Method for verifying the identity of a speaker and related computer readable medium and computer
First Claim
1. A method for verifying the identity of a speaker based on the speaker'"'"'s voice, comprising the steps of:
- a) receiving, at a computer, a voice utterance;
b) verifying, using the computer, that the speaker'"'"'s voice corresponds to the speaker the identity of which is to be verified based on the received voice utterance, using biometric voice data;
c) verifying, using the computer, that the received voice utterance is not falsified, preferably after having verified the speaker'"'"'s voice in step b) and without requesting any additional voice utterance from the speaker, using the following procedures;
determining a speech modulation index or a ratio between signal intensity in two different frequency bands, or both, of the received voice utterance preferably to determine a far field recording of a voice;
evaluating the prosody of the received voice utterance; and
detecting discontinuities in the background noise; and
d) accepting the speaker'"'"' s identity to be verified when both verification steps give a positive result and not accepting the speaker'"'"' s identity to be verified if any verification steps give a negative result.
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Abstract
The present invention refers to a method for verifying the identity of a speaker based on the speakers voice comprising the steps of: a) receiving a voice utterance; b) using biometric voice data to verify (10) that the speakers voice corresponds to the speaker the identity of which is to be verified based on the received voice utterance; and c) verifying (12, 13) that the received voice utterance is not falsified, preferably after having verified the speakers voice; d) accepting (16) the speakers identity to be verified in case that both verification steps give a positive result and not accepting (15) the speakers identity to be verified if any of the verification steps give a negative result. The invention further refers to a corresponding computer readable medium and a computer.
32 Citations
11 Claims
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1. A method for verifying the identity of a speaker based on the speaker'"'"'s voice, comprising the steps of:
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a) receiving, at a computer, a voice utterance; b) verifying, using the computer, that the speaker'"'"'s voice corresponds to the speaker the identity of which is to be verified based on the received voice utterance, using biometric voice data; c) verifying, using the computer, that the received voice utterance is not falsified, preferably after having verified the speaker'"'"'s voice in step b) and without requesting any additional voice utterance from the speaker, using the following procedures; determining a speech modulation index or a ratio between signal intensity in two different frequency bands, or both, of the received voice utterance preferably to determine a far field recording of a voice; evaluating the prosody of the received voice utterance; and detecting discontinuities in the background noise; and d) accepting the speaker'"'"' s identity to be verified when both verification steps give a positive result and not accepting the speaker'"'"' s identity to be verified if any verification steps give a negative result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification