Hello Edmond, Thank you for your post. T he calculation of SpO2 from AC and DC components of Red and IR are fairly well documented. However, accurate % SpO2 is computed based on the empirical calibration of the ratio of ratios for the specific device. We generally do not go into the details of the SpO2 calculation as w e leave the implementation of the algorithms to the users. The application note below gives a little more background about this as well as useful techniques for acquiring a good PPG signal. https://www.ti.com/lit/pdf/slaa655 Regards, Ryan
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