Probabilistic Extension to the Concurrent Constraint Factor Oracle Model for Music Improvisation
This work addresses the problem of unpredictable sequence variation in real-time music improvisation systems for musicians and developers, representing an incremental improvement.
The paper tackled the lack of control in non-deterministic music improvisation models by extending the Concurrent Constraints Factor Oracle model with probabilistic constraints, maintaining real-time compatibility without changing time and space complexity, and developed a real-time interpreter (Ntccrt) to execute the model.
We can program a Real-Time (RT) music improvisation system in C++ without a formal semantic or we can model it with process calculi such as the Non-deterministic Timed Concurrent Constraint (ntcc) calculus. "A Concurrent Constraints Factor Oracle (FO) model for Music Improvisation" (Ccfomi) is an improvisation model specified on ntcc. Since Ccfomi improvises non-deterministically, there is no control on choices and therefore little control over the sequence variation during the improvisation. To avoid this, we extended Ccfomi using the Probabilistic Non-deterministic Timed Concurrent Constraint calculus. Our extension to Ccfomi does not change the time and space complexity of building the FO, thus making our extension compatible with RT. However, there was not a ntcc interpreter capable of RT to execute Ccfomi. We developed Ntccrt --a RT capable interpreter for ntcc-- and we executed Ccfomi on Ntccrt. In the future, we plan to extend Ntccrt to execute our extension to Ccfomi.