SNR in Pulse Oximeters Watch

Joseph Mckeown
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I'm a second year physics student trying to find out about Pulse Oximetry and I need to know what kind of signal-to-noise ratio is required for a pulse oximeter to be valid and functional. Can anyone explain to me either the answer (what SNR is good and why) or where to find out? I've been trawling through papers for days and I can't find out!

Any help will be gratefully accepted!
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