Fig. 4

Spectrogram comparison. a clean speech, b noisy speech (SNR = − 5 dB), c reverberant speech (T₆₀ = 3.57 s), d noisy and reverberant speech (SNR = − 5 dB, T₆₀ = 3.57 s), and e reinforcement and dereverberation speech (SNR = − 5 dB, T₆₀ = 3.57 s)