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Perceptual Evaluation of Synthetic Early Binaural Room Impulse Responses Based on a Parametric Model

Binaural synthesis is often applied in the field of spatial audio to create a virtual acoustic environment using binaural room impulse responses (BRIRs). In the same area of research, spherical microphone arrays are gaining importance and allow for a spatio-temporal analysis. We present a new approach to describe the acoustical environment by a parametric model using sound field analysis. Combining spherical head related impulse responses (HRIRs) with this description, early BRIRs are synthesized and compared to the measured counterparts in a perceptual evaluation. The listening experiment revealed adequate performance of the approach, almost independently from room and test signal. Surprisingly the synthesis of direct sound and only diffuse reverberation yielded nearly the same results as for the entire parametric model.

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