DEVICE FOR RECOGNIZING OPEN/CLOSE OPERATION OF OPEN/CLOSE MEMBER AND METHOD FOR RECOGNIZING OPEN/CLOSE OPERATION OF OPEN/CLOSE MEMBER

摘要

A sensor microphone (10) senses a sound pressure.  An amplifier circuit (20) amplifies the sensed signal.  A filter circuit (30) filters the signal amplified through the amplifier circuit (20).  Further, an A/D converter (40) converts an analog signal obtained after passing through the filter circuit (30) to a digital signal, by use of which a signal discriminator (100) determines the presence or absence of an open/close operation of an open/close member.  The determined result is outputted through an output controller (50) to the outside.  This makes it possible to accurately detect the open/close of a door or the like without installing a special sensor at the door or the like.