Simultaneous multi-LED pulse-oximetry sampling
A computer system for simultaneously sampling multiple light channels is configured to emit a first pulse-oximetry light signal from a first light source and to emit a second pulse-oximetry light signal from a second light source. The computer system then captures a combined pulse-oximetry signal from both the first pulse-oximetry light signal and the second pulse-oximetry light signal simultaneously at a photoreceptor sensor. The computer system identifies information within the combined pulse-oximetry signal, wherein the first light source and the second light source capture different attributes of the information.
1. A computer system for simultaneously sampling multiple light channels, comprising:
one or more processors; and
one or more non-transitory computer-readable media having stored thereon executable instructions that when executed by the one or more processors configure the computer system to perform at least the following:
emit, into a human body, a first pulse-oximetry light signal from a first light source, wherein the first light source is driven by a first carrier frequency;
emit, into the human body, a second pulse-oximetry light signal from a second light source, wherein the second light source is driven by a second carrier frequency that is different from the first carrier frequency;
after interacting with the human body, capture at a photoreceptor sensor a combined pulsatile signal that comprises information from both the first pulse-oximetry light signal and the second pulse-oximetry light signal;
generate a mixed signal by mixing the combined pulsatile signal with the first carrier frequency and the second carrier frequency or close intermediate frequencies;
generate a filtered signal by processing the mixed signal through a filter; and
identify pulse-oximetry information within the filtered signal.
2. The computer system of claim 1 , wherein the photoreceptor sensor comprises a single photodiode that captures both the first pulse-oximetry light signal and the second pulse-oximetry light signal simultaneously.
3. The computer system of claim 1 , wherein the photoreceptor sensor comprises a first photodiode that captures the first pulse-oximetry light signal and a second photodiode that captures the second pulse-oximetry light signal simultaneously.
4. The computer system of claim 3 , wherein the first photodiode comprises a first filter that is configured to exclude light other than the first pulse-oximetry light signal and a second filter that is configured to exclude light other than the second pulse-oximetry light signal.
5. A computer-implemented method for simultaneously sampling multiple light channels, the computer-implemented method implemented on one or more computer processors executing instructions stored on non-transitory computer-readable media, the method comprising:
emitting, into a human body, a first pulse-oximetry light signal from a first light source, wherein the first light source is driven by a first carrier frequency;
emitting, into the human body, a second pulse-oximetry light signal from a second light source, wherein the second light source is driven by a second carrier frequency that is different from the first carrier frequency;
after interacting with the human body, capturing at a photoreceptor sensor a combined pulsatile signal that comprises information from both the first pulse-oximetry light signal and the second pulse-oximetry light signal;
generating a mixed signal by mixing the combined pulsatile signal with the first carrier frequency and the second carrier frequency or close intermediate frequencies;
generating a filtered signal by processing the mixed signal through a filter; and
identifying pulse-oximetry information within the filtered signal.
6. The computer-implemented method of claim 5 , wherein the photoreceptor sensor comprises a single photodiode that captures both the first pulse-oximetry light signal and the second pulse-oximetry light signal simultaneously.
7. The computer-implemented method of claim 5 , wherein the photoreceptor sensor comprises a first photodiode that captures the first pulse-oximetry light signal and a second photodiode that captures the second pulse-oximetry light signal simultaneously.
8. The computer-implemented method of claim 7 , wherein the first photodiode comprises a first filter that is configured to exclude light other than the first pulse-oximetry light signal and a second filter that is configured to exclude light other than the second pulse-oximetry light signal.