Detecting conditions using heart rate sensors
This relates to methods for measuring irregularities in a signal and corresponding devices. The devices can include a PPG sensor unit configured to detect multiple occurrences of a given event in the measured signal(s) over a sampling interval. In some instances, the device can register the occurrences of the events. In some examples, the device can include one or more motion sensors configured to detect whether the device is in a low-motion state. The device may delay initiating measurements when the device is not in a low-motion state to enhance measurement accuracy. Examples of the disclosure further include resetting the sample procedure based on one or more factors such as the number of non-qualifying measurements. In some examples, the device can be configured to perform both primary and secondary measurements, where the primary measurements can include readings using a set of operating conditions different from the secondary measurements.
1. A device comprising:
one or more PPG sensor units including:
at least one light source configured to emit light; and
at least one light detector configured to detect a portion of a reflection of the emitted light and configured to generate one or more physiological signals indicative of the detected portion of the reflection of the emitted light;
a display configured to display a graphical user interface; and
circuitry that:
receives the one or more physiological signals from a primary measurement taken under a first set of operating conditions using light at a first wavelength; and
for the primary measurement:
determines whether at least one parameter of the one or more physiological signals meets a criteria threshold;
in accordance with a determination that the at least one parameter meets the criteria threshold, increases an occurrence value;
determines whether the occurrence value meets an occurrence threshold;
in accordance with a determination that the occurrence value meets the occurrence threshold, displays a notification on the graphical user interface;
in accordance with a determination that the occurrence value does not meet the occurrence threshold, waits a first amount of time before taking an additional primary measurement; and
receives one or more physiological signals from a secondary measurement taken under a second set of operating conditions using light at a second wavelength between the primary measurement and the additional primary measurement.
2. The device of claim 1 , further comprising:
a motion sensor configured to measure motion information,
wherein the circuitry further:
determines whether the motion information meets a motion threshold, and
for at least one of the one or more physiological signals:
in accordance with the determination that the at least one parameter of the one or more physiological signals meets the criteria threshold, waits a second amount of time;
measures one or more subsequent physiological signals; and
in accordance with the determination that the motion information meets the motion threshold, delays the measurement of the one or more subsequent physiological signals.
3. The device of claim 1 , wherein the device is capable of switching between different operating modes of at least one of the one or more PPG sensor units.
4. The device of claim 3 , wherein the at least one of the one or more PPG sensor units is configured to:
switch to operating with the second set of operating conditions after detecting a first instance, the first instance being a first determination that the occurrence value meets the occurrence threshold.
5. The device of claim 1 , wherein: the one or more PPG sensor units include at least two PPG sensor units;, wherein at least one of the at least two PPG sensor units is configured to operate in green wavelengths; and wherein
at least another of the at least two PPG sensor units is configured to operate in infrared wavelengths.
6. The device of claim 1 , further comprising:
a transceiver configured to transmit at least a portion of the primary measurement or secondary measurement of the one or more physiological signals to a second device, separate and distinct from the device.