Estimation of the direct-to-reverberant Energy Ratio using a spherical microphone array
This provides a practical solution for acoustic engineers and researchers needing to assess room acoustics, though it is incremental as it builds on existing theoretical relationships.
The paper tackles the problem of estimating the direct-to-reverberant energy ratio (DRR) in acoustic environments using a spherical microphone array without prior knowledge of the source signal, achieving results with ±3 dB accuracy across frequencies from 199 to 2511 Hz.
This paper proposes a practical approach to estimate the direct-to-reverberant energy ratio (DRR) using a spherical microphone array without having knowledge of the source signal. We base our estimation on a theoretical relationship between the DRR and the coherence estimation function between coincident pressure and particle velocity. We discuss the proposed method's ability to estimate the DRR in a wide variety of room sizes, reverberation times and source receiver distances with appropriate examples. Test results show that the method can estimate the room DRR for frequencies between 199 - 2511 Hz, with $\pm$ 3 dB accuracy.