Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-08-11
1981-12-01
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, 358153, 3581286, 360 36, H04N 513
Patent
active
043039391
ABSTRACT:
Horizontal synchronizing pulses are separated from a composite video signal and applied to a detector for producing an error signal representative of the timebase error of each pulse relative to a timebase reference having a period of approximately one horizontal line. Changes in the error signal are inhibited when the time period between pulses differs substantially from one line. Peak values of a given frequency component of the error signal are detected and averaged to provide an output signal manifestation representative of the frequency, amplitude and grouping of the timebase errors and which is relatively unbiased by pulses having a period substantially different from the period of the timebase reference. The apparatus may be used, illustratively, for quality control purposes and timebase error source identification in video disc mastering, replication and playback apparatus as well as for measurement of the effectiveness of timebase correction apparatus.
REFERENCES:
patent: 3829612 (1974-08-01), Beyers, Jr.
patent: 3940556 (1976-02-01), Boltz, Jr.
patent: 4158857 (1979-06-01), Hiraguri
Stephens Joseph W.
Yang Kou-Jay
Coalter R. G.
Martin John C.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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