Abstract: Method and apparatus for measuring a Head-Related Transfer Function (HRTF) may include determining position and orientation of an object relative to an audio signal generating device having a first known position and orientation, based on tracking information indicating position and orientation of the object. Movement data indicating direction of movement to position the object at a target position and orientation in relation to a predetermined position and orientation of the audio signal generating device may be generated, according to the relative position and orientation of the object. When the object is determined to be at the target position and orientation, the HRTF may be determined based on detection at the object of an audio signal from the audio signal generating device at the first known position and orientation while the object is at the target position and orientation.

Abstract: Method and apparatus for measuring a Head-Related Transfer Function (HRTF) may include determining position and orientation of an object relative to an audio signal generating device having a first known position and orientation, based on tracking information indicating position and orientation of the object. Movement data indicating direction of movement to position the object at a target position and orientation in relation to a predetermined position and orientation of the audio signal generating device may be generated, according to the relative position and orientation of the object. When the object is determined to be at the target position and orientation, the HRTF may be determined based on detection at the object of an audio signal from the audio signal generating device at the first known position and orientation while the object is at the target position and orientation.

Abstract: A system and method for providing improved virtual sound images. One or more spatial cues of an audio signal may be modulated within a described range to increase the clarity and perceived localization of a virtual sound image. Interaural time delay, interaural intensity difference and/or spectra may be varied at below the “just noticeable level” to cause the virtual source location to move slightly relative to the listener's head. Such variation assists the listener's auditory system in filtering out ambiguous spatial cue information from the audio signal. The resulting virtual sound image has a larger sweet spot and is less sensitive to head movement.