Methods and systems for modulation and demodulation of optical signals
US9952095B1 · kind B1 · utility
69Cited by
48References
20Claims
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Key dates
| Filing date | Feb 10, 2015 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | Feb 10, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/444
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.