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篇名
Modeling Cantonese Pronunciation Variations for Large-Vocabulary Continuous Speech Recognition
作者 Lee, Tan (Lee, Tan)Kam, Patgi (Kam, Patgi)Soong, Frank K. (Soong, Frank K.)
中文摘要
This paper presents different methods of handling pronunciation variations in Cantonese large-vocabulary continuous speech recognition. In an LVCSR system, three knowledge sources are involved: a pronunciation lexicon, acoustic models and language models. In addition, a decoding algorithm is used to search for the most likely word sequence. Pronunciation variation can be handled by explicitly modifying the knowledge sources or improving the decoding method. Two types of pronunciation variations are defined, namely, phone changes and sound changes. Phone change means that one phoneme is realized as another phoneme. A sound change happens when the acoustic realization is ambiguous between two phonemes. Phone changes are handled by constructing a pronunciation variation dictionary to include alternative pronunciations at the lexical level or dynamically expanding the search space to include those pronunciation variants. Sound changes are handled by adjusting the acoustic models through sharing or adaptation of the Gaussian mixture components. Experimental results show that the use of a pronunciation variation dictionary and the method of dynamic search space expansion can improve speech recognition performance substantially. The methods of acoustic model refinement were found to be relatively less effective in our experiments.
起訖頁 17-35
關鍵詞 Automatic speech recognitionPronunciation variationCantonese
刊名 中文計算語言學期刊  
期數 200603 (11:1期)
出版單位 中華民國計算語言學學會
該期刊-上一篇 Using Duration Information in Cantonese Connected-Digit Recognition
該期刊-下一篇 A Maximum Entropy Approach for Semantic Language Modeling
 

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