A system and a method for detecting recorded biometric information

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 b...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	GALKA, JAKUB, GRZYWACZ, MARCIN, SAMBORSKI, RAFAL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACOUSTICS CALCULATING COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY MUSICAL INSTRUMENTS PHYSICS SPEECH ANALYSIS OR SYNTHESIS SPEECH OR AUDIO CODING OR DECODING SPEECH OR VOICE PROCESSING SPEECH RECOGNITION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	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.