METHOD FOR CONSTRUCTING DYNAMIC VOCABULARY FOR SPEECH RECOGNIZER USED IN DATABASE FOR INDEXED DOCUMENT

摘要

PROBLEM TO BE SOLVED: To provide a method for constructing a dynamic vocabulary for a speech recognizer used in a database for indexed documents. SOLUTION: A document feature vector is extracted for each document, each feature vector is projected on a low-dimensional document feature vector, and the document is indexed according to the low-dimensional feature vector. A recognizer represents a query by speech as a lattice showing a possible continuous combination of words in the query. The lattice is converted into a secure query vector and further projected on a low-dimensional secure query vector. A search engine searches for a result set in which documents coincide by comparing the low-dimensional feature vector with low-dimensional secure query vectors each. COPYRIGHT: (C)2004,JPO