Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-11-02
1985-05-21
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358150, 328187, H04N 702, H04N 506
Patent
active
045189951
ABSTRACT:
A selectable rate sync generator system for use with a television test pattern generator includes a master oscillator of predetermined frequency, selector switches for selecting the desired total horizontal line time, and a horizontal line trigger circuit for generating a train of clock pulses having twice the repetition rate (2H) of the line time selected. H rate blanking and drive pulses are generated in response to the clock pulses. Selector switches are provided for selecting a desired number of horizontal scanning lines in two fields, and a vertical trigger circuit generates vertical trigger pulses having the repetition rate (V) of the number of lines selected. V rate blanking and drive pulses are generated in a response to the V trigger pulses, and the H and V rate blanking pulses are summed to provide a composite blanking signal. H rate sync pulses are generated in a response to the clock pulses and are delayed therefrom by a predetermined interval. V rate sync pulses are generated in a response to the V rate blanking pulses, and the H and V sync pulses are summed to provide a composite sync signal.
REFERENCES:
patent: 3359367 (1967-12-01), Hiatt, Jr.
patent: 3582963 (1971-06-01), Bennet
patent: 3777063 (1973-12-01), Meacham
patent: 4316219 (1982-02-01), Smith et al.
patent: 4417275 (1983-11-01), Harshbarger et al.
Harshbarger John H.
Shores William M.
Martin John C.
Peng John K.
Visual Information Institute, Inc.
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