THREE-DIMENSIONAL VIRTUAL AUDIO DISPLAY EMPLOYING REDUCED COMPLEXITY IMAGING FILTERS

摘要

Compressed head-related transfer function (HRTF)(130) parameters are prederi ved or derived in real time for use in filtering an audi o signal for a virtual audio display. From a frequency domain viewpoint, freq uency components of known transfer functions are smoothe d (125) over bandwidths which are a function of the width of the ear's critica l bands. In the first implementation, an HRTF is smooth ed (125) by convolving the HRTF (120) with a frequency dependent weighting function i n the frequency domain. In the second way, the HRTF's frequency axis is warped or mapped into a non-linear frequency domain.