Room statistics and direct-to-reverberant ratio estimation from dual-channel signals

A method for the estimation of the direct-to-reverberant-ratio (DRR) from dual-channel microphone recordings without having knowledge of the source signal is proposed. The method is based on previous findings for the statistics of the room transfer function spectral standard deviation and its relationship to the DRR. A novel relationship for the standard deviation of the difference of the magnitude spectra of dualchannel microphone recordings as a function of the DRR is derived. The proposed DRR estimation method is tested and evaluated on reverberant signals recorded in various rooms and at various source/receiver distances.