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Abstract(s)
As ilusões sonoras sempre exerceram um grande fascínio sobre os seres humanos.
Destas, a que mais nos fascinou e revelou ter maior potencial musical por explorar foi a
Ilusão Sonora da Escala de Shepard. Esta ilusão é uma escala musical dividida em 12
partes iguais, que ao ser escutada gera a sensação de perpetuidade sonora. Pelo facto, de
ser constituída por sons ambíguos (i.e., o Som de Shepard) em termos de percepção de
altura sonora (provavelmente conseguiremos identificar o nome da nota musical do som,
mas teremos muita dificuldade em determinar a oitava a que pertence) permite criar novas
possibilidades de geração de som e de escuta musical. Assim, esta dissertação propõe a
criação de uma fonte sonora baseada no Som de Shepard com o objectivo de ser utilizada
em projectos musicais. Consequentemente, criámos um método de gerar o Som de
Shepard através de uma envolvente espectral alternativa, tanto quanto sabemos, nunca
antes foi usada para reproduzir a respectiva ilusão, mesmo quando esta foi aplicada a uma
melodia constituída por uma sequência de saltos intervalares não regulares. A melodia foi
intitulada de Ilusão Sonora da Melodia Perpétua porque quando é escutada cria a sensação
de perpetuidade sonora como acontece na Ilusão Sonora da Escala de Shepard. Para além
disso, utilizámos a fonte sonora proposta como gerador de som na concepção de um
instrumento digital multimédia e em composição musical.
The auditory illusions have always exerted a great fascination on human beings. Of these, the one that most fascinated us and revealed to have greater musical potential for exploring was the Shepard Scale Illusion. This illusion is a musical scale divided into 12 equal parts. When it is heard it creates the sensation of sonic perpetuity. Being constituted by ambiguous sounds (i.e., Shepard tone) in terms of pitch (it will probably be easy to identify the musical note of the sound, but it will be very difficult to determine the octave that belongs to), allows creating new possibilities of sound generation and musical listening. Thus, this dissertation proposes the creation of a sound source based on Shepard tone with the purpose to be used in musical projects. Consequently, we developed a method to generate the Shepard tone through an alternative spectral envelope, which as far as we know has never been used before to reproduce the Shepard Scale Illusion, even when it was applied to a melody constituted by a sequence of non-regular intervals leaps. The melody was titled Perpetual Melody Auditory Illusion because when it is heard it creates the sensation of sonic perpetuity, as is the case of the Shepard Scale Illusion. Furthermore, we used the proposal sound source as sound generator in the design of a multimedia digital instrument and musical composition.
The auditory illusions have always exerted a great fascination on human beings. Of these, the one that most fascinated us and revealed to have greater musical potential for exploring was the Shepard Scale Illusion. This illusion is a musical scale divided into 12 equal parts. When it is heard it creates the sensation of sonic perpetuity. Being constituted by ambiguous sounds (i.e., Shepard tone) in terms of pitch (it will probably be easy to identify the musical note of the sound, but it will be very difficult to determine the octave that belongs to), allows creating new possibilities of sound generation and musical listening. Thus, this dissertation proposes the creation of a sound source based on Shepard tone with the purpose to be used in musical projects. Consequently, we developed a method to generate the Shepard tone through an alternative spectral envelope, which as far as we know has never been used before to reproduce the Shepard Scale Illusion, even when it was applied to a melody constituted by a sequence of non-regular intervals leaps. The melody was titled Perpetual Melody Auditory Illusion because when it is heard it creates the sensation of sonic perpetuity, as is the case of the Shepard Scale Illusion. Furthermore, we used the proposal sound source as sound generator in the design of a multimedia digital instrument and musical composition.
Description
Keywords
Ilusões Ilusão sonora da escala de Shepard Som de Shepard Curvas de igual percepção de intensidade sonora Filtro A Composição musical digital Composição musical em tempo real Instrumento digital multimédia Interpretação musical com dispositivos electrónicos móveis Pure data Illusions Shepard scale illusion Shepard tone Equal-loudness curves Filter A Digital musical composition Real-time musical composition Multimedia digital instrument Mobile music performance