| 摘要 |
<p>The circuit for demodulating a quadrature modulated and digitalised colour television signal has an inter frame comb filter with a delay section (1) having a delay time of at least one image element. This is between an adding stage (2) for the luminance channel and a subtracting stage (3) for the chrominance channel. An intraframe comb filter has a delay device (5) with a delay time of at least one line. A detector gives a switching signal for inter frame and intraframe demodulation when the image moves. This has a subtracting stage (6) for an intraframe comb filter for the luminance channel, which separates the residual colour carrier when the image moves. A bandpass (8) filters out this residual colour carrier. An envelope curve modulator has a gate pulse generator (9) for converting this residual colour carrier from inter frame to intraframe demodulation.</p> |
