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1. (WO1991009500) ENCODING AN OPTICAL VIDEO DISC TO INHIBIT VIDEO TAPE RECORDING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/009500 International Application No.: PCT/US1990/006927
Publication Date: 27.06.1991 International Filing Date: 28.11.1990
Chapter 2 Demand Filed: 09.07.1991
IPC:
H04N 5/913 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
5
Details of television systems
76
Television signal recording
91
Television signal processing therefor
913
for scrambling
Applicants:
EIDAK CORPORATION [US/US]; Four Cambridge Center Cambridge, MA 02142, US
Inventors:
LECHNER, Bernard, J.; US
STUBBS, Graham, S.; US
LEONARD, Eugene; US
Agent:
FROMMER, William, S.; Curtis, Morris & Safford 530 Fifth Avenue New York, NY 10036, US
Priority Data:
452,59918.12.1989US
Title (EN) ENCODING AN OPTICAL VIDEO DISC TO INHIBIT VIDEO TAPE RECORDING
(FR) CODAGE D'UN DISQUE VIDEO OPTIQUE EMPECHANT L'ENREGISTREMENT SUR BANDE VIDEO
Abstract:
(EN) A system and method for encoding an optional video disc to inhibit unauthorized recording of played back signals by conventional videotape recorders is provided. A source program is mounted on a video signal generating means (40). The video signal (41) is modified by increasing and decreasing time durations from a standard horizontal line duration of pre-established maximums and minimums (70). The modified video signal (71) is recorded on a previously blank optical video disc (13).
(FR) Système et procédé de codage d'un disque vidéo optique empêchant l'enregistrement non autorisé de signaux reproduits en utilisant des enregistreurs à bande vidéo classiques. Un programme source est monté sur des moyens générateurs de signaux vidéo (40). Le signal vidéo (41) est modifié en augmentant et en diminuant les durées à partir d'une durée standard de ligne horizontale de maxima et de minima pré-établis (70). Le signal vidéo modifié (71) est enregistré sur un disque vidéo optique vierge (13).
Designated States: JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0506824