DEVICE AND METHOD FOR REMOVAL OF AMBIENT NOISE SIGNAL FROM A PHOTOPLETHYSMOGRAPH
First Claim
1. A method for removal of ambient noise signal from an optical measurement, the method comprising:
- obtaining a first signal waveform based on detecting light based on a first light illumination;
obtaining a second signal waveform based on detecting light based on a second light illumination;
tuning the first light and second light illumination such that the maximum amplitudes of the first and second signal waveforms are maximised and within a predetermined saturation range, such that ambient light interference for the first and second signal waveforms is reduced;
obtaining a third signal waveform based on detecting ambient light;
obtaining respective maximum and minimum values of the first and the second signal waveforms, said obtaining respective maximum and minimum values being performed at a plurality of identified sample points;
performing one or more summation operations based on the plurality of identified sample points; and
deriving signal values of the first and second signal waveforms with the removal of ambient noise using the third signal waveform and by using the results of the one or more summation operations.
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Abstract
A device and method for removal of ambient noise signal from a photoplethysmographic measurement is provided. The method comprises obtaining a first signal waveform based on detecting light based on a first light illumination; obtaining a second signal waveform based on detecting light based on a second light illumination; tuning the first light and second light illumination such that the maximum amplitudes of the first and second signal waveforms are maximised and within a predetermined saturation range, such that ambient light interference for the first and second signal waveforms is reduced; obtaining a third signal waveform based on detecting ambient light; obtaining respective maximum and minimum values of the first and the second signal waveforms; and deriving signal values of the first and second signal waveforms with the removal of ambient noise by subtracting AC and DC average values of the third signal waveform from the first and second signals.
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Citations
31 Claims
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1. A method for removal of ambient noise signal from an optical measurement, the method comprising:
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obtaining a first signal waveform based on detecting light based on a first light illumination; obtaining a second signal waveform based on detecting light based on a second light illumination; tuning the first light and second light illumination such that the maximum amplitudes of the first and second signal waveforms are maximised and within a predetermined saturation range, such that ambient light interference for the first and second signal waveforms is reduced; obtaining a third signal waveform based on detecting ambient light; obtaining respective maximum and minimum values of the first and the second signal waveforms, said obtaining respective maximum and minimum values being performed at a plurality of identified sample points; performing one or more summation operations based on the plurality of identified sample points; and deriving signal values of the first and second signal waveforms with the removal of ambient noise using the third signal waveform and by using the results of the one or more summation operations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for removal of ambient noise signal from an optical measurement, the device comprising:
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a coupling member for receiving a first signal waveform obtained based on detecting light based on a first light illumination, a second signal waveform obtained based on detecting light based on a second light illumination, and a third signal waveform obtained based on detecting ambient light, the coupling member suitable for coupling to an optical measurement device; and a processor module for obtaining respective maximum and minimum values of the first and the second signal waveforms, said obtaining respective maximum and minimum values being performed at a plurality of identified sample points, the processor being arranged to perform one or more summation operations based on the plurality of identified sample points, and the processor further being arranged to derive signal values of the first and second signal waveforms with the removal of ambient noise using the third signal waveform and by using the results of the one or more summation operations, wherein the first and second light illumination are switched to a maximum intensity such that the maximum amplitudes of the first and second signal waveforms are maximised and within a predetermined saturation range, such that ambient light interference for the first and second signal waveforms is reduced. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A non-transitory computer readable data storage medium having stored thereon computer code means for instructing a processor of a feedback unit to execute a method for removal of ambient noise signal from an optical measurement, the method comprising:
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obtaining a first signal waveform based on detecting light based on a first light illumination; obtaining a second signal waveform based on detecting light based on a second light illumination; tuning the first light and second light illumination such that the maximum amplitudes of the first and second signal waveforms are maximised and within a predetermined saturation range, such that ambient light interference for the first and second signal waveforms is reduced; obtaining a third signal waveform based on detecting ambient light; obtaining respective maximum and minimum values of the first and the second signal waveforms, said obtaining respective maximum and minimum values being performed at a plurality of identified sample points; performing one or more summation operations based on the plurality of identified sample points; and deriving signal values of the first and second signal waveforms with the removal of ambient noise using the third signal waveform and by using the results of the one or more summation operations.
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Specification