Physiological signal determination of bioimpedance signals

摘要

Embodiments relate generally to wearable computing devices in capturing and deriving physiological characteristic data. More specifically, disclosed are one or more electrodes and methods to determine physiological characteristics using a wearable device (or carried device) and one or more sensors. In one embodiment, a method includes determining a drive signal magnitude for a bioimpedance signal to capture data representing a physiological-related component and selecting the drive signal magnitude as a function of an impedance of a tissue. The bioimpedance signal can be applied to electrodes that are configured to convey the bioimpedance signal to the tissue. In some cases, data representing a value a signal-to-noise (“SNR”) ratio may be adapted to form an adaptive signal-to-noise value. A portion of a received bioimpedance signal may be detected, the received bioimpedance signal being based on the adaptive signal-to-noise value. A physiological characteristic can be derived.

主权项

1. A method comprising:
determining a drive signal magnitude for a bioimpedance signal to capture a sensor signal including data representing a physiological-related component; selecting the drive signal magnitude as a function of an impedance of a sample of a tissue; driving the bioimpedance signal to one or more drive electrodes that are configured to convey the bioimpedance signal to the sample of tissue; adapting data representing a value a signal-to-noise (“SNR”) ratio as a function of the impedance of the sample of the tissue to form an adaptive signal-to-noise value; detecting a portion of the physiological-related signal component from a received bioimpedance signal as the sensor signal based on the adaptive signal-to-noise value; and deriving a physiological characteristic from the physiological-related signal component.