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. 2011 Dec 14;6(12):e28317. doi: 10.1371/journal.pone.0028317

Figure 1. Sketch of the vocal model.

Figure 1

The figure in the middle represents the concatenation of tubes that approximate the vocal tract. The upper panel represents, from left to right, the voiced source spectrum of fundamental frequency Inline graphic, the vocal tract transfer function for a tube of about 17.5 cm and the multiplication of both, corresponding to the resulting voiced sound. In the lower panel, a colored noise sound source characterizing the turbulent flow at the exit of the constriction at the section Inline graphic of the vocal tract and the resulting fricative sound, filtered by the vocal tract.