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US 6,272,463 B1Granted
Multi-resolution system and method for speaker verification
AssigneeLernout & Hauspie Speech Products N.V.
InventorMartine Lapere
Life of this patent
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Abstract
A method is given for generating a speaker-dependant model of an utterance that has at least one occurrence. The method includes generating an initial model, having a first resolution, that encodes each of the occurrences of the utterance; and generating at least one additional speaker-specific model, having a different resolution from that of the initial model, of all occurrences of the utterance.
Claims12
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;
- and
- a 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.
7 more elements
A method of speaker verification comprising:
- establishing a database of high resolution word models containing word models associated with each authorized user;
- generating a verification phrase with a verification phrase generator in communication with the database of high resolution word models 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;
- generating a comparison model of the verification phrase with a verification phrase model generator in communication with the verification phrase generator;
- communicating the verification phrase to the user with a user access device in communication with the grammar compiler that allows a spoken response phrase having words to be provided by the user;
- checking the words in the response phrase for acoustic similarity and continuity with an anti-synthesis comparator to determine if the response phrase was produced by natural speech;
- and
- verifying the user as the specific authorized user with a verification engine in communication with the user access device and the verification model generator 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 response phrase has been determined by the anti-synthesis comparator to be produced by natural speech.
7 more elements
Dependencies are inferred from the claim text.