Fig. 18
From: Reflective oxygen saturation monitoring at hypothenar and its validation by human hypoxia experiment
Representative raw PPG, adaptively filtered PPG and hand acceleration signals. a Typical infrared PPG signals before and b after processing by the ANC algorithm (LMS, M = 24). c Typical red PPG signal before and d after processing by the ANC algorithm (LMS, M = 24). e The corresponding reference noise obtained simultaneously from the accelerometer.