Method of and apparatus for scrambling a video signal with full

Details Method of and apparatus for scrambling a video signal with full Method of and apparatus for scrambling a video signal with full

1994-08-09

1996-12-31

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 3, 380 10, 358296, 358446, 360 60, H04N 7167

Patent

active

055901948

ABSTRACT:
A video scrambling and descrambling system that produces color video that is difficult or annoying to watch by randomly switching the color components of a component or composite video. In the scrambling portion, component or composite video is decoded into a luminance component and its two color components. A random switching signal is generated to randomly switch the relationship of the color component signals. The randomly switched color component signals may be encoded together with the luminance signal to produce a component or composite video signal that is scrambled. The random switching signal may be transmitted as part of the encoded signal or through a separate data channel medium. A descrambling portion first separates the scrambled component or composite video signal into a luminance component and two scrambled color components. The random switching signal transmitted to the descrambler along with the scrambled video signal is used to restore the original relationship between the color component signals. The luminance component as well as the two descrambled color components are then encoded to produce a component or composite video with the relationship between the color components restored to their respective original positions in the video signal. The method may be used in various transmission and recording formats.

REFERENCES:
patent: 4307416 (1981-12-01), Spano
patent: 4620224 (1986-10-01), Lee et al.
patent: 4642688 (1987-02-01), Lowry et al.
patent: 5113439 (1992-05-01), Hashimoto

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