| 摘要 |
PURPOSE:To decrease the correspondence time with much noise by applying arithmetic means to a reply signal so as to detect it and using a synchronizing signal as a terminal selection signal so as to inject the signal repetitively. CONSTITUTION:When no replay comes from a terminal equipment, a repeater injects repetitively a synchronizing signal 5 and an address signal 6. When the terminal equipment detects the synchronizing signal 5, the address signal 6 is detected by arithmetic mean and when an address represented by the address signal 6 is coincident with the address of the terminal equipment, at first a reply synchronizing signal 7 is injected. If no reply signal 8 is detected due to noise, the undetectable reply signal 8 is stored and the synchronizing signal 5 is injected again. In receiving the reply signal responding thereto, the previous stored signal 8 and the current replay signal 8 are subjected to arithmetic means to detect the signal. Since the random noise component is decreased by the arithmetic means, the signal detection is facilitated.
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