Method and apparatus for reducing ambient noise effects in elect

Details Method and apparatus for reducing ambient noise effects in elect Method and apparatus for reducing ambient noise effects in elect

1996-04-18

1998-02-03

Bahr, Jennifer

Surgery

Truss

Pad

356 41, A61B 500

Patent

active

057133557

ABSTRACT:
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.

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