| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bidirectional remote control system with which levels for providing high level and low level transmission signals can be realized with a little components in extremely simple configuration. SOLUTION: This system is provided with a signal generating circuit 2 for generating transmission signals, a signal reception circuit 3 for receiving reaction signals, a transmission/reception signal switching circuit 1 connected to the signal generating circuit 2 and the signal reception circuit 3 for switching transmission/reception by turning on/off a switch element, a switch signal generating circuit 4 for supplying a transmission switch signal or reception switch signal to the switch element and antenna 5 shared for transmission and reception connected to the transmission/reception signal switching circuit 1. At the high level transmission of transmission signals, the transmission switch signal is supplied to the transmission/reception signal switching circuit 1, the transmission/reception signal switching circuit 1 is switched into signal transmitting state, and transmission signals are supplied to the antenna 5 with a low loss. At the low level transmission of transmission signals, the reception switch signal is supplied to the transmission/reception signal switching circuit 1, the transmission/ reception signal switching circuit 1 is switched into signal receiving state, and transmission signals are supplied to the antenna 5 in a state of applying a high loss.</p> |
