Patent ID: 7197151

Claim:
A method of processing a single channel audio signal to provide an audio signal having left and right channels corresponding to a virtual sound source at a given direction in space relative to a preferred position of a listener in use, the space including a forward hemisphere and a rearward hemisphere relative to said preferred position, the information in the channels including cues for perception of the direction of said single channel audio signal from said preferred position, the method including the steps of: i) providing a two channel signal having the single channel audio signal in each of the two channels; and ii) binaural processing the two channel signal-using one of a plurality of bead response transfer functions (HRTF) to provide a right signal in one channel for the right ear of a listener and a left signal in the other channel for the left ear of the listener, wherein the binaural processing of the two channel signal is augmented using high frequency (HF)-cut filtering for virtual source positions in the rearward hemisphere, the amount of the HF-cut filtering being settable according to the given direction of the virtual sound source relative to said preferred position and wherein the amount of HF cut filtering decreases as the given direction approaches the forward hemisphere.