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Evaluation of delexicalization methods for research on emotional speech

Audibert, Nicolas, Carbone, Francesca, Champagne-Lavau, Maud, Said Housseini, Aurélien, Petrone, Caterina (2023) Evaluation of delexicalization methods for research on emotional speech. In: INTERSPEECH 2023. . pp. 2618-2622. Interspeech, Dublin, Ireland (doi:10.21437/Interspeech.2023-1903) (KAR id:104715)


Perceptual evaluation of non-controlled emotional speech requires delexicalization to neutralize semantic variation. However, most existing methods imply losing spectral cues crucial to emotional attribution, related to both laryngeal and supralaryngeal settings. We propose a method relying on voice morphing to retain part of the spectral information of the original stimuli, as an additional step to diphone synthesis delexicalization. After previous assessment of intelligibility loss, this study evaluates the naturalness of angry and neutral expressions in French films, delexicalized using low-pass filtering and the proposed method implemented with MBROLA and STRAIGHT. Results show that morphing-based delexicalization, which leads to accurate emotional attribution, is rated with a higher degree of naturalness than low-pass filtering. Implications for research in affective speech are discussed with regards to other delexicalization methods proposed in the literature.

Item Type: Conference or workshop item (Proceeding)
DOI/Identification number: 10.21437/Interspeech.2023-1903
Uncontrolled keywords: delexicalization, emotion, prosody, voice quality, perception
Divisions: Divisions > Division of Human and Social Sciences > School of Psychology
Funders: Aix-Marseille University (
Depositing User: Francesca Carbone
Date Deposited: 24 Jan 2024 08:15 UTC
Last Modified: 26 Jan 2024 12:44 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Carbone, Francesca.

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