Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-02-10
1986-01-28
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 1700
Patent
active
045675201
ABSTRACT:
A television circuit arrangement for determining in a video signal (VS), frame periods comprising two field periods when a picture signal repeated in cycles of two successive field periods and with a possible change of picture content therebetween is present. Signal sources, such as, for example, cine-film television converters and "field skip" signal storage- and display devices, supply such a signal. It may be required for signal processing operations improving the picture quality during display, to use the cycles as frame periods. For this purpose, the circuit arrangement is provided with a switching circuit (S1-S6), a first (C1,S1,S4) and a second signal integration circuit (C2,S2,S5) which can be reset and are alternately operative every other field period, and a succeeding signal comparison circuit (AMP,S6) for supplying a voltage (VV) determining the frame period.
REFERENCES:
patent: 3485950 (1969-12-01), Reiser
patent: 3886589 (1975-05-01), Nasu
patent: 4145713 (1979-03-01), White
"Journal of the SMPTE"; Pearson et al.; vol. 82, #1, Jan. '73, pp. 17-21.
Briody Thomas A.
Britton Howard W.
Goodman Edward W.
Kostak Victor R.
Streeter William J.
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