This paper covers the construction and validation of an affordable and accurate two degree-of-freedom rotational mount for making HRTF (head-related transfer function) and BRIR (binaural room impulse response) measurements using a dummy head microphone. We review the design requirements for a rotational mount in the context of measurements for binaural rendering, with reference to perceptual factors. In order to achieve a low-cost solution, we evaluate the suitability of a motorized telescope mount. Issues considered during design of the system are discussed. The use of affordable electronics to convert the mount into a general-purpose computer-controlled rotational platform is presented, as well as objective measurements to validate performance. Finally the limitations of this system are discussed and further use cases proposed.

Authors: Shotton, Matthew; Pike, Chris; Melchior, Frank
Affiliations: BBC R&D, London, UK; BBC Research and Development, Salford, Greater Manchester, UK; University of York, Heslington, York, UK; BBC Research and Development, Salford, UK(See document for exact affiliation information.)
AES Convention: 136 (April 2014) eBrief:153
Publication Date: April 25, 2014

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