The present invention relates to an apparatus and method capable of detecting
a heartbeat using a photoplethysmography (PPG) even under a motion of a user. A
primary object of the present invention is to allow the heartbeat of the user to
be effectively detected from a PPG signal even under the motion. The object of
the present invention is accomplished by the following process of acquiring the
PPG signal from the user through a PPG sensor unit, detecting candidate heartbeat
sequences from the PPG signal after calculating an expected mean interbeat interval
through a signal processing technique based on the wavelet transformation and an
autocorrelation function, and extracting an optimal heartbeat sequence or mean
heart rate from the candidate heartbeat sequences.
