TD multiplexing digital video signals with scramble of scramblin

Details TD multiplexing digital video signals with scramble of scramblin TD multiplexing digital video signals with scramble of scramblin

1997-04-07

2000-02-22

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 9, 380 50, H04N 7167, H04K 102, H04L 900

Patent

active

060289341

ABSTRACT:
For supply to a time division multiplexer for multiplexing a predetermined number of digital multiplexer input signals bit by bit into a multiplexed signal in which a long pathological pattern is suppressed and which is supplied preferably to an optical network. A parallel scrambler subjects a plurality of digital video signals to scrambling of a prescribed number of scrambling stages with the prescribed number selected greater than the predetermined number. Produced by the scrambler, scrambled signals, equal in number to the digital video signals, are used in the digital multiplexer input signals preferably with an inverter used to invert one of the scrambled signals so that the predetermined number is equal to one plus the plurality.

REFERENCES:
patent: 4807290 (1989-02-01), Pospischil
patent: 5185799 (1993-02-01), McNesby et al.
patent: 5355415 (1994-10-01), Lee et al.
patent: 5574717 (1996-11-01), Tomizawa et al.
Kajitani et al., "Video signal distribution system for broadcasting station utilizing photonic wavelength-division and time-division hybrid multiplexed network", Opto-Electronics Res., pp. 39-46, Mar. 15, 1991.
Choi, "Parallel scrambling techniques for digital multiplexers", AT&T Technical Journal, pp. 123-136.

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