Process and circuit layout for the recognition of an identificat

Details Process and circuit layout for the recognition of an identificat Process and circuit layout for the recognition of an identificat

1988-09-29

1990-03-06

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 23, 358 84, 358 86, 455 2, 455 3, H04N 1700

Patent

active

049072692

ABSTRACT:
Circuitry for recognizing an authorization code included in a video signal for enabling a subscriber's television receiver, includes quantizing apparatus for coarsely quantizing the received signal. A correlator designed to recognize the authorization code is coupled the quantizer and produces an array of correlation values. The correlation values are coupled to a threshold circuit which converts the correlation values to bistate values. Further circuitry evaluates the distribution of bistate values to determine reception of the authorization code.

REFERENCES:
patent: 3838444 (1974-09-01), Loughlin et al.
patent: 4319273 (1982-03-01), Nossem
patent: 4620219 (1986-10-01), Burrowes

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