NTCCRT: A concurrent constraint framework for soft-real time music interaction

Writing music interaction systems is not easy because their concurrent processes usually access shared resources in a non-deterministic order, often leading to unpredictable behavior. Using Pure Data (Pure Data) and Max/MSP, it is possible to program concurrency; however, it is difficult to synchronize processes based on multiple criteria. Process calculi such as the Non-deterministic Timed Concurrent Constraint (ntcc) calculus, overcome that problem by representing, declaratively, the synchronization of multiple criteria as constraints. In this article, we propose the framework Ntccrt, as a new alternative to manage concurrency in Pure Data and Max/MSP. Ntccrt is a real-time capable interpreter for ntcc. Using Ntccrt binary plugins in Pure Data, we executed models for machine improvisation and signal processing. We also analyzed two case studies: one of a machine improvisation system and one of a signal processing system. We found out that performance of both case studies is compatible with soft real-time music interaction; it means, a musician can interact with Ntccrt without noticeable delays during the interaction.

• Autores: Toro, Mauricio; Rueda, Camilo; Agón, Carlos; Assayag, Gérard
• Fecha de publicación: 2015
• Institución: Universidad EAFIT
• Repositorio: Repositorio EAFIT
• Idioma: eng
• OAI Identifier: oai:repository.eafit.edu.co:10784/7943
• Acceso en línea: http://hdl.handle.net/10784/7943
• Palabra clave: Concurrent Constraint Programming (ccp); Soft Real-Time; Machine Improvisation; Signal Processing; Music Interaction; Computer Music; Process Calculi
• License: Acceso abierto