| 摘要 |
In a collision preventing device using ultrasonic wave, with an ultrawave generating circuit, an ultrasonic receiving circuit, a central processing unit, and an alarm device, including an ultrawave generating circuit, an ultrasonic wave generating clock part, an ultrawave control signal part, an ultrasonic generation sensor, an ultrasonic wave receiving part, a first amplifying part, a bandpass filter, a second amplifying part, a detecting circuit part, a comparing circuit part, a reference time operating circuit part, a time comparator, and a signal control/processing part.
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