Body detecting device

摘要

A device for detecting a body comprises transmitter means, receiver means for receiving the signal from the transmitter means, means for setting the level of a reference signal by the reception signal from the receiver means provided when the body is in a reference condition, to correct the reference signal, which reference signal provides a reference for identifying the reception signal, and comparator means for identifying the reception signal in accordance with the reference level connected to the reference level setting means. The body detecting device effects the detection by the output of the comparator means.