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US 4,053,710 AGranted
Automatic speaker verification systems employing moment invariants
AssigneeNCR Corporation
InventorsJeram G. Advani, Bruno J. Paganini, William J. Hale
Life of this patent
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Abstract
An electrical voice print is converted into sampled digital values which are converted into corresponding moment invariants (MI). A comparison of the moment invariant values of a standard phrase uttered by the same person and stored in the storage means against the most recently converted moment invariants determines the degree of correlation. A high degree of correlation is indicative of a voice match.
Claims16
The method of verifying the identity of a person by the use of utterance comparisons comprising the steps of:
- a. computing an utterance vector from samples of the person's speech;
- b. computing an utterance vector from samples of an imposter's speech;
- c. analyzing the computed utterance vector of the person and the computed utterance vector of the imposter for deriving weighting factors indicative of the differences therebetween;
- d. recording the person's computed utterance vector and said weighting factors on a security card that is issued to said person;
- e. comparing the utterance vector recorded on said security card against a most recent computed utterance vector from the person for determining the differences therebetween;
- f. comparing the differences determined in step (e) with said recorded weighting factors and verifying the identity of said person if the comparison is within a first range and rejecting the identity of said person if the comparison is within a second range.
3 more elements
The method of verifying the identity of a person by the use of reference utterances comprising:
- a. computing said reference utterance from sets of moment invariants developed from a plurality of different utterances of a phrase by said person;
- b. computing a plurality of imposter utterance vectors from sets of moment invariants developed from a plurality of different utterances of a phrase by a plurality of imposters;
- c. computing an error weighting function of the differences between said reference utterance and said imposter utterance and setting a threshold for acceptance of verification as a function of error in verification;
- and
- d. verifying the identity of said person when the reference utterance is above the set threshold.
2 more elements
A system for verifying the identity of an electrical signal comprising:
- means for providing a representation of sampled amplitude values of said electrical signal;
- means for computing moment invariants from said sampled amplitude values;
- storage means for storing a plurality of computed moment invariants representative of imposter electrical signals;
- analyzing means for computing weighting functions indicative of the differences between computed imposter moment invariants and the first named computed moment invariants;
- recording means for recording the computed first named moment invariants and the weighting functions therefor;
- and
- means for accepting the identity of said electrical signal when moment invariants computed from a non-recorded electrical signal compare with the recorded moment invariants within limits established by said weighting functions.
4 more elements
A system for verifying the identity of a person from an utterance of a reference phrase comprising:
- a. means for transforming said uttered reference phrase into electrical signals;
- b. means for sampling said electrical signals and for converting the samples into amplitude values;
- c. means for operating upon said amplitude values for computing identity moment invariants of said amplitude values;
- d. means for storing said identity moment invariants;
- e. means for storing a plurality of moment invariants corresponding to reference phrases uttered by imposters;
- f. analyzing means operatively connected to said means for storing said identity moment invariants and said means for storing a plurality of imposter moment invariants for deriving factors indicative of the differences therebetween;
- and
- g. means for recording said identity moment invariants and said derived factors whereby identity of a person is established by comparing the computed identity moment invariants of a reference phrase uttered at a later time against the recorded identity moment invariant when the differences therebetween compare favorably with said derived factors.
5 more elements
A system for verifying the identity of an individual by comparing the individual's previously recorded utterance against a non-recorded utterance and verifying the individual's identity if the comparison is favorable, said system comprising:
- means for providing a representation of sampled amplitude values of the individual's utterance;
- means for computing moment invariants from said sampled amplitude values;
- storage means for storing a plurality of computed moment invariants representative of imposter utterances;
- analyzing means for computing weighting functions indicative of the differences between computed imposter moment invariants and computed individual moment invariants;
- recording means for recording the computed individual moment invariants and the weighting functions therefor;
- and
- means for accepting the identity of said individual when moment invariants computed from an individual's non-recorded utterance compare with the recorded moment invariants within limits established by said weighting functions.
4 more elements
A system for verifying the identity of a person by the use of utterance comparisons comprising:
- means for converting an utterance into a corresponding electrical signal;
- means for providing representations of sampled amplitude values of said corresponding electrical signals;
- means for computing moment invariants from said provided representations;
- memory means for storing said computed moment invariants;
- means for storing a plurality of computed moment invariants corresponding to imposter utterances;
- analyzing means for computing weighting functions indicative of the differences between the moment invariants of the person to be identified and those of an imposter;
- means for comparing subsequent computed moment invariants of the person against previously computed moment invariants for providing representations of the differences therebetween;
- and
- means for comparing said provided difference representations against said computed weighting functions and for providing an acceptance indication when said differences are within acceptable magnitudes.
6 more elements
Dependencies are inferred from the claim text.