专利名称：METHOD AND APPARATUS FOR
DEMODULATING SIGNALS IN A PULSEOXIMETRY SYSTEM
发明人：Mohamed K. Diab,Walter M. Weber,Ammar
Al-Ali
申请号：US11750930申请日：20070518
公开号：US20070225582A1公开日：20070927
专利附图：
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 ata second wavelength. A detector detects a composite signal indicative of an attenuationof the first and second wavelengths by tissue of a patient. The composite signal isdemodulated into a first intensity signal and a second intensity signal. Blood oxygenationin 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 thewavelengths is not activated. In one embodiment, a modulation of the first and secondwavelengths is determined in order to avoid frequencies of ambient noise. In oneembodiment, the composite signal's sampling rate is reduced before and/or afterdemodulation.
申请人：Mohamed K. Diab,Walter M. Weber,Ammar Al-Ali
地址：Mission Viejo CA US,Laguna Hills CA US,Costa Mesa CA US
国籍：US,US,US
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