Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-06-04
1976-06-15
Safourek, Benedict V.
Telegraphy
Systems
Simplex-reversing periodic
178 51, 178 695TV, 360 37, 179 15E, H04N 316, H04N 144, H04M 170, H04N 578
Patent
active
039638650
ABSTRACT:
There is disclosed herein a method and system for eliminating or deterring the unauthorized duplication or piracy of video program material, including video tape, cable and broadcast television material. A composite video signal is encoded when recording, or upon broadcast by wire or cable, for preventing unauthorized duplication of the video material and without the need for scramblers and unscramblers. The encoding method allows normal playback of the video material on a conventional television receiver or monitor, but prevents the video material from being effectively re-recorded or duplicated on any of a number of commercially available video recorders by eliminating or distorting the video image upon playback of the re-recording to thereby destroy its commercial value. No decoder or unscrambler is required at the television receiver or monitor for normal playback of the encoded video signals. The method and system involve changing the vertical interval of the video signal prior to recording or transmission. In a preferred form, a displacement is introduced in the NTSC vertical synchronizing interval in the area of the vertical serrates at a point therein which allows sufficient pulse information for integration in the operation of normal television receiver vertical circuitry, but insufficient pulse information for operation of vertical circuits of various formats of video tape recorders.
REFERENCES:
patent: 3180929 (1965-04-01), Hibbard et al.
patent: 3335218 (1967-08-01), Johnson
patent: 3460161 (1969-08-01), Waller et al.
patent: 3530232 (1970-09-01), Reiter et al.
patent: 3717206 (1973-02-01), Zopf et al.
patent: 3837003 (1974-09-01), Justice
Godfrey R. John
Safourek Benedict V.
Trans-American Video, Inc.
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