Estimation of the direct-to-reverberant Energy Ratio using a spherical microphone array

This paper proposes a practical approach to estimate the direct-toreverberant 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 ±3 dB accuracy.