FIT Božetěchova 2, seminární místnost UPGM L220 25.9.2008

In this seminar, we propose a novel approach which merges the favourite traditional sinusoidal model (sinusoidal model) and extends a recent DCT (Discrete Cosine Transform) based pitch modification algorithm. The product is a powerful algorithm that can be applied to any periodic or quasi periodic waveform for time scale and/or pitch modification purposes. The proposed algorithm has several advantages: i) Since DCT does not have the explicit phase information, one does not need the cubic spline interpolation of the phase component of the sinusoidal model. ii) The parameters to be interpolated can be reduced because of the energy packing efficiency of the DCT. This is particularly important if signal synthesis is carried out on a remote location from the transmitted parameters.