Dynamic language modeling for European Portuguese
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| Title: | Dynamic language modeling for European Portuguese |
|---|---|
| Authors: | Martins, Ciro1,2, Teixeira, António1 ajst@ua.pt, Neto, João2 |
| Source: | Computer Speech & Language. Oct2010, Vol. 24 Issue 4, p750-773. 24p. |
| Subjects: | Portuguese language, Dylan (Computer program language), Vocabulary, Speech perception, Language & languages, Syntax (Grammar), Broadcast journalism, Information storage & retrieval systems |
| Abstract: | Abstract: This paper reports on the work done on vocabulary and language model daily adaptation for a European Portuguese broadcast news transcription system. The proposed adaptation framework takes into consideration European Portuguese language characteristics, such as its high level of inflection and complex verbal system. A multi-pass speech recognition framework using contemporary written texts available daily on the Web is proposed. It uses morpho-syntactic knowledge (part-of-speech information) about an in-domain training corpus for daily selection of an optimal vocabulary. Using an information retrieval engine and the ASR hypotheses as query material, relevant documents are extracted from a dynamic and large-size dataset to generate a story-based language model. When applied to a daily and live closed-captioning system of live TV broadcasts, it was shown to be effective, with a relative reduction of out-of-vocabulary word rate (69%) and WER (12.0%) when compared to the results obtained by the baseline system with the same vocabulary size. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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