| 摘要 |
PURPOSE:To supply an optionally restricted range from a remote place by receiving command signals in position relation within a desired range and transmitting them at specific timing by three transmitter and receivers, and detecting their concurrency by many movable receivers. CONSTITUTION:One transmitter 1 is arranged at a distant place, at least three transmitters 2 are arranged near some specific wide area, and many receivers 3 which move in the area arranged; the transmitter 1 transmits plural command signals while calculating a desired narrow range in the specific area, and the signals contain the identification signal, transmission timing signal, and other pulse width of the receivers 2. Those signals are received by the transmitter and receivers 2, which transmit a pulse signal with specific width to the receivers 3 at specified timing; and the receivers 3 detect the concurrency of the transmitted signals and display them when the concurrency is within a permissible range. |
