TAILIEUCHUNG - Báo cáo khoa học: "Phonological Constraints and Morphological Preprocessing for Grapheme-to-Phoneme Conversion"

Grapheme-to-phoneme conversion (g2p) is a core component of any text-to-speech system. We show that adding simple syllabification and stress assignment constraints, namely ‘one nucleus per syllable’ and ‘one main stress per word’, to a joint n-gram model for g2p conversion leads to a dramatic improvement in conversion accuracy. Secondly, we assessed morphological preprocessing for g2p conversion. While morphological information has been incorporated in some past systems, its contribution has never been quantitatively assessed for German. . | Phonological Constraints and Morphological Preprocessing for Grapheme-to-Phoneme Conversion Vera Demberg School of Informatics University of Edinburgh Edinburgh EH8 9LW Gb Helmut Schmid IMS University of Stuttgart D-70174 Stuttgart schmid@ Gregor Mohler Speech Technologies IBM Deutschland Entwicklung D-71072 Boblingen moehler@ Abstract Grapheme-to-phoneme conversion g2p is a core component of any text-to-speech system. We show that adding simple syllabification and stress assignment constraints namely one nucleus per syllable and one main stress per word to a joint n-gram model for g2p conversion leads to a dramatic improvement in conversion accuracy. Secondly we assessed morphological preprocessing for g2p conversion. While morphological information has been incorporated in some past systems its contribution has never been quantitatively assessed for German. We compare the relevance of morphological preprocessing with respect to the morphological segmentation method training set size the g2p conversion algorithm and two languages English and German. 1 Introduction Grapheme-to-Phoneme conversion g2p is the task of converting a word from its spelling . Stern-anisol Engl star-anise oil to its pronunciation Z temPaniisPpilZ . Speech synthesis modules with a g2p component are used in text-to-speech TTS systems and can be be applied in spoken dialogue systems or speech-to-speech translation systems. Syllabification and Stress in g2p conversion In order to correctly synthesize a word it is not only necessary to convert the letters into phonemes but also to syllabify the word and to assign word stress. 96 The problems of word phonemization syllabification and word stress assignment are inter-dependent. Information about the position of a syllable boundary helps grapheme-to-phoneme conversion. Marchand and Damper 2005 report a word error rate WER reduction of approx. 5 percentage points for English when the letter

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