Secure video distribution system

Details Secure video distribution system Secure video distribution system

1987-12-30

1989-06-20

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 8, 455 1, H04N 7167, H04K 300

Patent

active

048415693

ABSTRACT:
A video distribution system (e.g., CATV or MATV) employs at least one channel having a reception-defeating jamming signal which changes frequency periodically or, preferably, randomly. The signal originating head end distributes information characterizing the operative frequency of the jamming wave.
At controller apparatus for authorized viewers, the jamming frequency specifying data is employed on a frequency agile basis of heterodyne the protected channel into a proper (fixed) frequency relationship with a notch band suppression filter to remove the jamming signal. The secure channel with the jamming wave removed is then again shifted to its original or other intended frequency to permit normal reception either directly by a standard television receiver, or via a frequency converter.

REFERENCES:
patent: 3175033 (1965-03-01), Blonder et al.
patent: 3202758 (1965-08-01), Brownstein
patent: 3347982 (1967-10-01), Bass et al.
patent: 3760097 (1973-09-01), Burroughs et al.
patent: 3896262 (1975-07-01), Hudspeth et al.
patent: 4074311 (1978-02-01), Tanner et al.
patent: 4623918 (1986-11-01), Chomet

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