Scrambling video by time shifting

Details Scrambling video by time shifting Scrambling video by time shifting

1990-04-05

1991-03-26

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

380 12, 380 15, H04N 7167

Patent

active

050035924

ABSTRACT:
A system for scrambling and descrambling the image associated with a video signal employs the shifting in time of a video image after removal of synchronization and color burst reference signals. Coded data which contains information necessary for unscrambling the video image is transmitted in the video signal itself during the vertical blanking interval. A high level of simplification in the decoding is achieved by merely restoring synchronization and color reference data without the need for returning the video image to its original timing. This system provides the significant advantage of permitting unscrambling of the video image using inexpensive circuitry at the decoder end, while affording the operator of the transmitter to select whether the unscrambled signal is recordable using a conventional video tape recorder.

REFERENCES:
patent: 4594609 (1986-06-01), Romao et al.
patent: 4716588 (1987-12-01), Thompson et al.
patent: 4901349 (1990-02-01), Metzger et al.

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