Adolfo Maia

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A mathematical model for interactive sound synthesis based on the application of Genetic Algorithms (GA) is presented. The Evolutionary Sound Synthesis Method (ESSynth) generates sequences of waveform variants by the application of genetic operators on an initial population of waveforms. We describe how the waveforms can be treated as genetic code, the(More)
In this paper we introduce a new model for granular synthesis using Markov Chains and Fuzzy Sets. Whereas Markov Chains are used to control the evolution of the sound in time, Fuzzy Sets are employed to define the internal structure of the sound grains. We provide the mathematical foundations of the model and briefly discuss the implementation of a(More)
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: keysounds, key-signals and sound-marks. Sonic(More)
A new way to control sound spatial dispersion using the ESSynth Method is introduced here. The Interaural Time Difference (ITD) is used as genotype of an evolutionary control of sound spatialization. Sound intensity and the ITD azimuth angle are used to define spatial dispersion and spatial similarity. Experimental results where crossover and mutation rates(More)
This paper presents a new model for measuring similarity in a general Rhythm Space. Similarity is measured by establishing a comparison between subsequences of a given rhythm. We introduce the hierarchical subdivision of rhythm sequences in several levels, and compute a Distance Matrix for each level using the " block distance ". The information about the(More)
We investigate a possible difference between the effective potential and zero-point energy. We define the zero-point ambiguity (ZPA) as the difference between these two definitions of vacuum energy. Using the zeta function technique in order to obtain renormalized quantities , we show that ZPA vanishes, implying that both of the above definitions of vacuum(More)
Part of the University of Campinas (UNICAMP,, the Interdisciplinary Nucleus of Sound Communication (NICS, was founded in 1983 by the composer Raul do Valle and collaborators. Since then, NICS has maintainined a longstanding list of participations in the academic and artistic musical scenario, specially the ones(More)
We present an interactive sound spatialization and synthesis system based on Interaural Time Difference (ITD) model and Evolutionary Computation. We define <i>a Sonic Localization Field</i> using sound attenuation and ITD azimuth angle parameters and, in order to control an adaptive algorithm, we used pairs of these parameters as <i>Spatial Sound Genotypes(More)
The calculation of the minimum of the effective potential using the zeta function method is extremely advantagous, because the zeta function is regular at s = 0 and we gain immediately a finite result for the effective potential without the necessity of subtratction of any pole or the addition of infinite counter-terms. The purpose of this paper is to(More)
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