Technique for toggling coding mode in a television signal encode

Details Technique for toggling coding mode in a television signal encode Technique for toggling coding mode in a television signal encode

1987-02-13

1988-07-19

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 10, H04N 7167

Patent

active

047590610

ABSTRACT:
A technique for toggling the coding mode in a television signal encoder comprises establishing a rectangular window defining a relatively small and substantially centrally located portion of the field image intervals of the television signal. The coding mode of the encoder is toggled whenever the APL of the television signal occurring during the window exhibits a change for successive video fields exceeding a predetermined threshold level.

REFERENCES:
patent: 4222068 (1980-09-01), Thompson
patent: 4308556 (1981-12-01), Osaka
patent: 4340906 (1982-07-01), den Toonder et al.
patent: 4369462 (1983-01-01), Tomizawa et al.
patent: 4447828 (1984-05-01), den Toonder
patent: 4454543 (1984-06-01), Lund et al.
patent: 4514761 (1985-04-01), Merrell et al.
patent: 4679235 (1987-07-01), Okada et al.

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