Análise musical de peças acusmáticas com suporte de descritores psicoacústicos

Abstract

This article presents an exploratory study in musical analysis with a focus on perceptual phenomena. The development of computational models of the last century afforded the study of perceptual phenomena through technological devices, which eventually became supports for music creation and analysis. Current studies focus on the application of computational tools in the context of systematic musicology. To study two acousmatic pieces composed by the authors, the text updates this discussion based on the psychoacoustics theoretical framework. We present the compositional sound material, focused on speculations about equal-tempered scales and its psychoacoustic consequences based on roughness models. To focus on aspects of musical texture, we use the following audio descriptors: the spectral irregularity, as a tool to represent microtemporal phenomena, such as roughness; the bark coefficients, to understand the development of texture in the frequency domain; and sharpness, to represent a quantitative measure of perception of density. As a result, we present graphical representations, with contextualized and comparative analyzes of the two pieces. We analyze and interpret the sound phenomena described in the graphic representations as emergent perceptual structures. Finally, we discuss the potential of new perspectives for musical analysis based on perceptual models.