Efectos Vocales Extremos

Pompeu Fabra University

Master’s Thesis Voice Transformations for Extreme Vocal Effects

Author: Oriol Nieto

Supervisor: Jordi Bonada

Master’s Thesis submitted in partial fulfillment of the requirements for the degree: Master’s in Information Technologies, Communications and Audiovisuals

September 14, 2008

Voice Transformations for Extreme Vocal Effects by Oriol Nieto is licensedunder a Creative Commons Attribution-Non-Commercial-No Derivative Works 2.5 Spain License. http://creativecommons.org/licenses/by-nc-nd/2.5/es/

Abstract

Extreme Vocal Effects in music are so recent that few studies have been carried out about how they are physiologically produced and whether they are harmful or not for the human voice [1][2]. Voice Transformations in real-time are possiblenowadays thanks to new technologies and voice processing algorithms [3]. This Master’s Thesis pretends to define and classify these new singing techniques and to create a mapping between the physiological aspect of each EVE to its relative spectrum variations. Voice Transformation Models based on these mappings are proposed and discussed for each one of these EVEs. We also discuss differenttransformation methods and strategies in order to obtain better results. A subjective evaluation of the results of the transformations is also presented and discussed along with further work, improvements, and working lines on this field.

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Resum

Els Efectes de Veu Extrems en la m´sica s´n tan recents que pocs estudis han estat portats a terme u o sobre com es produeixen fisiol`gicament i si s´nrealment dolents per a les cordes vocals o no [1][2]. o o Les transformacions de veu a temps real s´n possibles avui en dia gr`cies a les noves tecnologies i o a als nous algoritmes de processament de veu [3]. Aquesta tesi pret´n definir i classificar aquestes noves e t`cniques de cant extremes i crear una relaci´ entre els aspectes fisiol`gics de cada EVE amb les seves e o o respetives variacions del’espectre. Es proposen i es discuteixen Models de Transformaci´ de Veu basats en aquestes relacions per a o cadascun d’aquests EVEs. Tamb´ es discuteixen diferents m`todes i estrat`gies de transformaci´ per e e e o tal d’obtenir millors resultats. Tamb´ es presenta i es discuteix una avaluaci´ dels resultats de les transformacions junt amb e o futurs treballs, millores i guies de treball en aquestcamp.

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Resumen

Los Efectos de Voz Extremos en la m´sica son tan recientes que pocos estudios se han realizado u sobre c´mo se producen fisiol´gicamente y si son realmente da˜inos para las cuerdas vocales o no [1][2]. o o n Las transformaciones de voz a tiempo real son posibles hoy en dia gracias a las nuevas tecnolog´ ıas y a los nuevos algoritmos de procesamiento de voz [3]. Esta tesispretende definir y clasificar estas nuevas t´cnicas de canto extremas y crear una relaci´n entre los aspectos fisiol´gicos de cada EVE con e o o sus respectivas variaciones espectrales. Se proponen y se discuten Modelos de Transformaci´n de Voz basados en estas relaciones para o cada uno de estos EVEs. Tambi´n se discuten diferentes m´todos y estrategias de transformaci´n por e e o tal de obtenermejores resultados. Tambi´n se presenta y se discute una evaluaci´n de los resultados de las transformaciones junto e o con futuros trabajos, mejoras y gu´ de trabajo en este campo. ıas

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One thing I’ve learned. You can know anything. It’s all there. You just have to find it.

Neil Gaiman

Preface
This Master’s Thesis has been carried out in the Music Technology Group as the final part ofmy Master’s in Information Technologies, Communications and Audiovisuals in the Pompeu Fabra University, Barcelona. It has been supervised by Jordi Bonada, and it would have been impossible to do it without his invaluable help. I want to thank him so much for all this huge effort and dedication he put in this project. I would also like to specially thank Xavier Serra, for tutoring me during the...