Fig. 2

Graphical visualization of lung sounds using a simple diagram. This visualization was modified from a previous study [9]. A simple diagram showing a single breath, inspiration, and expiration phases is marked with blue and pink backgrounds. The vertical axis represents the pitch of the lung sounds, the horizontal axis represents the duration of the lung sounds and presents a spectrogram of the sounds. A continuous rale is depicted as a line and an intermittent rale is depicted as a circle. The thickness of the line or size of the circle represents the loudness of the sound