Musical information processing reflecting its structure 音楽情報処理の構造的考察

博士論文

In pursuit of generating expressive musical rendition with rules, the computer music project Psyche has greatly concerned musical structure. Although described implicitly, musical structure exists innately and absolutely in musical scores. This thesis demonstrates the successful introduction of musical structure to computer music systems that are related to performance synthesis. Two systems, a performance visualization system and a computer-assisted musical analysis system Daphne, are described. A performance visualization proves the significance of musical structure for analysis and synthesis of performance. Since musical structure and relationships between its occurrences regulate performance expression, the rationale of performance can be explained at a glance with visualization enables users to find resemblances between performances which derive performance rules. The innovative figures of performance visualization is implemented to a system on which users can synthesize performance as well as analyze it. Based on musicology, the attributive information of musical structure as items of performance analysis are clarified through the design and implementation of a musical analysis system Daphne. Users can obtain the indispensable information for performance synthesis by Daphne through its realistic user interface with score images and performance. Two matters on computer music systems were figured out: the difficulty in evaluating them and the applicability and limitation of object-oriented approach to them.

1998