Video encription system

Details Video encription system Video encription system

1973-07-26

1976-09-21

Wilbur, Maynard R.

Telegraphy

Systems

Simplex-reversing periodic

325 60, 325138, H04N 144

Patent

active

039820629

ABSTRACT:
Encription apparatus for restricting distribution of private (e.g., premium) video programs propagated by a CATV cable network, radiation or the like employs picture carrier isolating, phase shifting and linear combining structure for rendering the transmitted video information unrecoverable by conventional television receivers. Authorized receiving stations are provided with inversely functioning electronics which reconstitute the prescribed video amplitude modulation format to permit signal reception. Similar audio program modification and correction structure permits encription and selective reception of the sound portion of the distributed programming.

REFERENCES:
patent: 1258548 (1918-03-01), Englund
patent: 2173156 (1939-09-01), Beverage
patent: 3081376 (1963-03-01), Loughlin et al.
patent: 3084329 (1963-04-01), Clay
patent: 3353099 (1967-11-01), Hayasi et al.

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