Abstract
Loudness is a psychological term used to describe the magnitude of an auditory sensation. The loudness of a sound depends not only on the intensity of the sound and its physical composition (the partials in the sound and their amplitudes and frequencies), but also on the subjective conditions of the listener. In this talk, we discuss the algorithms implemented in DISCO to compute the loudness of a synthesized sound. DISCO (Digital Instrument for Sonification and Composition) is an additive synthesis program that produces sound files from score files. Score files are generated by an editor, which implements the composer’s specifications of a piece. DISCO, written in C++, is being developed jointly by the authors at the University of Illinois at Urbana-Champaign (Computer Music Project) and Argonne National Laboratory (Mathematics and Computer Science Division). The program can be used for music composition, as well as for the auditory display of complex data sets—for example, in scientific computing (scientific sonification). The loudness routines in DISCO enable the user to design complex sounds to specified loudness. Additional routines are designed to prevent overflow in the sound file, which would cause ‘‘clipping’’ upon playing, while preserving the relative loudness of all sounds.
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