EUROSPEECH 2003 - INTERSPEECH 2003
8th European Conference on Speech Communication and Technology

Geneva, Switzerland
September 1-4, 2003

        

Voice Conversion Methods for Vocal Tract and Pitch Contour Modification

Oytun Turk (1), Levent M. Arslan (2)

(1) Sestek Inc., Turkey
(2) Bogazici University, Turkey

This study^1 proposes two new methods for detailed modeling and transformation of the vocal tract spectrum and the pitch contour. The first method (selective pre-emphasis) relies on band-pass filtering to perform vocal tract transformation. The second method (segmental pitch contour model) focuses on a more detailed modeling of pitch contours. Both methods are utilized in the design of a voice conversion algorithm based on codebook mapping. We compare them with existing vocal tract and pitch contour transformation methods and acoustic feature transplantations in subjective tests. The performance of the selective pre-emphasis based method is similar to the methods used in our previous work at higher sampling rates with a lower prediction order. The results also indicate that the segmental pitch contour model improves voice conversion performance. Bu calismada, girtlak yapisi ve ses perdesinin daha ayrintili bicimde modellenmesi ve bir konusmacidan digerine donusturulmesi icin iki yeni yontem sunulmaktadir. Secimli on vurgulama olarak adlandirilan birinci yontem, girtlak yapisi donusumu icin bant-geciren suzgecleme kullanmaktadir. Ikinci yontem ses perdesinin zamanla degisim egrisini modellemek icin parcali bir model onermektedir. Her iki yontem, yeni bir konusmaci donusturme algoritmasinda kullanilmistir. Yontemler, oznel deneyler yoluyla halen kullanilan girtlak yapisi ve ses perdesi donusturme yontemleriyle karsilastirilmistir. Secimli on vurgulama yonteminin yuksek ornekleme sikliklari icin daha dusuk kestirim derecelerinde onceki calismalarimizdaki yontemlere benzer sonuc verdigi gosterilmistir. Sonuclar, parcali ses perdesi modelinin konusmaci donusumunde performansi arttirdigini gostermektedir.

Full Paper

Bibliographic reference.  Turk, Oytun / Arslan, Levent M. (2003): "Voice conversion methods for vocal tract and pitch contour modification", In EUROSPEECH-2003, 2845-2848.