| 摘要 |
PURPOSE:To clearly recognize whether a signal under reception is a scramble signal or not, in the receiver which can receive the scramble signal. CONSTITUTION:The received scramble signal is supplied to a scramble decoder 16 and a BPF 4. In the scramble decoder 16, a video signal is extracted and this is detected by a decoder output detection circuit 17. The output of this detection circuit 17 is supplied to a control microcomputer 15 and here, it is judged whether the power source of the scramble decoder 16 is turned on or not. In the BPF 4, an audio signal is extracted and the control microcomputer 15 analyzes scramble information contained in this audio signal and judges whether the received signal is scrambled or not. Since the control microcomputer 15 controls a signal distinguishment information generating circuit 18 according to these judged results, and information showing whether the signal under reception is the scramble signal or not is generated and displayed on the screen of a CRT 7. |
