Characterization of the Electroglottographic Waveform: A Primary Study to Investigate Vocal Fold Functioning

Abstract

To objectify the vocal fold functioning we opted for a method of processing the electroglottographic (EGG) signal. This study with 7 normal and 12 pathological voices presents the results of measurements over the chest register as a function of voice intensity and frequency. Reproduction measurements show that at least 5 measurements per intensity/frequency pair are needed to get a reasonable estimation of the EGG parameters. The averaged results over about 20 measurements in the chest register showed differences for some parameters for subjects in the most different categories. To get more consistent results we recommend to improve the measurement protocol and adjust the parameters.

Acoustic and physiologic characteristics of inspiratory phonation

“…Thus some investigators have turned to the EGG for an indirect assessment of adductory adjustment. The derived measure, the EGG contact duty cycle, usually referred to as the contact quotient ͑or CQ͒, is defined as the percent of the entire vibratory cycle wherein vocal fold contact area is greater than some ''minimal level '' ͑Rothenberg and Mahsme, 1988;Scherer et al, 1988;Orlikoff, 1991;Houben et al, 1992͒. ͑In Fig. 1, %CQϭContact Phase/Vibratory Cycle, multiplied by 100.͒ Preliminary evidence indicates that the CQ provides a fairly good metric of vocal fold adduction ͑Titze, 1990; Scherer et al, 1995͒.…”

Fundamental Frequency Histograms Measured by Electroglottography During Speech: A Pilot Study for Standardization

“…14,17 The main interest of this pilot study was to design a standardized graphic representation of speaking Fo during connected speech with EGG.…”

“…[4][5][6][7][8][9][10][11][12][13] EGG provides a physiological measure of Fo at the level of the laryngeal source. 14,15 The EGG signal is much easier to process in comparison with the acoustic signal. 14 An advantage of EGG is that it can measure Fo during connected speech because no measurement sensors are introduced into the mouth.…”

“…14,15 The EGG signal is much easier to process in comparison with the acoustic signal. 14 An advantage of EGG is that it can measure Fo during connected speech because no measurement sensors are introduced into the mouth. Whereas sustained vowels are often the basis for objective evaluation, Fourcin pointed out the interest of assessing connected "real-life" speech.…”

Dysphonia Subsequent to Severe Traumatic Brain Injury: Comparative Perceptual, Acoustic and Electroglottographic Analyses

“…by a sharp closing phase due to the Bernoulli effect and a closed phase amounting to approximately 40-50% of total glottal cycle [17,18]. The relative durations of the various phases are widely recognized parameters of pathological voices [17,[19][20][21]. EGG provides a noninvasive measure of glottal contact area and, thus, displays the closing and closed phases of the vocal fold vibration cycles which are important to the production of speech sounds.…”