Apparatus and method for robust classification of audio...

G - Physics – 10 – L

Patent

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G10L 11/00 (2006.01) G06F 17/30 (2006.01)

Patent

CA 2573364

An apparatus for producing a fingerprint signal from an audio signal includes a means (14) for calculating energy values for frequency bands of segments of the audio signal which are successive in time, so as to obtain, from the audio signal, a sequence of vectors of energy values, a means (18) for scaling the energy values to obtain a sequence of scaled vectors, and a means (22) for temporal filtering of the sequence of scaled vectors to obtain a filtered sequence which represents the fingerprint, or from which the fingerprint may be derived. Thus, a fingerprint is produced which is robust against disturbances due to problems associated with coding or with transmission channels, and which is especially suited for mobile radio applications.

L'invention concerne un appareil pour créer un signal de pression digitale à partir d'un signal sonore, cet appareil comprenant les éléments suivants: un dispositif (14) qui calcule des valeurs énergétiques pour des bandes de fréquences de segments successifs dans le temps du signal sonore, pour obtenir, à partir du signal sonore, une suite de vecteurs de valeurs énergétiques; un dispositif (18) qui met à l'échelle les valeurs énergétiques pour obtenir une suite de vecteurs mis à l'échelle; un dispositif (22) qui filtre dans le temps la suite des vecteurs mis à l'échelle pour obtenir une suite filtrée représentant la pression digitale ou pouvant être déduite de la pression digitale. Il est ainsi possible de créer une pression digitale peu sensible aux parasites dus au codage ou à la transmission, cette pression digitale étant particulièrement adaptée aux applications de téléphonie mobile.

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