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Desenvolupament d'un entorn gràfic per a l`anàlisi, transformació i síntesi de sons mitjançant models espectrals

Title Desenvolupament d'un entorn gràfic per a l`anàlisi, transformació i síntesi de sons mitjançant models espectrals
Publication Type Master Thesis
Year of Publication 1997
Authors Bonada, J.
preprint/postprint document files/publications/jboni.pdf
Abstract In this project we have improved certain aspects of the SMS technique and we have written a C++ program that implements it. We used a modular structure of classes based on inheritance which can be used as the basis for building different types of applications. The main technical aspects of SMS that have been improved are (1) a unified synthesis process of the deterministic and stochastic components using a single IFFT, (2) the preservation of phases in the residual component without loosing the possibility of applying time-varying frequency domain filters, (3) the possibility of applying frequency transformations using parabolic interpolation, (4) frequency transpositions maintaining spectral shape, and (5) modification of the peak continuation process of harmonic sounds with a natural stretch by applying a harmonic correction factor. With respect to the implementation, a new file format has been designed using a chunk-based tree structure that goes beyond the current possibilities of the SMS software and it is easily extended