PAL switching control circuit

Details PAL switching control circuit PAL switching control circuit

1977-09-26

1979-04-03

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 18, 358 27, H04N 950

Patent

active

041480589

ABSTRACT:
In a PAL color television system for processing a color signal including burst and chrominance components alternating in phase at the image line scanning rate, identification and control circuitry for rapidly correcting an incorrect mode of line to line color demodulator switching. A bistable circuit generates timing signals for controlling line by line switching of a selected color demodulator (e.g., R-Y). An identification signal representative of an incorrect line switching mode is derived from information contained in the burst component, and serves to reset the bistable circuit such that timing signals corresponding to a correct switching mode are produced. The identification signal is derived by a filter circuit exhibiting a fast response time relative to the line scanning time, in order to rapidly respond to the switching mode identification information occurring at the line rate and thereby rapidly restore the correct demodulator switching mode.

REFERENCES:
patent: 3553357 (1971-01-01), Carnt
patent: 3588323 (1971-06-01), Krause
patent: 3740456 (1973-06-01), Harwood
patent: 3794754 (1974-02-01), Haferl
Motorola Corp., TBA 395 Integrated Circuit, Functional Description, receipt date Sep. 2, 1976.

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