Method and apparatus for scrambling/descrambling a video signal

Details Method and apparatus for scrambling/descrambling a video signal Method and apparatus for scrambling/descrambling a video signal

1991-04-30

1993-01-05

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 14, 380 49, 380 50, H04N 7167

Patent

active

051777860

ABSTRACT:
A method and an apparatus for scrambling and descrambling a composite video signal. The method comprises the steps of multiplying a digitalized composite video signal by a transform matrix of a predetermined format in order to bit-scramble them and multiplying the bit-scrambled signals by a matrix of the reverse of said predetermined format to descramble them into original composite video signals. The apparatus comprises a plurality of multiplexers adapted to scramble and descramble the digitized composite video signal in response to external select signals. The external select signals which are applied to the multiplexers of a descrambler 2'S complement signals of signals applied to multiplexers in a scrambler. According to the present method and apparatus, it is possible to prevent any deterioration of the image quality, increase of cost, and illegal watching by non-subscribers.

REFERENCES:
patent: 3958077 (1976-05-01), Ross et al.
patent: 4531024 (1985-07-01), Colton et al.
patent: 4776013 (1988-10-01), Kafri et al.
patent: 4821321 (1989-04-01), Bramley

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