Patent ID: 11950911
Assignee: STMICROELECTRONICS S.R.L.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 12:
13. A vehicle comprising:
a vehicle ignition circuit; and
a vehicle-key device coupled to the vehicle ignition circuit, the vehicle-key device comprising:
a PhotoPletysmoGraphy (PPG) sensor configured to collect at least one electrophysiological signal of a human; and
processing circuitry configured to:
receive the at least one collected electrophysiological signal over a limited time duration;
discontinue the receiving at an expiry of the limited time duration;
compute a set of electrophysiological signal features as a function of the at least one collected electrophysiological signal, wherein the computing comprises at least one of:
i) provide at least one reference electrophysiological signal and apply dynamic time warping processing to the at least one collected electrophysiological signal and to the at least one reference electrophysiological signal;
ii) apply stacked-auto-encoder artificial neural network (SAE ANN) processing to the at least one collected electrophysiological signal; or
iii) filter the at least one collected electrophysiological signal via joint low-pass and high-pass filtering using a set of filtering parameters including low-pass filter parameters and high-pass filter parameters having a set of low-pass cut-off frequencies and a set of high-pass cut-off frequencies, respectively;

apply pattern recognition processing to the computed set of electrophysiological signal features, wherein the pattern recognition processing produces a virtual key signal indicative of an identity of the human; and
apply the virtual key signal to a user circuit to switch the user circuit between a first state and a second state as a result of the virtual key signal matching an authorized key signal stored in the user circuit.