3.1 The Nature of Lip Vibration
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Fig. 3.11 Transparent
mouthpiece used for
high-speed video recording of
out-of-plane lip motion
during trombone playing.
From Stevenson (2009)
Fig. 3.12 A cycle of motion of a brass player’s lips (side view, obtained with a high-speed camera
and transparent mouthpiece). From Stevenson (2009)
Fig. 3.13 Images of three phases in the vibration cycle of the lips of a trombonist playing the note
B 1 fortissimo, side view. Left: closure. Centre: partial opening. Right: maximum opening. From
Stevenson (2009)
largely in the transverse direction. Similar trajectories illustrating the anticlockwise
cyclical motion of the lips of trombonists have been recorded by Boutin et al.
(2015b).