Patent ID: 8491492

Claim:
Apparatus, comprising: a mechanical sensor configured to detect a physiological signal of a subject without contacting or viewing the subject or clothes that the subject is wearing; a control unit configured to: receive the physiological signal from the sensor over a time duration of at least two hours at a given period of at least one first baseline day, determine a physiological parameter of the subject based upon the received physiological signal of the first baseline day; receive the physiological signal from the sensor over a time duration of at least two hours at a given period of a second day, the period over which the subject's physiological signal is detected on the second day overlapping with the period over which the subject's physiological signal is detected on the first baseline day; determine a physiological parameter of the subject based upon the received physiological signal of the second day; compare the physiological parameter based upon the received physiological signal of the second day to the baseline physiological parameter of the subject; and generate an alert in response to the comparison; and an output unit configured to output the alert.