| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption while keeping the detection performance of a moving body. SOLUTION: When a binary signal (Doppler signal) output from a comparator 9 is taken out of an input port of a detecting circuit 8 (microcomputer), for example, a low level Doppler signal is input continuously for a predetermined time or longer, the detecting circuit 8 determines that the moving body O exists in a monitored space and outputs a detection signal. Thus, the analog Doppler signal is converted into a digital signal (binary signal) with the comparator 9, so that the power consumption can be reduced because the A/D conversion is not required to be performed by the detecting circuit 8, and the reduction of the power consumption allows continuous operation, thereby keeping the detection performance. COPYRIGHT: (C)2007,JPO&INPIT
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