05921921 is referenced by 170 patents and cites 18 patents.

A preferred oximeter detects the transillumination by red and infrared light of a portion of an in vivo subject and produces analog signals representative thereof on two channels. Sigma-delta modulators sample the analog signals on each channel. A digital filter processor digitally filters the sample signals from both modulators to produce respective digital signals with multi-bit resolution.

Title
Pulse oximeter with sigma-delta converter
Application Number
8/769148
Publication Number
5921921
Application Date
December 18, 1996
Publication Date
July 13, 1999
Inventor
Michael W Nootbaar
Benica
CA, US
Robert Stephen Potratz
Overland Park
KS, US
Agent
Hovey Williams Timmons & Collins
Assignee
Nellcor Puritan Bennett
CA, US
IPC
A61B 5/00
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