Signal converter circuit for color TV

Facsimile and static presentation processing – Static presentation processing – Attribute control

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H04N 942

Patent

active

045689636

ABSTRACT:
A signal converter for a color TV is used for converting a signal of the NTSC system, in which a subcarrier is quadrature-modulated by two chroma signal components, to a signal of the PAL system, in which a subcarrier is quadrature-modulated by two chroma signal components one of which two chroma signal components is inverted for each successive line, or vice versa. The signal converter includes a signal input terminal which receives an original signal having chroma signal components which are quadrature-modulated on a subcarrier having a frequency f1, a signal output terminal for producing a converted signal having chroma signal components which are quadrature-modulated on a subcarrier having a frequency f2 (where f1.noteq.f2), a first signal generator for generating a first continuous wave signal having a frequency equal to a difference between the frequencies f1 and f2, a second signal generator for generating a second continuous wave signal having a frequency equal to a sum of the frequencies f1 and f2, a modulator for producing a first modulated signal by multiplying a signal corresponding to the original signal received by the signal input terminal by the first continuous wave signal and for producing a second modulated signal by multiplying the signal corresponding to said original signal by the second continuous wave signal, a line changeover switch for alternately switching between the first and second modulated signals from the modulator for each successive line, and for supplying a selected signal to a signal transmission line coupled to the signal output terminal, and a filter interposed between the signal output terminal and the modulator, for extracting the chroma signal components to be produced from the signal output terminal from the first and second modulated signals.

REFERENCES:
patent: 4314273 (1982-02-01), Amery

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