A system and a method for detecting recorded biometric information

摘要

A method for detecting a recorded biometric information, the method comprising preparing (201) a spectrogram S n,k of the recorded speech biometric information, wherein the spectrogram S n,k is an N x K matrix, where S n,k is a log-amplitude of the spectrogram at a given time frame n and frequency bin k; the method being characterized in that it further comprises the steps of: normalizing (202) the spectrogram by its mean spectral value; subjecting (203) the spectrogram to high-pass digital filtering; extracting (204) a local maxima pair; and calculating (205) a similarity by comparing the output of the local maxima pair extraction with a previously stored data.