发明授权
- 专利标题: Method and apparatus for estimating phone class probabilities a-posteriori using a decision tree
- 专利标题(中): 用于使用决策树估计电话类概率的方法和装置
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申请号: US312584申请日: 1994-09-27
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公开(公告)号: US5680509A公开(公告)日: 1997-10-21
- 发明人: Ponani S. Gopalakrishnan , David Nahamoo , Mukund Padmanabhan , Michael Alan Picheny
- 申请人: Ponani S. Gopalakrishnan , David Nahamoo , Mukund Padmanabhan , Michael Alan Picheny
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: G10L15/06
- IPC分类号: G10L15/06 ; G10L15/08 ; G10L5/06
摘要:
A method and apparatus for estimating the probability of phones, a-posteriori, in the context of not only the acoustic feature at that time, but also the acoustic features in the vicinity of the current time, and its use in cutting down the search-space in a speech recognition system. The method constructs and uses a decision tree, with the predictors of the decision tree being the vector-quantized acoustic feature vectors at the current time, and in the vicinity of the current time. The process starts with an enumeration of all (predictor, class) events in the training data at the root node, and successively partitions the data at a node according to the most informative split at that node. An iterative algorithm is used to design the binary partitioning. After the construction of the tree is completed, the probability distribution of the predicted class is stored at all of its terminal leaves. The decision tree is used during the decoding process by tracing a path down to one of its leaves, based on the answers to binary questions about the vector-quantized acoustic feature vector at the current time and its vicinity.
公开/授权文献
- USD317849S Cutting board 公开/授权日:1991-07-02