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High-Frequency Interpolation for Motion-Tracked Binaural Sound

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Motion-tracked binaural (MTB) recording captures and exploits localization cues resulting from head rotation. The pressure field around the recording head is sampled with several microphones, and a head tracker on the listener’s head is used to interpolate between the microphone signals. Although time-domain interpolation works at low frequencies, phase interference causes problems at high frequencies. We previously reported on a simple procedure whereby low-frequency components were continuously interpolated but high-frequency components were obtained from the microphone nearest to the listener’s ear. Although effective, this technique may result in audible switching artifacts. In this paper we present and evaluate methods for continuous high-frequency interpolation of the spectral magnitudes of adjacent microphones that essentially eliminate spectral discontinuities arising from head rotation.

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