EGG
Take your understanding of voice science to a higher level with our electroglottograph (EGG). It’s small, simple to set up, and significantly cheaper than other manufacturers. This device can be used in a number of fields, but when paired with VoceVistaVideo Pro, it enables you to examine the opening and closing of the glottis and its affect on the sound produced. This is very useful for singers, singing teachers, and speech language pathologists who want to better understand the voice.
The current price for the EGG is $850 US (plus applicable taxes), which includes all cables to connect the unit to your computer (Windows or Apple). Please email Niels Miller if you are interested in purchasing an EGG, or have additional questions.
We offer a student discount of 25% for those currently enrolled in a university and who own, or are purchasing, VoceVista Video Pro.
The following short video shows how the EGG signal appears in the lower right corner of VoceVista Video Pro.
Setting up the EGG
The first thing you need to do when the package arrives is charge the EGG overnight. While the unit is charging, you can read through this document which contains all of the procedures for configuring your EGG. Additional documents for setting up the EGG can be found here.
Positioning the Electrodes
Proper positioning of the electrodes is extremely important to obtaining a good signal from the EGG. The process is slightly different for everyone due to physiological differences in body types. You can read more in this document.
The electroglottograph sends a minute high-frequency electric current between the two electrodes. The variations in resistance as the glottis opens and closes (resistance is less when there is no gap between the vocal folds) are the basis for the EGG signal, from which the program determines the closed quotient.
There is considerable variation among subjects with respect to the strength and quality of EGG signals. Correct placement of the electrodes and good contact between their surface and the neck is essential for the best signals. The photos in Getting Started show the proper position of the electrodes on opposite sides of the larynx, for one subject. It is suggested that the user experiment by trying various positions while phonating and observing the signals in the monitor. Note that the distance between the electrodes is adjustable by moving their position on the on the elastic neck strap.