| 摘要 |
PURPOSE:To simplify a processing circuit and to decrease a cost by taking out the first and second CW signals from a variable control oscillating circuit for a PAL color signal processing circuit and inputting a line successive signal after phase modulation to the above-mentioned circuit when the line successive signal of an SECAM color signal is phase-modulated by the first and second CW signals having a 90 deg. phase difference mutually. CONSTITUTION:The first CW signal C1 guided to an SECAM/PAL converting part SC and the second CW signal C2 to phase-advance this to 90 deg. are given to a phase modulating circuit 6 for PAL. Thus, at the output line L2 of the modulating circuit 6, the phase-modulated R-Y and B-Y line successive signal can be obtained. An output signal A after modulation is inputted to a band pass filter 15 in a PAL processing part PP, and the burst signal is removed by a gate circuit 16 and derived as a signal E. The signal E is inputted to a 1H delay circuit 17 and adder subtractor circuits 18 and 19. A B-Y signal and an R-Y signal demodulated respectively by demodulating circuits 20 and 21 are obtained and a G-Y signal is generated by a matrix circuit 22.
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