An Analysis for Characteristics of Biosignal Abstracted from Piezoelectric Sensor

Increasing in the number of elderly single-person households causes lonely deaths and it is social problem. We study a watching system for elderly families by laying the piezoelectric sensors inside the house. There are few privacy issues of this system because piezoelectric sensor detects only person's vibration signal. Furthermore, it has a benefit of sensing ability for bio-signal including respiration cycle and cardiac cycle. We propose a method of identifying the person who is on the sensor by analyzing frequency spectrum of the bio-signal. This makes it possible to identify whether the person falling on the piezoelectric sensor is the elderly person or another family member or visitor.