| 摘要 |
PURPOSE:To supply a scramble television signal and a non-scramble television signal to a modulator through one transmission line. CONSTITUTION:A low pass filter clamp circuit 14 applies processing of non- scramble television signal to an output signal of a reception demodulation section 12, and a scramble release circuit 16 applies scramble release processing to an output signal from the reception demodulation section 12. A changeover switch 28 selects one of outputs from the circuits 14, 16 and the reception demodulation section 12 and the selected output is fed to an output terminal 30. The changeover switch 28 gives an output of the reception demodulation section 12 to the output terminal 30 when an output of the reception demodulation section 12 is a scramble television signal and the scramble is not released, and the changeover switch 28 gives an output of the circuit 14 to the output terminal 30 when an output of the reception demodulation section 12 is a scramble television signal and the scramble is released, and the changeover switch 28 gives an output of the circuit 14 to the output terminal 30 when an output of the reception demodulation section 12 is a non-scramble television signal. |
