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1. This time-domain signal shows clear segmentation between different numbers.
2．This shows a normalized spectrogram of the number “1”. Formants are visible but not clear.
3. Enhanced by a non-linear filter to emphasize the difference between peak values and background. Formants are much more distinct.
4. This shows the filtered spectrum in the Mel-scale, a logarithmic scale that models human hearing. Corner-frequency of 700 Hz used.
5. Weighted scatter plot with contours of the maximum likelihood GMM overlaid, showing the formants.
6. The GMM generated by the Mel-scale signal differs greatly from the linear-frequency version.
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