Patent ID: 6480825
Filing Date: 2002-11-12
Classification: G07C,G10L

Abstract:
A method for verifying that a detected speech sample is live and not a recording comprising:detecting a first speech sample from a known person; extracting temporal characteristics from the first speech sample to create a first characteristics set; detecting a second speech sample; extracting the temporal characteristics from the second speech sample to create a second characteristics set; comparing the first and second characteristics sets and denying verification if the first and second characteristics sets do not match within a preset tolerance, wherein the denial of verification indicates that the second speech sample is a recording creating a voice print from the first sample; comparing the second sample to the voice print and determining that the known person generated the second sample if the second sample matches the voice print within a preset tolerance detecting a third speech sample; extracting the temporal characteristics from the third speech sample to create a third characteristics set; comparing the third characteristics set to each of the first and second characteristics sets; and denying verification if the third characteristics set do not match either of the first or second characteristics sets within a preset tolerance, wherein the denial of verification indicates that the third speech sample is a recording producing a first comparison score during the step of comparing the second sample to the voice print; producing a second comparison score during the step of comparing the third sample to the voice print; comparing the first and second comparison scores and denying verification if the first and second comparison scores match within a preset tolerance, wherein the denial of verification indicates that the third voice sample is a recording.