Heart rate detecting device capable of alleviating motion interference
This instant disclosure provides a heart rate detecting device which includes an image sensor. The image sensor generates a first mixed signal within a first interval and generates a second mixed signal within a second interval, wherein the first mixed signal contains light information of first multiple light wavelengths having a first intensity ratio from one another, and the second mixed signal contains light information of second multiple light wavelengths having a second intensity ratio, different from the first intensity ratio, from one another.
1. A heart rate detecting device, comprising:
a first light source, configured to emit a first wavelength light;
a second light source, configured to emit a second wavelength light; and
an image sensor configured to generate a first mixed signal within a first interval upon the first light source and the second light source emitting light together and generate a second mixed signal within a second interval upon the first light source and the second light source emitting light together,
wherein the first wavelength light and the second wavelength light have a first intensity ratio within the first interval, and have a second intensity ratio, different from the first intensity ratio, within the second interval, and
decorrelation of the first mixed signal and the second mixed signal is configured to calculate a heart rate value.
2. The heart rate detecting device as claimed in claim 1 , further comprising a processor configured to control the first light source and the second light source to change emission intensity within the first interval and second interval.
3. The heart rate detecting device as claimed in claim 2 , wherein the processor is further configured to
decorrelate the first mixed signal and the second mixed signal to a obtain a first decorrelated signal and a second decorrelated signal, and
recognize a non-motion signal from the first decorrelated signal and the second decorrelated signal to calculate the heart rate value.
4. The heart rate detecting device as claimed in claim 3 , wherein the processor is configured to recognize the non-motion signal by comparing the first decorrelated signal and the second decorrelated signal with historical signals generated by the image sensor.
5. The heart rate detecting device as claimed in claim 3 , wherein the processor is configured to recognize the non-motion signal by comparing the first decorrelated signal and the second decorrelated signal with a G-sensor signal.
6. The heart rate detecting device as claimed in claim 1 , wherein
the first wavelength light is green light and the second wavelength light is red light, or
the first wavelength light is green light and the second wavelength light is infrared light.
7. The heart rate detecting device as claimed in claim 1 , wherein
within the first interval, the first wavelength light is stronger than the second wavelength light, and
within the second interval, the first wavelength light is weaker than the second wavelength light.
8. A heart rate detecting device, comprising:
an image sensor configured to generate a first mixed signal within a first interval and generate a second mixed signal within a second interval, wherein the first mixed signal contains light information of first multiple light wavelengths emitting together and having a first intensity ratio from one another, and the second mixed signal contains light information of second multiple light wavelengths emitting together and having a second intensity ratio, different from the first intensity ratio, from one another,
wherein decorrelation of the first mixed signal and the second mixed signal is configured to calculate a heart rate value.
9. The heart rate detecting device as claimed in claim 8 , wherein the first multiple light wavelengths are totally different from the second multiple light wavelengths.
10. The heart rate detecting device as claimed in claim 8 , wherein the first multiple light wavelengths are partially different from the second multiple light wavelengths.
11. The heart rate detecting device as claimed in claim 8 , wherein the first multiple light wavelengths are totally identical to the second multiple light wavelengths.
12. The heart rate detecting device as claimed in claim 8 , further comprising a processor configured to
decorrelate the first mixed signal and the second mixed signal to a obtain a first decorrelated signal and a second decorrelated signal, and
recognize a non-motion signal from the first decorrelated signal and the second decorrelated signal to calculate the heart rate value.
13. The heart rate detecting device as claimed in claim 12 , wherein the processor is configured to recognize the non-motion signal by comparing the first decorrelated signal and the second decorrelated signal with historical signals generated by the image sensor.
14. The heart rate detecting device as claimed in claim 12 , wherein the processor is configured to recognize the non-motion signal by comparing the first decorrelated signal and the second decorrelated signal with a G-sensor signal.
15. A heart rate detecting device, comprising:
an image sensor configured to generate a first mixed signal within a first interval and generate a second mixed signal within a second interval, wherein the first mixed signal contains light information of a first light combination of multiple light wavelengths emitting together, and the second mixed signal contains light information of a second light combination of multiple light wavelengths emitting together, wherein the second light combination includes at least one light wavelength not included in the first light combination,
wherein decorrelation of the first mixed signal and the second mixed signal is configured to calculate a heart rate value.
16. The heart rate detecting device as claimed in claim 15 , wherein one light wavelength included in both the first light combination and the second light combination has different intensity in the first interval and the second interval.