Speaker authentication utilizing a plurality of words as a speech sample input

Claim 3

A method iN accordance with claim 1 including the step of normalizing the integrated trial signals to form normalized trial signals which are compared to the standard signals.

Claim 4

A method in accordance with claim 1 including generating the standard signals for the legitimate person by separating the legitimate speech sample into a plurality of frequency bands, integrating the magnitude of the respective frequency bands of the legitimate speech sample over the duration of the standard speech to form said standard signals, and recording the magnitudes of said standard signals.

Claim 5

A method in accordance with claim 3 including the step of normalizing the standard signals by uniformly adjusting their respective magnitudes so that the sum of their magnitudes is a predetermined value.

Claim 6

A talker authentication system for analyzing speech of a trial talker in order to determine whether the trial talker is legitimate or an imposter comprising input means adapted to receive a speech sample of a predetermined plurality of words and generate an electrical speech signal in response thereto, a plurality of filter networks for separating said electrical speech signal into a plurality of frequency band signals, integration means for integrating each of said frequency band signals over the entire duration of the speech input to form a plurality of integrated signals, one for each of the frequency band signals, means for generating a plurality of standard signals characteristic of a legitimate talker, and comparator means for comparing each of said standard signals respectively to each of the integrated signals to generate difference signals whereby the magnitudes of said difference signals are an indication of the correspondence between the trial talker and the legitimate person.

Claim 7

A talker authentication system for analyzing speech of a trial talker in order to determine whether the trial talker is legitimate or an imposter comprising input means adapted to receive a speech sample of a predetermined plurality of words and generate an electrical speech signal in response thereto, a plurality of filter networks for separating said electrical speech signal into a plurality of frequency band signals, integration means for integrating each of said frequency band signals over the entire duration of the speech input to form a plurality of integrated signals, one for each of the frequency band signals, means for generating a plurality of standard signals characteristic of a legitimate talker, and comparator means for comparing each of said standard signals respectively to each of the integrated signals to generate difference signals whereby the magnitudes of said difference signals are an indication of the correspondence between the trial talker and the legitimate person.

Claim 8

A talker authentication system as in claim 5 including normalization means for uniformly adjusting the magnitudes of said plurality of integrated signals so that their sum is a predetermined value.

Claim 9

A talker authentication system as in claim 5 including adder means for summing said plurality of difference signals to form an authenticity signal, the magnitude of said authenticity signal serving to generally indicate whether the trial talker is legitimate or an imposter.

Claim 10

A talker authentication system as in claim 5 wherein said means for generating a plurality of standard signals characteristic of a legitimate talker comprises a plurality of adjustable voltage sources having voltage outputs for synthesizing said plurality of standard signals.