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Electroglottography (EGG) is a low-cost, noninvasive technology for measuring changes of relative vocal fold contact area during laryngeal voice production (Herbst, 2019).
In electroglottography (EGG) a high-frequency, low-amperage current is passed between two electrodes placed on each side of the thyroid cartilage. Changes in vocal fold contact area (VFCA) during vocal fold vibration result in admittance variation, and the resulting (demodulated) EGG signal is proportional to the relative VFCA.
In Praat the EGG signal is represented by the Electroglottogram.
From standard electroglottography measurements generally a multi-channel sound file results. One channel of this file contains the recorded electroglottogram, the other the recorded sound. You can extract the electroglottogram with the Extract Electroglottogram... command that you will find under the Sound: Convert - menu.
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