| 摘要 |
PURPOSE:To realize the video signal reproducing unit with simple constitution and low cost, by independently picking up the chroma signal with the C type comb type filter means and the luminance signal with the Y type comb type filter means. CONSTITUTION:The output signal from the pickup unit 1 is fed to the FM demodulator 3 to reproduce the original signal and feed input to the modulator 4, and the signal from the voltage controlled oscillator VCO 5 is uni-balancing-modulated 4 to pick up the signal of chroma signal band with BPF 9. After that, the chroma component only is picked up at the C type comb type filter circuit consisting of the one line delay line 12 and the subtraction circuit 13. This signal is fed to the subtraction circuit 16 and it is subtracted with the signal from the residual side band wave filter 8 thrugh the delay circuit 15 to obtain the luminance signal. This signal is added wth the chroma signal through the delay circuit 14 at the addition circuit 19 to obtain the standard television signal of NTSC system. |
