Patent ID: 11861998
Assignee: STMICROELECTRONICS S.R.L.
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. The method according to claim 15, wherein detecting, in the electrostatic charge variation signal, the characteristics that follow each other in temporal order includes:
calculating a first derivative signal of the electrostatic charge variation signal;
identifying, in the electrostatic charge variation signal and in the first derivative signal, a respective plurality of positive and negative peaks; and
detecting one of the following time series a) and b) with which said plurality of positive and negative peaks follow each other over time:
a) a first positive peak in the first derivative signal; a second positive peak in the electrostatic charge variation signal; a first negative peak in the first derivative signal; a second negative peak in the electrostatic charge variation signal; a third positive peak in the first derivative signal, and
b) a third negative peak in the first derivative signal; a fourth negative peak in the electrostatic charge variation signal; a fourth positive peak in the first derivative signal; a fifth positive peak in the electrostatic charge variation signal; a fifth negative peak in the first derivative signal.