Estimation of Source-Filter Interaction Regions Based on Electroglottography.
Anil Palaparthi, Lynn Maxfield, Ingo R Titze
PMID 29277351WHAT IT FOUND
Electroglottography reliably detects vocal fold vibration changes caused by source-filter interaction, identifying 89% of regions in ascending glides for men and 84.8% for women.
This matches the accuracy of fundamental frequency tracking, offering an alternative method to pinpoint these acoustic interactions.
Key findings
01The electroglottography-based algorithm correctly identified 89% of source-filter interaction regions in male ascending glides and 84.8% in female ascending glides.
02Electroglottography performance was comparable to fundamental frequency tracking, with no significant difference in the accuracy of identifying interaction regions.
03Descending glides yielded lower identification rates (84% for males, 81.1% for females) due to reduced signal energy and laryngeal position changes.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only seven healthy subjects, so findings may not apply to individuals with voice disorders or pathological vocal fold vibration. Descending glides were less reliable due to weak signals caused by laryngeal elevation and lung pressure depletion, limiting the utility of this method for descending pitch tasks. The same tube lengths were used for both men and women, which may have skewed the results for women by not optimally spanning their first and second formant ranges. The electroglottography signal is an approximation of contact area and does not perfectly correlate with visual measures of glottal closure.
The easy way to misread this
Do not assume electroglottography is superior to fundamental frequency tracking for all voice analyses. The study found the two methods performed similarly overall, and electroglottography was less accurate for descending glides. Additionally, because the study used only healthy subjects, these detection rates do not apply to patients with voice disorders.