Apparatus for scrambling a television signal

Details Apparatus for scrambling a television signal Apparatus for scrambling a television signal

1986-08-25

1987-10-13

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, 380 17, 380 21, H04N 7167, H04L 902

Patent

active

047003880

ABSTRACT:
An apparatus for scrambling or encoding a television signal by inverting the latter signal in accordance with a control signal having a predetermined code pattern comprises a detector circuit for detecting a change in a picture scene of the television signal and generating an identification signal in response to detection of the scene change and code generator for generating a key code signal of specific pattern which indicates a particular program of the television signal. According to this invention, the control signal is formed in response to both the identification signal and the key code signal.

REFERENCES:
patent: 4075660 (1978-02-01), Horowitz
patent: 4340906 (1982-07-01), den Toonder et al.
patent: 4484027 (1984-11-01), Lee et al.
patent: 4514761 (1985-04-01), Merrell et al.
patent: 4533949 (1985-08-01), Fujimura et al.

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