Vertical interval data blanker

Details Vertical interval data blanker Vertical interval data blanker

1986-04-10

1987-09-01

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 20, 380 10, H04N 7167

Patent

active

046913548

ABSTRACT:
A stretched vertical interval pulse is developed by a transistorized integrating circuit supplied with a composite sync signal applied to a data recovery and unscrambler circuit in a television decoder. The decoder includes a pair of transmission gates that are controlled respectively by VNX and VIX signals developed in the unscrambler circuit. The VNX signal is supplied through an OR gate to the normal transmission gate and the output of the vertical interval pulse stretcher is applied to the other input of the OR gate for delaying cutoff of the transmission gate by the VNX signal until occurrence of horizontal line 10, thus precluding blanking of post equalizing pulses.

REFERENCES:
patent: 4336554 (1982-06-01), Okada et al.
patent: 4408225 (1983-10-01), Ensinger et al.
patent: 4488183 (1984-12-01), Kinjo

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