LEFT-BEHIND DETECTION METHOD, LEFT-BEHIND DETECTION DEVICE, AND PROGRAM

摘要

The objective of the invention is to detect an infant left behind in an automobile, without installing a dedicated sensor. A microphone (M1) installed in an automobile collects acoustic signals. An autocorrelation unit (11) obtains an autocorrelation function from acoustic signals. A peak detection unit (12) detects the time at an autocorrelation value peak as a pitch period. An inverse number calculation unit (13) calculates the inverse number of the peak period as a pitch frequency. The pitch determination unit (21) determines whether or not the pitch frequency is included in a predetermined frequency band.