Optical instrument with ambient light removal
US9220409B2 · kind B2 · utility
9Cited by
19References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 31, 2012 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Jul 18, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/02416
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Processing circuitry may process a physiological signal such as a light signal attenuated by a subject. The physiological signal may include a desired component and an undesired component. A first filtering operation may be performed to remove at least a portion of the undesired component and a second filtering operation may be performed to reduce an undesired distortion introduced by the first filter. The transfer function of the second filter may be substantially the inverse of the transfer function of the first filter. One or more physiological parameters may be determined based on the filtered physiological signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.