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THEORY AND APPLICATION OF FIELD PERTURBATION TO ELECTRICAL IMPEDANCE TECHNIQUE FOR MEDICINE

Journal of Electronics(China) 1991年第4期8卷 324-333页

作者：万明习程敬之 Xi'an Jiaotong University Xi'an

A new approach called field perturbation theory is presented to analyze the electricalimpedance technique for *** formula of constant voltage and constant current fieldperturbation,modified G-L formula and the formula of electrical field perturbation evoked bysound field are *** application results of the theory in electroglottography are alsointroduced.

关键词： Electrical impedance technique for medicine Electrical field perturbation electroglottography

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Comparison of Tongue and Lip Trills with Phonation of the Sustained Vowel /<i>ε</i>/ Regarding the Periodicity of the Electroglottographic Waveform and the Amplitude of the Electroglottographic Signal

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Open Journal of Acoustics 2015年第4期5卷 226-238页

作者： Gislaine Ferro Cordeiro Arlindo Neto Montagnoli Maysa Tibério Ubrig Marcia Helena Moreira Menezes Domingos Hiroshi Tsuji ENT Department School of Medicine University of Sao Paulo S&atildeo Paulo Brazil Electrical Engineering Department Federal University of Sao Carlos S&atildeo Paulo Brazil School of Medicine University of Sao Paulo S&atildeo Paulo Brazil Speech and Hearing Department Guarulho University Guarulhos Brazil

Aim: The aim is to compare the vocal fold vibration seen during lip and tongue trills with that seen during phonation of the sustained vowel /ε/, in terms of the periodicity of the EGG waveform and the amplitude of the EGG signal, in professional voice users. Study design: This was a quasi-experimental study. Methods: We used electroglottography (EGG) to compare the vocal fold vibration seen during tongue and lip trills with that seen during phonation of the sustained vowel /ε/, in terms of the EGG waveform periodicity and signal amplitude, in 10 classically trained, professional singers. The participants produced the sustained vowel /ε/ and performed tongue and lip trills at the same frequency and intensity. The periodicity of the waveform and the amplitude of the signal were visually analyzed by three blinded, experienced readers. To confirm the visual analysis results, we measured the jitter and shimmer of the signal and the frequency of variation in vocal fold vibration during the trill exercises. Results: The EGG waveform was classified as periodic for the sustained vowel phonation task and as quasi-periodic for the trill exercises, the vibration pattern repeating at approximately 24 Hz. Conclusion: The vibration of the vocal folds was modified according to the supraglottic movement in trills exercises.

关键词： Vibration electroglottography Amplitude Waveform Vocal Folds

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