Analysis and modification of excitation source characteristics for singing voice synthesis

The present article investigates into the use of the LF glottal pulse model for singing synthesis and transformation. A recent estimator of the LF-glottal pulse shape parameter (rd) is used to analyze a small collection of professional singing examples and the results are discussed in the context of recent findings relating the rd shape parameter to other speech signal parameters (intensity and vibrato). We propose a rd shape parameter model for vibrato rendering and present an algorithm that allows modifying the glottal pulse shape parameter of a given speech signal and is used to enhance the vibrato generation in a speech to singing transformation system.