RMSE (in degree) for two concurrent speakers moving towards each other. The top panel shows the results for the core algorithm including spectral comb filter (Setup II); the bottom panel shows the results for the proposed algorithm (Setup V). Columns (a) and (b) show the results for RT60=0 ms and RT60=560 ms (measured RIR) and varying SNR values. Column (c) shows the results for SNR =∞ and several simulated RIRs. The very right bar in each panel shows the mean RMSE for the respective condition.