Speech recognition word dictionary/language model making system, method, and program, and speech recognition system

• US 20090106023A1
• Filed: 11/30/2007
• Published: 04/23/2009
• Est. Priority Date: 05/31/2006
• Status: Abandoned Application

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Miki, Kiyokazu
• Application Number:
  US12/227,331
• Publication Number:
  US 20090106023A1
• Time in Patent Office: Days
• US Class Current: 704/245
• CPC Class Codes: G10L 15/183 using context dependencies, e.g. language models
• CPC Class Codes: G10L 2015/0631 Creating reference templates; Clustering

Abstract

A speech recognition word dictionary/language model making system for creating a word dictionary for recognizing a word not appearing in a learning text by selecting a word-generation-model-learning-method-by-word-class according to the word to be added which does not appear in the learning text and for making a language model. The speech recognition word dictionary/language model making system (100) includes a language model estimating device (111) for selecting estimating method information from a learning-method-knowledge-by-word-class storing section (109) for each word class of an addition word generating model which is a word generating model of the addition word according to the selected estimating method information and a database combining device (112) for adding an addition word to a word dictionary (105) and adding an addition word generating model to a word-generation-model-by-word-class database (107).

Claims

1-28. -28. (canceled)

29. A speech recognition word dictionary/language model making system, comprising a speech recognition word dictionary, a word-generation-model-by-word-class database, and a learning-method-knowledge database to which a plurality of pieces of distribution-form information showing distribution forms of word generation probabilities are stored in advance, wherein the system comprises:

a language model estimating device which selects the distribution-form information that matches best with the distribution forms of each of the classes of words contained in a learning text from the distribution-form information contained in the learning-method-knowledge database, and creates, for each of the classes, an addition word generation model as a word generation model of the addition words that comprise words not appearing in a learning text according to the selected distribution-form information; and

a database combining device which adds the addition words to the word dictionary and adds the addition word generation models to the word-generation-model-by-word-class database.

30. The speech recognition word dictionary/language model making system as claimed in claim 29, wherein the distribution-form information includes uniform distribution.

31. The speech recognition word dictionary/language model making system as claimed in claim 29, wherein the distribution-form information includes prescribed prior distribution.

32. The speech recognition word dictionary/language model making system as claimed in claim 29, wherein a part of speech is used as the word class.

33. The speech recognition word dictionary/language model making system as claimed in claim 29, wherein a part of speech acquired by conducting a morphological analysis of the words is used as the word class.

34. The speech recognition word dictionary/language model making system as claimed in claim 29, wherein a class acquired by conducting automatic clustering of the words is used as the word class.

35. A speech recognition word dictionary/language model making system, comprising a speech recognition word dictionary, a word-generation-model-by-word-class database, and a learning-method-knowledge database to which a plurality of pieces of distribution-form information showing distribution forms of word generation probabilities are stored in advance, wherein the system comprises:

language model estimating means for selecting the distribution-form information that matches best with the distribution forms of each of the classes of words contained in a learning text from the distribution-form information contained in the learning-method-knowledge database, and creating, for each of the classes, an addition word generation model as a word generation model of the addition words that comprise words not appearing in a learning text according to the selected distribution-form information; and

database combining means for adding the addition words to the word dictionary and adding the addition word generation models to the word-generation-model-by-word-class database.

36. A speech recognition word dictionary/language model making method, which comprises:

selecting distribution-form information that matches best with distribution forms of each class of words contained in a learning text from a learning-method knowledge database to which a plurality of pieces of the distribution-form information showing distribution forms of word generation probabilities are stored in advance;

creating, for each of the classes, an addition word generation model as a word generation model of addition words that comprise words not appearing in a learning text according to the selected distribution-form information; and

adding the addition words to the word dictionary and adding the addition word generation models to the word-generation-model-by-word-class database.

37. The speech recognition word dictionary/language model making method as claimed in claim 36, wherein the distribution-form information includes uniform distribution.

38. The speech recognition word dictionary/language model making method as claimed in claim 36, wherein the distribution-form information includes prescribed prior distribution.

39. The speech recognition word dictionary/language model making method as claimed in claim 36, wherein a part of speech is used as the word class.

40. The speech recognition word dictionary/language model making method as claimed in claim 36, wherein a part of speech acquired by conducting a morphological analysis of the words is used as the word class.

41. The speech recognition word dictionary/language model making method as claimed in claim 36, wherein a class acquired by conducting automatic clustering of the words is used as the word class.

42. A speech recognition system which uses the speech recognition word dictionary and the word-generation-model-by-word-class database created by the method claimed in claim 36.

43. A computer readable recording medium storing a speech recognition word dictionary/language model making program for enabling a computer to execute:

processing for selecting distribution-form information that matches best with distribution forms of each class of words contained in a learning text from a learning-method-knowledge database to which a plurality of pieces of the distribution-form information showing distribution forms of word generation probabilities are stored in advance;

processing for creating, for each of the classes, an addition word generation model as a word generation model of the addition words that comprise words not appearing in a learning text according to the selected distribution-form information; and

processing for adding the addition words to the word dictionary and adding the addition word generation models to the word-generation-model-by-word-class database.

44. A computer readable recording medium storing the speech recognition word dictionary/language model making program as claimed in claim 43, wherein the distribution-form information includes uniform distribution.

45. A computer readable recording medium storing the speech recognition word dictionary/language model making program as claimed in claim 43, wherein the distribution-form information includes prescribed prior distribution.

46. A computer readable recording medium storing the speech recognition word dictionary/language model making program as claimed in claim 43, wherein a part of speech is used as the word class.

47. A computer readable recording medium storing the speech recognition word dictionary/language model making program as claimed in claim 43, wherein a part of speech acquired by conducting a morphological analysis of the words is used as the word class.

48. A computer readable recording medium storing the speech recognition word dictionary/language model making program as claimed in claim 43, wherein a class acquired by conducting automatic clustering of the words is used as the word class.