| 摘要 |
PURPOSE:To obtain the same effect as a synchronous lock system dispensing with the system and further to obtain simplified and low-priced circuit configuration as well. CONSTITUTION:A received TV signal, on which a GCR signal is superimposed, is converted to a prescribed IF signal by a down converter 1, the pertinent IF signal is detected by a detection circuit 4 and a video signal is obtained. Concerning the video signal, the ghost component is removed by the GCR signal at a ghost removing circuit 9, the signal is modulated again by a modulator 5, and the modulated output is converted to the TV signal at the same frequency as that of the received TV signal by an up converter 6. The IF signal is branched by a branching circuit 13 and impressed to a high frequency divider 11. The signal component at the same frequency as that of the IF signal is obtained from the rectangular wave signal of the frequency divided output by a BPF 12, and the component is supplied to the modulator 5 as a carrier. |
