Zeros of Z-transform representation with application to source-filter separation in speech

B. Bozkurt , B. Doval (1) , Christophe d'Alessandro (2) , T. Dutoit

1 LIMSI - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur
2 IJLRDA-LAM - Lutheries - Acoustique - Musique

We propose a new spectral representation called the zeros of z-transform (ZZT), which is an all-zero representation of the z-transform of the signal. We show that separate patterns exist in ZZT representations of speech signals for the glottal flow and the vocal tract contributions. A decomposition method for source-tract separation is presented based on ZZT. The ZZT-decomposition consists in grouping the zeros into two sets, according to their location in the z-plane. This type of decomposition leads to separating glottal flow contribution (without a return phase) from vocal tract contribution in the z domain. Index Terms-Glottal flow estimation, source-filter separation, spectral representation, zeros of z-transform (ZZT).

Domaines: Interface homme-machine [cs.HC]; Son [cs.SD]; Traitement du signal et de l'image [eess.SP]; Linguistique; Musique, musicologie et arts de la scène

B. Bozkurt, B. Doval, Christophe d'Alessandro, T. Dutoit. Zeros of Z-transform representation with application to source-filter separation in speech. IEEE Signal Processing Letters, 2005, 12 (4), pp.344-347. ⟨10.1109/lsp.2005.843770⟩. ⟨hal-02008503⟩