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Journal of the Brazilian Computer Society

Print version ISSN 0104-6500On-line version ISSN 1678-4804

Abstract

FORNARI, José; MAIA JR., Adolfo  and  MANZOLLI, Jônatas. Soundscape design through evolutionary engines. J. Braz. Comp. Soc. [online]. 2008, vol.14, n.3, pp.51-64. ISSN 0104-6500.  http://dx.doi.org/10.1007/BF03192564.

Two implementations of an Evolutionary Sound Synthesis method using the Interaural Time Difference (ITD) and psychoacoustic descriptors are presented here as a way to develop criteria for fitness evaluation. We also explore a relationship between adaptive sound evolution and three soundscape characteristics: key-sounds, key-signals and sound-marks. Sonic Localization Field is defined using a sound attenuation factor and ITD azimuth angle, respectively (Ii, Li). These pairs are used to build Spatial Sound Genotypes (SSG) and they are extracted from a waveform population set. An explanation on how our model was initially written in MATLAB is followed by a recent Pure Data (Pd) implementation. It also elucidates the development and use of: parametric scores, a triplet of psychoacoustic descriptors and the correspondent graphical user interface.

Keywords : sound synthesis; artificial evolution; genetic algorithms; sonic spatialization; acoustic descriptors.

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