JPH02147987U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a basic block diagram of the Y/C separation circuit of the present invention, FIGS. 2 to 4 are block diagrams of the first to third embodiments of the circuit of the present invention, and FIG. 5 is a diagram of the conventional Y/C separation circuit. FIG. 2 is a block diagram of a Y/C separation circuit (comb filter). 1...Y/C separation circuit, 2...C separation circuit, 3
...1H delay circuit, 4, 5...Subtraction circuit, 6 to 8
...BPF, 9...delay circuit, 10...comb filter.

Claims (1)

[Scope of utility model registration request] In a Y/C separation circuit that separates a composite video signal, which is an input signal, into a luminance signal and a color signal, a color signal separation means separates a color signal component from the composite video signal, and a color signal separated by the separation means. luminance signal separation means for separating a luminance signal by subtracting the component from the composite video signal; A delay circuit that delays the input signal by one horizontal scanning period; and a subtraction circuit that subtracts the output of the delay circuit and the output or input signal of the first band waver; A second band wave whose pass band width of the device is approximately the same as a wider color signal frequency bandwidth among the color signal frequency bandwidths, and which passes a frequency band narrower than the pass band width of the first band wave device. Equipped with more equipment,
A Y/C separation circuit characterized in that the output of the subtraction circuit is supplied to the second bandpass filter and the obtained output is used as a color signal.