Figure 4.

CNR as a function of mean squared error validation loss for DNN beamformers trained with (a) dataset #1, (b) dataset #2, and (c) dataset #3. The validation loss is the average validation loss for all DNNs in a DNN beamformer. The CNR values are average values across the channel SNR range studied in the anechoic cyst simulation. The black dashed line indicates CNR for DAS and the gray dashed dotted line indicates CNR for GCF. (d) Each blue line represents the channel SNR after processing by a specific a DNN beamformer. The dashed black line is the channel SNR for the best DNN beamformer selected based on CNR. The dashed-dotted gray line is the input channel SNR.