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Speech enhancement algorithms for audiological applications

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Figure 1.2: A simplified scheme of the typical structure of a digital hearing aid.
Figure 2.2: Spectrograms of clean speech (a) and different types of noise: babble noise (b), train noise (c) and white Gaussian noise (d).
Figure 2.3: Spectrogram of two speech signals, 20 log 10 (|S 1 (k, l)|) and 20 log 10 (|S 2 (k, l)|), and the spectrogram of their product in the time-frequency domain, 20 log 10 (|S 1 (k, l)S 2 (k, l)|)
Figure 2.4: Application of the 0 dB IBM in a mixture of two speech signals added with the same power
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