Usefullness of the Vibration Pick-Up in Detection of Pitch for Synchronization of Laryngeal Stroboscopy

Lee, Jin-Choon; Lee, Byung-Joo; Wang, Soo-Geun; Roh, Jung-Hoon; Kwon, Sun-Bok; Jo, Cheol-Woo

J Korean Soc Laryngol Phoniatr Logop > Volume 18(1); 2007 > Article

Journal of The Korean Society of Laryngology, Phoniatrics and Logopedics 2007;18(1): 26-32.

후두 스트로보스코프 검사의 신호 동기화를 위한 진동 검출기의 유용성

이진춘¹, 이병주¹, 왕수건¹, 노정훈², 권순복³, 조철우⁴

¹부산대학교 의과대학 이비인후과학교실
²부산대학교 의과대학 의공학교실
³부산대학교 인문대학 언어정보학교실
⁴창원대학교 공과대학 제어계측학과

Usefullness of the Vibration Pick-Up in Detection of Pitch for Synchronization of Laryngeal Stroboscopy

Jin-Choon Lee¹, Byung-Joo Lee¹, Soo-Geun Wang¹, Jung-Hoon Roh², Sun-Bok Kwon³, Cheol-Woo Jo⁴

¹Department of Otolaryngology, Busan University
²Department of Biomedical Engineering College of Medicine Busan University
³Department of Linguistics, College of Humanities, Busan University
⁴Department of Control and Instrumentation Engineering, College of Engineering, Changwon National University

ABSTRACT

Objective and Background: Laryngeal stroboscope is an useful equipment in evaluation of vocal cord vibration and in early detection of mucosal lesion including invasive cancer of the vocal cord. Recently Lee et al. (2006) developed portable stroboscope using voice as synchronization signal. It has been frequently impaired ability to synchronize the flashes even in normal female. Authors tried to investigate various methods including vibration pick-up, microphone, laryngeal microphone, and contact microphone for development of simple and accurate method like electroglottograph signal. The purpose of this study was to estimate wheher the vibration pick-up is available and is consistent with the signal of EGG. Subjects and
Method:
Authors compared the signals between EGG and noncontact method such as voice, contact methods including vibration pick-up, laryngeal microphone, and contact microphone in normal twenty adults (male 10 and female 10). The number of peak in one cycle was compared with the number of the peak in EGG, and the percent of phase difference in the peak was compared with EGG Also, authors tried to investigate which site of vibration pick-up was most effective for synchronization of stobo flashes. Three site including anterior neck below the cricoid cartilage, thyroid ala, and suprahyoid region were analysed.
Results:
Among various methods for synchronization of strobo flashes, vibration pick-up was most effective method in peak detection. And anterior neck below cricoid cartilage was the most available site of the vibration pick-up.
Conclusion:
Authors suggest that vibration pick-up is most available and effective method for synchronization of strobo flashes.

KEY WORDS： Stroboscopy;Vibration;