Clustering of context dependent speech units for multilingual speech recognition
Imperl, Bojan
The paper addresses the problem of designing a language independent phonetic inventory for the speech recognisers with multilingual vocabulary. A new clustering algorithm for the definition of ...multilingual set of triphones is proposed. The clustering algorithm bases on a definition of a distance measure for triphones defined as a weighted sum of explicit estimates of the context similary on a monophone level. The monophone similarity estimation method based on the algorithm of Houtgast. The clustering algorithm is integrated in a multilingual speech recognition system based on HTK V2.1.1. The experiments were based on the SpeechDat II databases. So far, experiments included the Slovenian, Spanish and German 1000 FDB SpeechDat (II) databases. Experiments have shown that the use of clustering algorithm results in a significant reduction of the number of triphones with minor degradation of word accuracy.
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