A method and an apparatus measure blood oxygenation in a subject. A first signal source applies a first input signal during a first time interval. A second signal source applies a second input signal during a second time interval. A detector detects a first parametric signal responsive to the first input...http://www.google.de/patents/US20010002206?utm_source=gb-gplus-sharePatent US20010002206 - Method and apparatus for demodulating signals in a pulse oximetry system
Method and apparatus for demodulating signals in a pulse oximetry system
