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The Importance of Reflections in a Binaural Room Impulse Response

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A room impulse response constitutes a unique signature of an acoustical space, however much of the detail is masked by the direct sound and highest level reflections. Reflections which are substantially masked may be simplified in some way without audible effects, thus reducing computational requirements. Audibility thresholds of individual reflections were measured, then used as a template to remove low level reflections from the BRIR, and replace them with a simplified signal. This was done using a simple binaural loudness model. Listening tests showed that for voice signals, altered BRIR's were virtually indistinguishable from the original versions, even when 93% of the BRIR between 15 ms and 200 ms was replaced.

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