Claim
35 words
The system as claimed in Claim 8, wherein a process of applying the copy preventive scheme to the video cassette is the same as a scrambling method employed in the signal received from the satellite.
Claim 11
Dependent Claim
91 words
A controller used in a video theater system, which comprises: a first input terminal to which an output signal reproduced from a video cassette having recorded therein at least a video signal which has been scrambled is applied; a second input terminal to which signals transmitted from an antenna for receipt of a signal transmitted via a satellite and a tuner are applied: and a descrambling device for selecting one of the signals inputted respectively to the first and second input terminals and descrambling an output signal which has been selected.
References Cited (Backward Citations)
No citation records indexed.
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