Patent ID: 6768798
Filing Date: 2004-07-27
Classification: H04S

Abstract:
A method for determining a head related transfer function (HRTF) for an individual listener, comprising:playing a series of wide-spectrum sample sounds each including high and low audio frequencies from a plurality of virtual three-dimensional positions surrounding an individual human listener, such that said high and low audio frequencies includes sounds in the ranges of 250-450 Hz, 800-1800 Hz, and 4000-20,000 Hz for a set of front/back tests, said high and low audio frequencies include sounds in the range of 4000-20,000 Hz for a set of up/down tests, and said high and low audio frequencies includes sounds in the ranges of 250-1800 Hz and 4000-20,000 Hz for a set of right/left tests; identifying a plurality of apparent three-dimensional positions such sample sounds appear to be coming-from by said individual human listener as front, behind, above, below, right, left, a combination, or undistinguishable; determining an HRTF for said individual human listener by comparing differences in respective ones of said virtual three-dimensional positions and said apparent three-dimensional positions; and correcting thereafter at least one audio performance for said individual human listener with said HRTF to create a convincing three-dimensional sound effect.