Master's Thesis: An Interactive Musical Installation Using Physical Modeling and Algorithmic Composition
Author
Christensen, Pelle Juul
Term
4. Term
Education
Publication year
2020
Submitted on
2020-05-28
Pages
61
Abstract
Det Danske Musikmuseum ønsker at give gæsterne en engagerende musikalsk oplevelse, blandt andet gennem interaktive installationer. Denne afhandling beskriver designet af en sådan installation. Først anvendes et rammeværk for brugerroller – en måde at kategorisere, hvordan besøgende kan deltage – til at gennemgå den nyeste udvikling inden for musikalske installationer og til at forme designet af vores løsning. Lydsiden bygger på fysiske modeller skabt med finite-difference time-domain (FDTD)-teknikker, som numerisk simulerer, hvordan instrumenter svinger over tid. Her modelleres en strøget streng og et slået, stemt slagtøjsinstrument, som udgør installationens klanggrundlag. Afhandlingen skitserer også den historiske udvikling af algoritmisk komposition (musik, der skabes ved hjælp af regler eller kode) og forklarer den nuværende komposition. Hovedgrebene er split-note rytmegenerering, hvor toner opdeles for at skabe rytmiske mønstre, og tonerækketeknik, hvor en fast rækkefølge af toner danner strukturen. Brugeren interagerer via en Leap Motion håndsensor, der registrerer håndbevægelser i luften, så rytmisk og melodisk indhold samt dynamik (styrkegrad) kan styres i realtid. Afhandlingen afrundes med perspektiver for videre udvikling og en konklusion.
The Danish Music Museum aims to give visitors an engaging musical experience, in part through interactive installations. This thesis describes the design of one such installation. We first use a user role framework—a way to categorize how visitors participate—to review the state of the art in musical installations and to guide our design. The sound engine is based on physical models created with finite-difference time-domain (FDTD) techniques, which numerically simulate how instruments vibrate over time. We model a bowed string and a struck pitched percussion instrument to provide the installation’s sonic palette. The thesis also outlines the history of algorithmic composition (music generated by rules or code) and explains the current composition. Its main elements are split-note rhythm generation, which divides notes to create rhythmic patterns, and tone row techniques, which organize pitches in a fixed sequence. User input is captured by a Leap Motion hand tracker that senses hand movements in the air, allowing real-time control of rhythmic and melodic content and dynamics (loudness). The work concludes with prospects for future development and a conclusion.
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