These days many games are played using portable devices and headphones, on which spatial binaural audio can be conveniently presented. One way of converting from conventional loudspeaker formats to binaural format is through the use of Head Related Transfer Functions (HRTFs), but head-tracking is also necessary to obtain a satisfactory externalisation of the simulated sound field. Typically a large HRTF dataset is required in order to provide enough measurements for a continuous auditory space to be achieved through simple linear interpolation. This paper describes the use of alternative representations of an HRTF dataset using orthogonal basis functions and further parametric techniques often associated with speech processing. This allows both convenient and unambiguous interpolation and a significant reduction in the number of stored measurements required to generate a continuous auditory space. It is possible that these techniques may also be useful in developing efficient schemes of custom HRTF capture.
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