| 摘要 |
PURPOSE: A device for guiding living information using a two step keyword recognizing method is provided to recognize a keyword through two stages by dividing keywords according to classes, dividing keywords which represent each class into a class keyword and a sub class keyword. CONSTITUTION: A voice feature extracting unit(100) extracts a feature from a filtered and quantized voice signal with respect to a voice signal inputted through a microphone(9). The first stage keyword recognition unit(200) extracts the first stage class keyword from the feature. A second stage keyword recognition unit(300) extracts a sub class keyword possessed in the class keyword. A recognition result combining unit(21) combines recognition languages of the first stage keyword recognition unit(200) and the second stage keyword recognition unit(300) and outputs the combined recognition languages. The first stage class keyword extracting recognition unit(14) progresses a viterbi process using a class keyword model(13) and filler models(15). If an accumulated probability value of the class keyword model(13) and a probability value in the filler model(15) with respect to a searched section are larger than a critical value, the first stage class keyword extracting recognition unit(14) extracts a class keyword. A recognition unit(16) judges whether the class keyword extracted in the first stage class keyword extracting recognition unit(14) is recognized or rejected, and recognizes or rejects the class keyword.
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