Apparatus and method for reducing speech recognition vocabulary perplexity and dynamically selecting acoustic models

Abstract From the Canadian patent

A method of reducing the perplexity of a speech recognition vocabulary and dynamically selecting speech recognition acoustic model sets used in a simulated telephone operator apparatus. The directory of users of the telephone network is subdivided into subsets wherein each subset contains the names of users within a certain location or exchange. A speech recognition vocabulary database is compiled for each subset and the appropriate database is loaded into the speech recognition apparatus in response to a requested call to the location covered by the subset. Furthermore a site-specific , acoustic model set is dynamically loaded according to the location of a calling party. An …