Power line synchronization of CRT raster scan

Details Power line synchronization of CRT raster scan Power line synchronization of CRT raster scan

1976-02-19

1979-05-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340814, 331 21, H04N 506, G06K 1520

Patent

active

041562542

ABSTRACT:
In a cathode ray tube (CRT) display system using a horizontal line raster scan, the vertical sync signals are derived from the power line alternating current while the vertical blanking signals to blank the vertical retraces between rasters are timed to occur over an interval which starts before a vertical sync signal and ends a period of time after the vertical sync signal which is no less than the minimum time required for a vertical retrace.

REFERENCES:
patent: 3006995 (1961-10-01), Fathauer
patent: 3526715 (1970-09-01), Cagle et al.
patent: 3598911 (1971-08-01), Helbig
patent: 3777063 (1973-12-01), Meacham
patent: 3916402 (1975-10-01), Hornung
patent: 4012592 (1977-03-01), Ricard
Kiver, Television Simplified, Van Nostrand, 1973, p. 313.

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