METHODS AND SYSTEMS FOR MODULATION AND DEMODULATION OF OPTICAL SIGNALS
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Abstract
An electronic device includes one or more light sources for emitting light toward a body part of a user and one or more optical sensors for capturing light samples while each light source is turned on and for capturing dark samples while the light source(s) are turned off. A signal produced by the one or more optical sensors is filtered and demodulated produce multiple demodulated signals each associated with a light source. Each signal associated with the light source(s) is analyzed to estimate or determine a physiological parameter of the user.
48 Citations
40 Claims
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1-20. -20. (canceled)
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21. A biometric sensor within a housing of a wearable electronic device, the biometric sensor comprising:
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an emitter for transmitting modulated light toward a measurement site of a subject through a first aperture in the housing; an optical sensor for receiving modulated light through a second aperture in the housing, the modulated light at least partially exiting the measurement site; a high pass filter to receive an output of the optical sensor, the high pass filter having a cutoff frequency above a frequency of a periodic optical property of the measurement site; and an analog to digital converter to receive an output of the high pass filter. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A biometric sensor within a housing of a wearable electronic device, the biometric sensor comprising:
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a first emitter for transmitting modulated light in a first frequency band toward a measurement site of a subject through a first lens positioned in the housing; a second emitter for transmitting modulated light in a second frequency band toward the measurement site of the first lens; an optical sensor for receiving modulated light through a second lens positioned in the housing and offset from the first lens; a first amplifier to receive an output of the optical sensor; and a high pass filter to receive an output of the first amplifier, the high pass filter having a cutoff frequency above a frequency of a periodic optical property of the measurement site; a second amplifier to receive an output of the high pass filter; and an analog to digital converter to receive an output of the second amplifier. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A biometric sensor within a housing of a wearable electronic device, the biometric sensor comprising:
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an emitter for transmitting modulated light within a frequency band toward a measurement site of a subject through a first aperture in a convex portion of the housing; an optical sensor for receiving modulated light through a second aperture in the convex portion of the housing, the second aperture opposite the first aperture such that an apex of the convex portion of the housing is between the first aperture and the second aperture; a high pass filter to receive an output of the optical sensor, the high pass filter having a cutoff frequency above a frequency of a periodic optical property of the measurement site; and an analog to digital converter to receive an output of the high pass filter. - View Dependent Claims (40)
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Specification