Aliasing-free implementation of discrete-time glottal source models and their applications to speech synthesis and F0 extractor evaluation

A closed-form representation of anti-aliased L-F model is derived for a LPF function family based on cosine series. The Matlab based implementation of the derived form provides virtually aliasing-free source signal, which is applicable to speech synthesis and F0 extractor evaluation. This aliasing-free representation is also suitable for testing perceptual effects of wave shape parameters in the L-F model, since possible artifacts caused by spurious component are completely removed. A post processing procedure for fine tuning spectral shape is also introduced. An interactive tool for investigating speech production model parameters is designed using this Matlab implementation and will be made freely available.