Patent ID: 9543946
Date: 2017-01-10
CPC Classifications: A61B,H03K

Claim:
1. A signal processing device, comprising: a detection unit configured to detect an intent to use the signal processing device based on a determination of whether the signal processing device is in electrical contact with a subject, the detection unit comprising two first electrical contacts; and a power supply unit configured to supply power to operate the signal processing device based on the detected intent and generate a bias voltage separate from the power, the power supply unit comprises an enable terminal; and wherein the detection unit is configured to perform the determining of whether the signal processing device is in electrical contact with the subject by supplying a first voltage of the bias voltage to one of the two first electrical contacts and sensing a second voltage from another of the two first electrical contacts, and when the determination indicates that the signal processing device is in electrical contact with the subject the two first electrical contacts are contacting one of the subject and a first conductive member of a biometric electrode unit, wherein the another of the two first electrical contacts is connected to the enable terminal, wherein the power supply unit is configured to maintain the supplied power during a predetermined threshold after the detection unit no longer detects that the signal processing device is in electrical contact with the subject.