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. 2013 Aug 8;1:2700208. doi: 10.1109/JTEHM.2013.2277870

Fig. 4.

Fig. 4.

Upper panel: the respiration (black line) and microphone (blue line) signals clearly indicate snoring. Middle and bottom panel: PPG raw data derived from our in-ear pulse oximeter without filtering. The sensor shows excellent measurement performance, independent from the snoring. Despite the proximity of the sensor to the throat and the expected impact of vibrations on the PPG signal, snoring has no influence on the pulse oximetry measurement.