Method and Apparatus for Processing a Pulsatile Biometric Signal
First Claim
1. A method for processing a pulsatile signal of light reflected from a living subject, the method comprising:
- activating a light source to transmit light to the living subject during an accumulation time;
detecting at least one sample of the light reflected from the living subject using a detector unit;
determining if the at least one sample of light approaches a saturation level of the detector unit; and
adjusting the accumulation time to prevent saturation of the detector unit if it has been determined, in the determining step, that the at least one sample of light has approached a saturation level of the detector unit.
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Abstract
A method for processing a pulsatile signal of light reflected from a living subject can include the step of activating a light source to transmit light to the living subject during an accumulation time. The method can include the step of detecting at least one sample of the light reflected from the living subject using a detector unit and determining if the sample(s) of light approaches a saturation level of the detector unit. The method can include the step of adjusting the accumulation time to prevent saturation of the detector unit if it has been determined that the at least one sample of light has approached a saturation level of the detector unit.
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Citations
20 Claims
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1. A method for processing a pulsatile signal of light reflected from a living subject, the method comprising:
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activating a light source to transmit light to the living subject during an accumulation time; detecting at least one sample of the light reflected from the living subject using a detector unit; determining if the at least one sample of light approaches a saturation level of the detector unit; and adjusting the accumulation time to prevent saturation of the detector unit if it has been determined, in the determining step, that the at least one sample of light has approached a saturation level of the detector unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for processing a pulsatile signal of light reflected from a living subject, the method comprising:
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activating at least a first light source and a second light source simultaneously to transmit light to a living subject during a first time period; detecting a first set of signals from light reflected from the living subject using a detector unit; filtering out a DC component of the first set of signals to extract an AC component of the first set of signals; and processing the AC component to identify a rising portion of the AC component used to calculate a level of oxygen saturation of the living subject. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for processing a pulsatile biometric signal, the method comprising
detecting a first set of signals from a living source, wherein the first set of signals comprises a pulsatile waveform and a constant component; -
extracting the pulsatile waveform from the first set of signals; processing the pulsatile waveform to generate critical timing information; and selecting from a second set of signals based on the critical timing information to calculate a biometric measurement, wherein the second set of signals comprises the pulsatile waveform and the constant component. - View Dependent Claims (20)
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Specification