| 摘要 |
PURPOSE:To enable to perform required and sufficient equalization at all times during video signal period, by setting most suited equalizing condition through the use of BPF changing the center frequency. CONSTITUTION:The BPF 104 picks up the frequency f1 from the transmission side and converts it into a DC voltage, and BPF 105 picks up the frequency f2 component from the transmission side and converts it into a DC voltage. The potential difference between the output voltage of BPF 104 and that of BPF 105 is outputted from the differential amplifier 108, the output voltage is held, and the control signal of BPF 101 is outputted from the hold circuit 109 for a given period. Thus, the frequency f1 and f2 components fed from the transmission side during the training period before the video signal period determine the center frequency of BPF 101 to set the most suited condition of equalization, allowing to perform equalization required and sufficient at all times during the video signal period. |
