F0 transformation within the voice conversion framework

Abstract

In this paper, several experiments on F0 transformation within the voice conversion framework are presented. The conversion system is based on a probabilistic transformation of line spectral frequencies and residual prediction. Three probabilistic methods of instantaneous F0 transformation are described and compared. Moreover, a new modification of inter-speaker residual prediction is proposed which utilizes the information on target F0 directly during the determination of suitable residuum. Preference listening tests confirmed that this modification outperformed the standard version of residual prediction.