Patent ID: 6272463
Filing Date: 2001-08-07
Classification: G10L

Abstract:
A multi-resolution model speaker verification system having at least one authorized user, the system comprising:a database of high resolution word models containing word models associated with each authorized user;a verification phrase generator in communication with the database of high resolution word models that generates a verification phrase when a user seeks to be verified as a specific authorized user, the verification phrase containing at least one key word having a model in the database of high resolution models, and at least one other word;a verification phrase model generator in communication with the verification phrase generator that generates a comparison model of the verification phrase;a user access device in communication with the verification phrase generator that communicates the verification phrase to the user and that allows a spoken response phrase having words to be provided by the user;an anti-synthesis comparator that checks the response phrase for acoustic similarity and continuity to determine if the response phrase was produced by natural speech; anda verification engine in communication with the user access device, the anti-synthesis comparator, and the verification phrase model generator that verifies the user as the specific authorized user when:(i) the response phrase matches the comparison model,(ii) for the at least one key word, the models in the database of high resolution word models that are associated with the specific authorized user are within a threshold distance of corresponding words in the response phrase, and(iii) the anti-synthesis comparator determines that the response phrase was produced by natural speech.