Figure 6From: Unconstrained snoring detection using a smartphone during ordinary sleep Formant analysis of sounds generated in an actual sleep environment. A) sound of a device alarm, B) coughing, C) sound of a door opening/closing, D) sound of fan, E) sound of a radio, F) sound of music, G) sound of talking, H) sound of a footstep, and I) snoring.Back to article page