| 摘要 |
A circuit for separating a PAL color television signal into a luminance signal and color difference signals. The PAL color television signal is sampled (2) in phase coinciding with color burst and at a sampling frequency four times as high as that of chrominance subcarrier. A part of the sampled signal is delayed for one frame by a frame memory (4), and difference between the sampled signal and the one-frame delayed signal is determined by a subtraction circuit (6). The one-frame difference signal is then divided into first and second inter-frame difference signals (b). From the first inter-frame difference signal (b1), motion information is detected by a detector (8) for controlling a mixing ratio of a mixer circuit (9) serving for mixing the second inter-frame difference signal (b2) and an interline difference signal (a). From the output of the mixer circuit, chrominance signal is demodulated (10) for every other pixel and interpolated (11) for the interposed pixels to obtain the color difference signals.
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