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Several experiments have been performed to investigate the mechanicalvibrations associated with trachea and larynx when Italian vowels are emitted.The mechanical measurements have been made by using two laser Dopplervibrometers (based on the well-known not-invasive optical measurementtechnique) coupled with the acoustic field measured by high-quality certifiedmicrophones. The recorded signals are analyzed by using well-establishedmethods in time and frequency domains. The signals of the mechanical vibrationsalong the trachea and the larynx are compared with those of the acoustic ones.Focusing the attention of the signals' onsets, we can observe an upwardpropagation of the mechanical vibrations for which it is possible to estimate adelay between the traces. We observe that the mechanical oscillations at thetrachea start before the larynx and acoustic oscillations. Moreover thesetracheal oscillations are self-oscillations in time and are associated with thepitch production, indicating a further hydrodynamic instability at trachea.This leads to new insights in the mechanism controlling the pitch in thespeech.

Experimental investigation of the trachea oscillation and its role in the pitch production