发明名称 |
Method and apparatus for demodulating signals in a pulse oximetry system |
摘要 |
A method and an apparatus measure blood oxygenation in a subject. A light source is activated to cause a first emission at a first wavelength and a second emission at a second wavelength. A detector detects a composite signal indicative of an attenuation of the first and second wavelengths by tissue of a patient. The composite signal is demodulated into a first intensity signal and a second intensity signal. Blood oxygenation in the subject is determined from the first and second intensity signals. In one embodiment, demodulation is based at least in part on a period when at least one of the wavelengths is not activated. In one embodiment, a modulation of the first and second wavelengths is determined in order to avoid frequencies of ambient noise. In one embodiment, the composite signal's sampling rate is reduced before and/or after demodulation.
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申请公布号 |
US8185180(B2) |
申请公布日期 |
2012.05.22 |
申请号 |
US20070842106 |
申请日期 |
2007.08.20 |
申请人 |
DIAB MOHAMED K.;WEBER WALTER M.;AL-ALI AMMAR;MASIMO CORPORATION |
发明人 |
DIAB MOHAMED K.;WEBER WALTER M.;AL-ALI AMMAR |
分类号 |
A61B5/145;A61B5/1455;A61B5/00 |
主分类号 |
A61B5/145 |
代理机构 |
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主权项 |
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地址 |
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