| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bidirectional remote control system with which an oscillation circuit 5 to be used for a transmission part and a reception part is shared, the number of components is reduced or production costs are reduced and system miniaturization is attained. SOLUTION: This system is provided with a transmission part 1 composed of a modulation circuit 6 for generating a transmission signal modulated by a first operate signal and a high frequency power amplifier circuit 7 for amplifying the power of the transmission signal, a reception part 2 composed of a high frequency amplifier circuit 8 for amplifying a reception signal, a frequency mixer circuit 10 for converting the reception signal to an intermediate frequency(IF) signal, and a signal demodulation circuit 12 for reproducing a second operation signal by demodulating the amplified IF signal, and transmission/reception switching part 3 for connecting the transmission part 1 to a transmission/ reception sharing antenna 4 at the time of transmission and connecting the antenna 4 to the transmission part 1 upon reception, and an oscillation circuit 5 for supplying a signal to be modulated to the modulation circuit 6 is shared with a local oscillation circuit 5 for supplying a local oscillate signal to the frequency mixer circuit 10.</p> |
