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. 2017 Apr 10;12(4):e0174623. doi: 10.1371/journal.pone.0174623

Fig 1. Oscillogram with Hilbert amplitude envelope for the German word Geschichte ‘history’ (top panel) and corresponding mel scaled spectogram (lower panel).

Fig 1

Vertical lines represent the boundaries calculated from the minima in the Hilbert amplitude envelope. For this example, 21 FBS features are extracted for each of the three chunks of speech, resulting in a total of 63 FBS features for this word.