| 摘要 |
PURPOSE:To enable to receive various systems arbitrarily, by making the band of luminance signal system the same to that of NTSC system, doubling the subcarrier frequency of a chroma signal to that of NTSC system, making the band of chroma signal broad and switching various signal separation means and signal production means. CONSTITUTION:When a video signal of NTSC system is input to an input terminal 1, the switches SWa-SWc are switched, the 1st delay line 3 is connected to an amplifier 5, the 1st band filter and amplifier 6 is to a signal processing circuit 8, and the 1st demodulation oscillation circuit 9 is to the signal processing circuit 8, to use the system as a monitor color television receiver for NTSC. When the video signal of modified system is input to the input terminal 1, the switches SWa- SWc are switched to connect the 2nd delay line 4 to the amplifier 5, the 2nd band filter and amplifier 7 to the signal processing circuit 8 and the 2nd demodulation oscillation circuit 10 to the signal processing circuit 8. |
