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    11.
    发明专利
    未知

    公开(公告)号：DE69517705T2

    公开(公告)日：2000-11-23

    申请号：DE69517705

    申请日：1995-11-04

    Applicant: IBM

    Inventor： KUNZMANN SIEGFRIED ,  MOHR KARLHEINZ ,  BANDARA UPALI ,  LEWIS L

    IPC: G10L15/183 ,  G10L15/197 ,  G10L15/00 ,  G10L15/22 ,  G10L15/28

    Abstract: PCT No. PCT/EP95/04337 Sec. 371 Date Sep. 25, 1997 Sec. 102(e) Date Sep. 25, 1997 PCT Filed Nov. 4, 1995 PCT Pub. No. WO97/17694 PCT Pub. Date May 15, 1997In this speech recognition system, the size of the language model is reduced by discarding those n-grams that the acoustic part of the system can recognize most accurately without support from a language model. The n-grams can be discarded dynamically during the running of the system or during the build or setup-time of the system. Trigrams occurring infrequently in the text corpora are substituted for the discarded n-grams to increase the accuracy of the word recognitions.

    METHOD AND APPARATUS FOR ADAPTING THE LANGUAGE MODEL'S SIZE IN A SPEECH RECOGNITION SYSTEM
    13.
    发明专利
    METHOD AND APPARATUS FOR ADAPTING THE LANGUAGE MODEL'S SIZE IN A SPEECH RECOGNITION SYSTEM 未知

    公开(公告)号：CA2203132C

    公开(公告)日：2004-11-16

    申请号：CA2203132

    申请日：1995-11-04

    Applicant: IBM

    Inventor： KUNZMANN SIEGFRIED ,  BANDARA UPALI ,  LEWIS BURN L ,  MOHR KARLHEINZ

    IPC: G10L15/183 ,  G10L15/197 ,  G10L9/00 ,  G10L9/18

    Abstract: Disclosed are a method and an apparatus for adapting, particularly reducing, the size of a language model, which comprises word n-grams, in a speech recognition system . The invention provides a mechanism to discard those n-grams for which the acoustic part of the system requires less support from the language model to recognize correctly. The proposed method is suitable for identifying those trigrams in a language model for the purpose of discarding during the built-time of the system. Provided is also another automatic classification scheme for words which allows the compression of a language model, but under retention of accuracy. Moreover it allows an efficient usage of sparsely available text corpora because even singleton trigrams are used when they are helpful. No additiona l software tools are needed to be developed because the main tool, the fast match scoring, is a module readily available in the known recognizers themselves. Further improvement of the method is accomplished by classification of words according to the common text in whic h they occur as far as they distinguish from each other acoustically. The invention opens the possibility to make speech recognition available in low-cost personal computers (PC's), even in portable computers like Laptops.

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