Stmicroelectronics S.r.l.

Simone Ferri

Fabio Passaniti

To recognize an authorized user from an unauthorized user of a portable electronic apparatus, the portable electronic apparatus has a plurality of sensors and a user-recognition circuit. The sensors are each configured to generate a signal representative of a respective physical quantity associated with the use, by a user, of the portable electronic apparatus in an operating state. The user-recognition circuit is configured to receive a plurality of electrical signals from the plurality of sensors; determine a plurality of recognition parameters, each associated with a specific mode of use of the portable electronic apparatus by the user; determine a plurality of indicators of use, one for each recognition parameter, wherein each parameter indicates the probability that, at a time instant, the respective recognition parameter is associable with an unauthorized user; determine a probability of intrusion from the plurality of indicators of use; and compare the probability of intrusion with an intrusion threshold.

Recognition of unauthorized access of a portable electronic apparatus

The circuit includes, upstream from a PWM quantizer, that is between the output of the sigma-delta modulator and the input of the PWM or PWM-like quantizer, a second or ancillary sigma-delta stage of any order and architecture, with the function of controlling the minimum dynamic of the sigma-delta modulator. This second sigma-delta stage is input with the output signal of the sigma-delta modulator summed to a signal corresponding to the difference between the input signal and the output signal of the second sigma-delta stage, delayed by a delay block.

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Pogliano Milanese, Italy

Simone Ferri