This grunting was recorded with a microphone
in front of the mouth of a premature baby girl with respiratory distress 7 hours
provides a visual representation of the content of the respiratory sound
recording. Time is shown on the horizontal and frequency on the vertical
axis. Sound intensity is indicated on a color scale, ranging from red (loud)
over yellow and light green (medium) to dark green and gray (low). The breathing
signal from Respitrace shows the rib cage [RC] movement plotted at the top and
the abdominal [AB] movement at the bottom (inspiration = up, expiration = down). Note: there is asynchronous movement of chest and abdomen during inspiration, clinically apparent as "indrawing".