University of Tsukuba
Abstract :
Visualizing the mechanical parameters given by the player to the
instrument may help to improve the performance technique. Thus,
the methods to measure parameters that have less influence on
musical performance are required. In this research, we proposed a
non-contact measurement method of bow force and friction force
using an ordinary camera (not high speed). By using an ordinary
camera instead of a high-speed camera, we can obtain the average
position of the strings from the blurred image. The process consists of
the following 3 steps: (1) Taking the video of illuminated strings with
a camera. (2) The position of the strings is calculated from the center
of gravity illuminated part. (3) String displacement from a neutral
position is converted into bow force and friction force using the
relation between position and force in a string. In addition, this
method is possible to visualize the bow force and frictional force with
real-time, so a player can check it there. We confirmed the validity of
the proposed method by a verification experiment.