06418431 is referenced by 170 patents and cites 4 patents.

A language model is used in a speech recognition system which has access to a first, smaller data store and a second, larger data store. The language model is adapted by formulating an information retrieval query based on information contained in the first data store and querying the second data store. Information retrieved from the second data store is used in adapting the language model. Also, language models are used in retrieving information from the second data store. Language models are built based on information in the first data store, and based on information in the second data store. The perplexity of a document in the second data store is determined, given the first language model, and given the second language model. Relevancy of the document is determined based upon the first and second perplexities. Documents are retrieved which have a relevancy measure that exceeds a threshold level.

Title
Information retrieval and speech recognition based on language models
Application Number
9/50286
Publication Number
6418431 (B1)
Application Date
March 30, 1998
Publication Date
July 9, 2002
Inventor
Xuedong D Huang
Redmond
WA, US
Milind V Mahajan
Redmond
WA, US
Agent
Westman Champlin & Kelly P A
US
Agent
Joseph R Kelly
US
Assignee
Microsoft Corporation
WA, US
IPC
G06F 17/30
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