REPRODUCING DEVICE FOR PAL SYSTEM COLOR VIDEO SIGNAL

PURPOSE:To simplify the circuit constitution by using a frequency converting circuit applying high frequency conversion to a low frequency conversion chrominance carrier signal in a color video signal to PAL system and restoring it into the original chrominance carrier signal in common use with a fr...

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Bibliographische Detailangaben
Hauptverfasser: YOSHIDA SHOJI, TADAMI MITSUSHIGE
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:PURPOSE:To simplify the circuit constitution by using a frequency converting circuit applying high frequency conversion to a low frequency conversion chrominance carrier signal in a color video signal to PAL system and restoring it into the original chrominance carrier signal in common use with a frequency converting circuit obtaining the polarity of the V axis signal of the obtained chrominance carrier signal and the inverted polarity. CONSTITUTION:The low frequency conversion carrier chrominance signal in the color video signal of the PAL system reproduced by the 1st and 2nd frequency conversion circuits 45, 53 is subject to high frequency conversion and restored into the original chrominance carrier signal and the V axis signal component with the original polarity and the inverted polarity of the chrominance carrier signal obtained through high frequency conversion are obtained. Thus, it is possible to replace frequency conversion circuit in a conventional VTR into noninverting and inverting frequency converting circuits 71, 72 and the C signal processing is attained with very simple processing by using a signal being the result of 1/4 frequency division of the output of the clock signal generating circuit 64 with the use of 4fsc clock signal.