Simultaneous signal attenuation measurements utilizing code division multiplexing
US6505133B1 · kind B1 · utility
170Cited by
33References
24Claims
0Family size
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Key dates
| Filing date | Nov 15, 2000 |
| Grant date | Jan 7, 2003 |
| Priority date | — |
| Expiry date | Nov 15, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7228
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pulse oximeter (100) includes two or more light sources (102) for transmitting optical signals through an appendage (103) of patient. The sources (102) are operated to transmit code division multiplexed (CDM) signals. That is, the sources (102) are driven by drives (104) in response to signals from a digital processing unit (116) such that the sources (102) are modulated using different code sequences. The code sequences are preferably non-periodic and may be orthogonal to one another. The use of such CDM signals provides certain advantages related to noise reduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.