| 摘要 |
<p>PURPOSE:To simplify work without drawing the wiring of an alarm in a room by multiplying the high frequency signal of an oscillation means, modulating a multiplication signal by a detection signal, and transmitting it to an alarm means in an automobile via an antenna. CONSTITUTION:The high frequency signal oscillated at an oscillator 1 is multi plied by two or three with a frequency multiplication amplifier 12, and is ampli fied with an intermediate amplifier 13. The high frequency signal is further amplified with a power amplifier 14, and is transmitted to an analog switch 18. When no body 9 to be detected approaches a sensor 3, no control signal is output from a oscillator 1, therefore, a switch 18 is turned off. When the body 9 approaches the sensor 3, the control signal is outputted from the discrimi nator 11, therefore, a controller 17 is operated, and the switch 18 is turned on. Thereby, a voice output circuit 15 is operated, and voice output is sent to a modulator 16, and modulation is applied to the high frequency signal. The output of the amplifier 14 is sent to a transmission antenna 19, and alarm output is transmitted.</p> |
