Adaptive controller used in photoplethysmography sensing system
An adaptive controller used in a photoplethysmography sensing system, comprises a plurality of hardware circuits which are configured to: receive a photoplethysmography signal (hereinafter, “PPG signal”) processed; determine whether the PPG signal processed satisfies with a requirement; output the PPG signal processed if the PPG signal processed satisfies with a requirement; and adjust a gain of an amplifier for amplifying the PPG signal and/or a driving signal of a light source if the PPG signal processed does not satisfy with a requirement.
1. An adaptive controller used in a photoplethysmography (PPG) sensing system, comprising:
a filter, configured to receive a plurality of PPG signals generated by a plurality of photo sensors, and output a plurality of filtered PPG signals, wherein each filtered PPG signal of the plurality of filtered PPG signals has a peak;
a peak detection circuit, configured to receive the plurality of filtered PPG signals, and generate a plurality of processed PPG signals; and
a plurality of error amplifiers, wherein each error amplifier of the plurality of error amplifiers is configured to compare the peak of a filtered PPG signal of the plurality of filtered PPG signals with a reference signal, and output a control signal to a gate of a corresponding switch transistor according to a comparison result, wherein the corresponding switch transistor has an end configured to be connected to a light source, and a driving signal of the light source is configured to be adjusted according to the control signal.
2. The adaptive controller according to claim 1 , wherein the plurality of PPG signals is configured to convey different physiology information.
3. The adaptive controller according to claim 2 , wherein the plurality of PPG signals corresponds to different wavelengths.
4. The adaptive controller according to claim 2 , wherein the plurality of processed PPG signals is compared with a physiology information.
5. The adaptive controller according to claim 1 , wherein the plurality of processed PPG signals is provided to a remote server for a comparison with a physiology information.
6. A photoplethysmography sensing system comprising:
a plurality of light sources, configured to generate beams emitting to a skin surface of a living object according to a driving signal;
a plurality of photo sensors, configured to receive reflection beams from the skin surface, and generate a plurality of PPG signals according to the reflection beams; and
an adaptive controller of claim 1 .
7. The photoplethysmography sensing system according to claim 6 , wherein the plurality of processed PPG signals is configured to convey different physiology information.
8. The photoplethysmography sensing system according to claim 7 , wherein the plurality of light sources is discretely distributed for providing the beams to different locations of the skin surface.
9. The photoplethysmography sensing system according to claim 8 , wherein the plurality of light sources is discretely distributed for sensing radial artery, ulnar artery, brachial artery or micro-vessel underneath the skin surface.
10. The photoplethysmography sensing system according to claim 7 , wherein the beams have same or different wavelengths.
11. The photoplethysmography sensing system according to claim 7 , wherein the plurality of processed PPG signals is compared with a physiology information.
12. The photoplethysmography sensing system according to claim 6 , wherein the plurality of processed PPG signals is provided to a remote server for a comparison with a physiology information.
13. The photoplethysmography sensing system according to claim 6 , wherein the photoplethysmography sensing system is a portable physiology information sensor.
14. The photoplethysmography sensing system according to claim 13 , wherein the portable physiology information sensor is at least one of portable optical blood pressure meter, pulse and blood oxygen meter, non-invasive blood flow meter and non-invasive blood glucose meter.
15. The photoplethysmography sensing system according to claim 13 , wherein the portable physiology information sensor is a wearable device.
16. The photoplethysmography sensing system according to claim 13 , wherein the portable physiology information sensor is configured to transmit a measured PPG signal, a physiology information, or both to an electronic device with communication ability.
17. The photoplethysmography sensing system according to claim 16 , wherein the electronic device is configured to display a PPG signal, a physiology information, or both.
18. The photoplethysmography sensing system according to claim 13 , wherein the portable physiology information sensor is configured to acquire physiology information of heart rate, pulse, blood pressure, blood oxygen, blood flow and glucose through a PPG signal.