| 摘要 |
PURPOSE:To improve a resolution by automatically controlling a frequency of a frequency modulating luminance signal so as to interpose a frequency component interfering a frequency range of a low frequency conversion chromaticity signal into a space of frequency spectrum of the low frequency conversion chromaticity signal. CONSTITUTION:An output of an integrating circuit 24 is added to a filter output of a low pass filter circuit 7 in an adder 25, and fed back to a modulating input of an FM modulator 8. Therefore, the modulated output of the FM modulator 8 has a frequency component interfering with an occupying band of a low range conversion chromaticity signal of a lower sideband wave, which is constantly interposed into a space of a frequency spectrum of the low range conversion chromaticity signal. An automatic frequency control is carried out with respect to a frequency modulating luminance signal by an automatic frequency control circuit 22 so as to constantly interpose the lowersideband wave into the space of the frequency band of the low range conversion chromaticity signal. Accordingly, even when the frequency band of the lower side band of the the frequency modulating luminance signal is overlapped on the frequency band of the low frequency conversion chromaticity signal, a beat failure based on the interference of the luminance signal and the chromaticity signal is not produced frequency modulating luminance signal can be widened in band.
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