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...http://www.google.fr/patents/US5368224?utm_source=gb-gplus-shareBrevet US5368224 - Method for reducing ambient noise effects in electronic monitoring instruments
Method for reducing ambient noise effects in electronic monitoring instruments
