Three-dimensional virtual audio display employing reduced...

H - Electricity – 04 – S

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H04S 5/00 (2006.01)

Patent

CA 2189126

Compressed head-related transfer function (HRTF)(130) parameters are prederived or derived in real time for use in filtering an audio signal for a virtual audio display. From a frequency domain viewpoint, frequency components of known transfer functions are smoothed (125) over bandwidths which are a function of the width of the ear's critical bands. In the first implementation, an HRTF is smoothed (125) by convolving the HRTF (120) with a frequency dependent weighting function in the frequency domain. In the second way, the HRTF's frequency axis is warped or mapped into a non-linear frequency domain.

Des paramètres de fonction de transfert comprimée asservie aux mouvements de la tête (FTAMT) (130) sont prédérivés ou dérivés en temps réel pour servir à filtrer un signal audio destiné à un affichage audio virtuel. Du point de vue du domaine fréquentiel, les composantes fréquentielles de fonctions de transfert connues sont lissées (125) sur des largeurs de bande qui sont une fonction de la largeur des bandes critiques de l'ouïe. Dans la première variante, une FTAMT est lissée (125) par convolution de la FTAMT (120) avec une fonction de pondération dépendant de la fréquence dans le domaine fréquentiel. Dans la deuxième variante, l'axe fréquentiel de la FTAMT est gondolé ou mappé sous forme de domaine fréquentiel non linéaire.

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