Acoustics and waveforms of lung sounds

The first column shows typical values for the frequency (hertz) and duration (milliseconds) of the various sounds. The second and third columns show amplitude time plots in unexpanded and time-expanded modes, respectively (amplitude is measured in arbitrary units and time in seconds). The unexpanded plots contain screenshots of the entire sound, with a vertical line showing where the time-expanded sections (200 msec) were obtained. All tracings begin with inspiration.