LREC 2000 - Papers

LREC 2000 2^nd International Conference on Language Resources & Evaluation

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Title Perceptual Evaluation of Text-to-Speech Implementation of Enclitic Stress in Greek

Authors Fotinea Stavroula-Evita (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece, evita@ilsp.gr)
Protopapas Athanassios (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece)
Dimitriadis Dimitris (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece)
Carayannis George (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece, gcara@ilsp.gr)

Keywords Perceptual Evaluation, Prosody, Speech Synthesis, Stress, Text-To-Speech

Session Session SP1 - Phonetic Issues and Speech Synthesis

Abstract This paper presents a perceptual evaluation of a text to speech (TTS) synthesizer in Greek with respect to acoustic registration of enclitic stress and related naturalness and intelligibility. Based on acoustical measurements and observations of naturally recorded utterances, the corresponding output of a commercially available formant-based speech synthesizer was altered and the results were subjected to perceptual evaluation. Pitch curve, intensity, and duration of the syllable bearing enclitic stress, were acoustically manipulated, while a phonetically identical phrase contrasting only in stress served as control stimulus. Ten listeners judged the perceived naturalness and preference (in pairs) and the stress pattern of each variant of a base phrase. It was found that intensity modification adversely affected perceived naturalness while increasing perceived stress prominence. Duration modification had no appreciable effect. Pitch curve modification tended to produce an improvement in perceived naturalness and preference but the results failed to achieve statistical significance. The results indicated that the current prosodic module of the speech synthesizer reflects a good balance between prominence of stress assignment, intelligibility, and naturalness.

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Title	Perceptual Evaluation of Text-to-Speech Implementation of Enclitic Stress in Greek
Authors	Fotinea Stavroula-Evita (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece, evita@ilsp.gr) Protopapas Athanassios (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece) Dimitriadis Dimitris (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece) Carayannis George (Institute for Language and Speech Processing, Epidavrou & Artemidos 6, 151 25 Maroussi, Greece, gcara@ilsp.gr)
Keywords	Perceptual Evaluation, Prosody, Speech Synthesis, Stress, Text-To-Speech
Session	Session SP1 - Phonetic Issues and Speech Synthesis
Abstract	This paper presents a perceptual evaluation of a text to speech (TTS) synthesizer in Greek with respect to acoustic registration of enclitic stress and related naturalness and intelligibility. Based on acoustical measurements and observations of naturally recorded utterances, the corresponding output of a commercially available formant-based speech synthesizer was altered and the results were subjected to perceptual evaluation. Pitch curve, intensity, and duration of the syllable bearing enclitic stress, were acoustically manipulated, while a phonetically identical phrase contrasting only in stress served as control stimulus. Ten listeners judged the perceived naturalness and preference (in pairs) and the stress pattern of each variant of a base phrase. It was found that intensity modification adversely affected perceived naturalness while increasing perceived stress prominence. Duration modification had no appreciable effect. Pitch curve modification tended to produce an improvement in perceived naturalness and preference but the results failed to achieve statistical significance. The results indicated that the current prosodic module of the speech synthesizer reflects a good balance between prominence of stress assignment, intelligibility, and naturalness.