Comparing audio using characterizations based on auditory...

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G10L 11/00 (2006.01) G10L 15/04 (2006.01) G10L 17/00 (2006.01) H04N 5/60 (2006.01) H04N 5/04 (2006.01)

Patent

CA 2447911

A method for determining if one audio signal is derived from another audio signal or if two audio signals are derived from the same audio signal compares reduced-information characterizations of said audio signals, wherein said characterizations are based on auditory scene analysis. The comparison removes from the characterisations or minimizes in the characterisations the effect of temporal shift or delay on the audio signals(5-1), calculates a measure of similarity(5-2), and compares the measure of similarity against a threshold. In one alternative, the effect of temporal shift or delay is removed or minimized by cross-correlating the two characterizations. In another alternative, the effect of temporal shift or delay is removed or minimized by transforming the characterizations into a domain that is independent of temporal delay effects, such as the frequency domain. In both cases, a measure of similarity is calculated by calculating a coefficient of correlation.

L'invention concerne un procédé sert à déterminer si un signal audio est dérivé d'un autre signal audio ou si les deux signaux audio sont dérivés du même signal audio. Selon ce procédé, les caractérisations d'informations réduites desdits signaux audio, lesquelles sont fondées sur une analyse d'une scène auditive, sont comparées. Pendant cette comparaison l'effet de décalage ou retard temporel sur les signaux audio (5-1) est retiré des caractérisations ou minimise dans celles-ci, une mesure de similarité (5-2) est calculée, et comparée à un seuil. Dans un mode de réalisation, l'effet de décalage ou retard temporel est retiré ou minimisé par corrélation croisée entre les deux caractérisations. Dans un autre mode de réalisation, l'effet de décalage ou de retard temporel est retiré ou minimisé par transformation des caractérisations en un domaine qui est indépendant des effets de retard temporel, tels que le domaine de fréquence. Dans les deux cas, une mesure de similarité est effectuée par calcul d'un coefficient de corrélation.

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