Patent ID: 11944417
Assignee: BOMDIC INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 9:
10. A wearable device, comprising:
a photoplethysmography (PPG) transceiver,
a processor, coupled to the PPG transceiver, wherein
in response to determining that the wearable device is in a static state by the processor, the processor controls the PPG transceiver to emit a plurality of first PPG signals and detect a plurality of second PPG signals corresponding to the first PPG signals;
a zero-crossing rate corresponding to the second PPG signals is obtained by the processor;
in response to determining that the zero-crossing rate of the second PPG signals is greater than a reference threshold by the processor, the processor determines that the wearable device is in an unworn state; and
in response to determining that the zero-crossing rate of the second PPG signals is not greater than the reference threshold, it is determined that the wearable device is in a worn state.