Vagmi Advanced Voice Module

This module is specifically meant for Speech Language Pathologists (SLPs), ENR specialists, Phonosurgeons as the interpretation of results obtained using the menu options of this module require an expertise.

There are two menu options under this module:

Acoustic Glottogram

The phonation signal of a steady ‘aa’ or ‘A’ is recorded and the air flow through the glottis is deduced. The ‘pattern’ or the ‘shape’ of the air flow through the glottis depends on the manner of vibration of the vocal folds. Thus an experienced professional can interpret the voice quality as breathy or modal or pressed or falsetto by looking at this pattern. Also, the opening, closing and closed durations relative to pitch period can be deduced. Using the pattern displayed as a feedback, the client may try to improve the voice quality.

Glottal Leakage

The duration for which a client can say a steady vowel with a single breath is referred to as the maximum phonation duration (MPD). Although the respiratory support of the client is good, the air stored in the lungs may be depleted very fast due to the client’s breathy voice.

This module provides a graphic display corresponding to the voice quality of the client. One has to achieve as large a phonation duration as possible while maintaining a good voice quality.

Voice Focus

The pronunciation of sounds must be clearly enunciated. If the movement of the articulators- tongue, jaw and lips is highly restricted then the voice quality is poor. Examples of poor voice quality are ‘clenched teeth’, ‘palatalized’ etc.

The client is asked to say steady vowels or vowels in a context. Then, the module measures and gives a graphic display of the spread in ‘vowel space’. When the vowel space of the client is compared with the vowel space of a normal reference, it gives an idea about how clustered or blurred one’s voice is for correction.