A method for expressing pitching motion as sounds (rhythms and melodies)

(Focusing on the order and the magnitudes of segmental rotations)

Abstract

The purpose of this study is to introduce a method for expressing pitching motion as sound (rhythms and melodies). Rhythms and melodies were created from time-series kinematic data for five adult baseball pitchers. We focused on three factors: (1) the attained times and the magnitudes of maximum segmental angular velocities, (2) the movement pattern of pelvic rotation, (3) the movement pattern of the forearm on the pitching side after the foot is raised and used one of the following protocol for sound madding. The protocol 1 presented the times of multiple events as series of notes. A note was assigned to indicate the time and magnitude of each peak so that a rhythm is created to express pitching motion. The protocol 2 presented the movement pattern of a given body segment as pitch (frequency of sound wave). An incorrect technique called “opening up too early” was successfully expressed by transforming pelvic rotation velocity into sound wave frequency..