Computer-Assisted Composition (Orchids)

Orchestration par la recherche automatique d’instrumentations et de superpositions d’instruments approchant une cible définie par le compositeur

A unique and recent case of computer-assisted composition, this project addresses the question of orchestration via an automatic search of instrumentation and layering instruments approaching, depending on different acoustic similarity criteria, a target defined by the composer. Current research endeavors to make this dynamic orchestration paradigm heard, according to the targets with sonorous characteristics that vary with time.

Realized after the Orchidée software suite, Orchids is the first complete system for temporal computer-assisted orchestration and the optimization of timbre combinations. It provides an ensemble of algorithms making it possible to recreate any sound target that changes over time through a combination of instruments or samples, according to the psycho-acoustic criteria. This can help composers obtain unique timbre colors providing a multitude of effective solutions to best recreate the sound target. Through a large selection of functions, Orchids can also recreate the evolutions and abstract forms of spectral movements. Its results provide multiple orchestra scores that can be organized intuitively in order to quickly construct orchestral and musical ideas. This system provides several approximation algorithms that make it possible to conjointly optimize several timbre features. The advantages of the Orchids system lies in the fact that this approximation can be carried out separately on temporal forms, values, mean values or standard deviations (or any combination of the three) of each psycho-acoustic descriptor. In addition, users can also manually define a temporal deformation and carry out a multi-target search within several sound segments, making it possible to create full orchestral works in just a few seconds.

IRCAM's Team: Musical Representations.

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