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Implementation and Evaluation of Electroglottograph System  

김기련 (동아대학교 의과대학 의공학교실, 부산대학교 의과대학 의공학교실)
김광년 (동아대학교 의과대학 의공학교실)
왕수건 (부산대학교 의과대학 이비인후과학교실)
허승덕 (동아대학교 의과대학 의공학교실)
이승훈 (동아대학교 의과대학 의공학교실)
전계록 (부산대학교 의과대학 의공학교실)
최병철 (춘해대학 의료공학과)
정동근 (동아대학교 의과대학 의공학교실)
Publication Information
Journal of Biomedical Engineering Research / v.25, no.5, 2004 , pp. 343-349 More about this Journal
Abstract
Electroglottograph(EGG) is a signal recorded from the vocal cord vibration by measuring electrical impedance across the vocal folds through the neck skin. The purpose of this study was to develop EGG system and to evaluate possibility for the application on speech analysis and laryngeal disease diagnosis. EGG system was composed of two pairs of ring electrodes, tuned amplifier, phase sensitive detector, low pass filter, and auto-gain controller. It was designed to extract electric impedance after detecting by amplitude modulation method with 2.7MHz carrier signal. Extracted signals were transmitted through line-in of PC sound card, sampled and quantized. Closed Quotient(CQ), Speed Quotient(SQ), Speed Index(SI), fundamental frequency of vocal cord vibration(F0), pitch variability of vocal fold vibration (Jitter), and peak-to-peak amplitude variability of vocal fold vibration(Shimmer) were analyzed as EGG parameters. Experimental results were as follows: the faster vocal fold vibration, the higher values in CQ parameter and the lower values in SQ and SI parameters. EGG and speech signals had the same fundamental frequency. CQ, SQ, and SI were significantly different between normal subjects and patients with laryngeal cancer. These results suggest that it is possible to implement portable EGG system to monitor the function of vocal cord and to test functional changes of the glottis.
Keywords
Electroglottograph; Laryngeal disease; Fundamental frequency;
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