Patent ID: 8412521
Filing Date: 2013-04-02
Classification: G06F,G10L

Abstract:
1. In a computer system including a first document tangibly stored in a first computer-readable medium and containing at least some information in common with a spoken audio stream, a method performed by at least one computer processor executing computer program instructions tangibly stored in a second computer-readable medium, the method comprising steps of: (A) identifying first text tangibly stored in the first document on a third computer-readable medium, wherein the first text represents a first instance of a concept; (B) identifying, based on the identified first text, a first plurality of at least three spoken forms of the first instance of the concept, including at least one spoken form not contained in the first document; (C) replacing the identified first text with a first context-free grammar specifying the first plurality of spoken forms of the first instance of the concept to produce a second document tangibly stored in a fourth computer-readable medium; (D) identifying second text tangibly stored in the first document on the third computer-readable medium, wherein the second text represents a second instance of the concept; (E) identifying, based on the identified second text, a second plurality of at least three spoken forms of the second instance of the concept, wherein the first plurality of spoken forms differs from the second plurality of spoken forms; (F) replacing the identified second text with a second context-free grammar specifying the second plurality of spoken forms of the second instance of the concept within the second document; (G) generating a first language model, tangibly stored in a fifth computer-readable medium, based on the second document; (H) using the first language model in a speech recognition process to recognize the spoken audio stream and thereby to produce a third document tangibly stored in a sixth computer-readable medium; (I) filtering text from the third document by reference to the second document to produce a filtered document, tangibly stored in a seventh computer-readable medium, in which text filtered from the third document is marked as unreliable; and (J) using the filtered document and the spoken audio stream to train an acoustic model, tangibly stored in an eighth computer-readable medium, by performing steps of: