Optimizing the microphone array size for a virtual artificial head
As an alternative to traditional artificial heads, individual head-related transfer functions (HRTFs) can be synthesized with a virtual artificial head (VAH) consisting of a multi-microphone array in combination with filter-and-sum signal processing. The accuracy of the synthesis depends, amongst others, on the number of microphones in the array and on its topology (array size and microphone positions). In this study the effect of microphone array size on the synthesis accuracy was investigated. Five simulated microphone arrays of different sizes were used to synthesize individual HRTFs in the horizontal plane. Objective results in terms of spectral distortion and ILD deviation as well as subjective results with 10 participants showed that array size has a major effect and that the synthesis accuracy can be improved by carefully choosing an appropriate array size.
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