| 摘要 |
PURPOSE:To transmit the main signal and the sub-signal simultaneously to utilize the transmission line effectively, by superposing the sub-signal consisting of the digital signal onto the idle time slot of the main signal and by transmitting them. CONSTITUTION:The signal obtained by inputting the sub-signal and the clock signal to AND circuit 4 and the main signal are input to OR circuit 5, and the sub-signal consisting of the digital signal is superposed onto the idle time slot of the main signal, and they are transmitted from transmission unit 6 to receiving unit 8 through transmission line 7. The signal received by receiving unit 8 is input to timing extracting circuit 9 and flip-flop 11. Timing signal components are extracted from the receiving signal by timing extracting circuit 9, and the clock signal for main signal discrimination and the clock for sub-signal discrimination which is the inverted signal of the clock signal above are output to flip-flops 11 and 12. |
