Cryptography – Key management – Having particular key generator
Patent
1986-02-24
1989-05-02
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 17, H04N 7167
Patent
active
048275107
ABSTRACT:
A method and related apparatus for selectively line spin scrambling, reversing and inverting certain video lines or video segments to minimize amplitude gaps in a line-spin scrambled video signal and for unscrambling the line-spin scrambled video signal. The method for minimizing the amplitude gaps in the line-spin scrambled video signal involves measuring various amplitude differentials, prior to line spin scrambling, between certain points along the active portion of each video line. The values of the various amplitude differentials are then compared to a preselected value and, depending on which amplitude differential is less than or equal to the preselected value, the video line is line spin scrambled, reversed or left unchanged and one of the video segments is inverted or reversed to reduce the amplitude gap in the scrambled video line to at least the preselected value.
REFERENCES:
patent: 4070693 (1978-01-01), Shutterly
patent: 4575754 (1986-03-01), Zohar
patent: 4605961 (1986-08-01), Frederiksen
patent: 4633310 (1986-12-01), Gautier
patent: 4663659 (1987-05-01), Blatter
Voigt Du Monte O.
Walker Robert H.
Yeiser Andrea L.
Buczinski Stephen C.
Goldstein Sol L.
Heal Noel F.
TRW Inc.
Wallace Linda J.
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