首页>
外国专利>
Method and apparatus for reducing ambient noise effects in electronic monitoring instruments
Method and apparatus for reducing ambient noise effects in electronic monitoring instruments
展开▼
机译:减少电子监控仪器中的环境噪声影响的方法和装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
The present invention provides a method and apparatus for adapting to noise sources affecting a pulse oximeter. Various available frequencies are evaluated to determine their respective noise levels and one is selected to act as the operating demultiplexer frequency. During normal operation of the pulse oximeter, the various available demultiplexer frequencies are periodically scanned to determine which has the lowest associated noise. The noise level associated with the operating frequency is used to determine the signal-to-noise ratio of the pulse oximeter signals and thereby qualify certain signals from the pulse oximeter. Those pulses associated with a signal-to-noise ratio below a predetermined threshold are rejected and excluded from use in calculating blood oxygen saturation.
展开▼