Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-04-01
1992-11-10
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
328139, H04N 508
Patent
active
051629097
ABSTRACT:
Apparatus for separating sync and video includes a luminance signal coupling capacitor, a keyed clamp circuit coupled to a source of back porch keying pulses for clamping a back porch interval of the composite luminance signal to a reference direct voltage level, and signal clipping means comprising at least one voltage follower amplifier device and a threshold biasing semiconductor device of the same conductivity type as the voltage follower amplifier connected to the output electrode of the voltage follower, such that the biasing device maintains the voltage follower in cutoff conduction condition for signals of one polarity with respect to the reference voltage while producing a predetermined direct voltage output across a load resistance and for allowing coupling of signal components of opposite polarity with respect to the direct voltage level to a utilization device.
REFERENCES:
patent: 3881055 (1975-04-01), Gerot
patent: 4081833 (1978-03-01), Akiyama
patent: 4097896 (1978-06-01), Avery
patent: 4296437 (1981-10-01), Geurts
patent: 4424528 (1984-01-01), Karlock et al.
patent: 4489349 (1984-12-01), Okada
patent: 4628361 (1986-12-01), Andreas
Legler, Ernst: Verfahren zur Regelung von Videosigalen (Methods for the regulation of video sigtnals), In: Rundfunktechnische Mitteilungen 1963, pp. 21-24, with English translation.
Application note Sony CX20125 IC and accompanying translation.
Block diagram of the internal circuitry of the CX20125 IC.
Circuit schematic diagram of the CX20125 IC.
Lagoni William A.
Lineberry Roger L.
Emanuel Peter M.
Groody James J.
Harvey David E.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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