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Direct to Reverberant Ratio Measurements in Small and Mid-Sized Rooms

Direct to Reverberant Ratio (DRR) is measured for three non-idealised rooms of different sizes, using a variety of methods. Binaural room impulse response are compared to the DRR calculated from an omnidirectional room impulse response. Consistent differences were found in the absolute DRR values calculated from each type of impulse, and also when the source is positioned close to a room boundary. As expected DRR decreased with distance, but certain room features produced some inconsistencies. The binaural DRR is also shown to vary with source angle, particularly for nearfield sources. DRR values are calculated with a variety of Direct Sound integration window sizes. The results suggest that in smaller rooms, a smaller window size produces more consistent changes in DRR.

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