AC line triggered refreshing of CRT displays

Details AC line triggered refreshing of CRT displays AC line triggered refreshing of CRT displays

1975-05-09

1977-03-15

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340324AD, H04N 504, G08B 2300

Patent

active

040125920

ABSTRACT:
The disclosure describes a digitally controlled raster scan display system comprising a video signal generator that is automatically synchronized with the frequency of the a.c. power line from which it is powered to prevent line frequency beating. The display system also comprises a raster scan display generating a video display in response to signals from the video signal generator while needing no synchronizing circuits such as a phase lock loop.

REFERENCES:
patent: 3643252 (1972-02-01), Roberts, Jr.
patent: 3671957 (1972-06-01), Kegelman et al.
patent: 3685039 (1972-08-01), Flanagan
patent: 3750133 (1973-07-01), Helbig et al.
patent: 3803584 (1974-04-01), Hittel
patent: 3916402 (1975-10-01), Hornung
patent: 3918039 (1975-11-01), Clark

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