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Comparison of the DNN and LSTM in terms of STOI improvement (in %) with the unseen babble noise. (a) Performance of the DNN and LSTM on six seen speakers at −5 dB SNR. (b) Performance of the DNN and LSTM on six unseen speakers at −5 dB SNR. (c) Performance of the DNN and LSTM on six seen speakers at −2 dB SNR. (d) Performance of the DNN and LSTM on six unseen speakers at −2 dB SNR.
