电声门图采样场理论、实验和应用

THEORY, EXPERIMENT AND APPLICATION OF SAMPLING FIELD FOR ELECTROGLOTTOGRAPHY

本文建立了完整的电声门图采样场理论。分析了喉部容积导体电特性变化因素;介绍了推导出的场扰动理论公式、修正Geselowitze-Lehr公式、灵敏度分布公式、调制度预测公式和喉部组织中电场与音频声场互作用公式;建立了电声门图数学模型;提出了横向和纵向电声门图概念及其测量方法,并研究了横向电声门图与声带振动的关系;澄清了微音器效应产生机理并提出了抑制方法。理论研究结果由模型和人体实验结果所证实。基于上述理论研制成功的多功能声门图仪已被用于喉科临床和嗓音学研究。

The complete sampling field theory for electroglottography (EGG) is set up in this paper. The factors which results in conductivity change in tissue around laryngeal are analysed. And the developed field disturbance formula, modified G-L formula, sensilivity distribution formula, the formula for depth of modulation and the interaction formula between electrical and audio acou- stical fields in tissue around laryngeal are introduced. This paper also propos- es concepts of horizontal and vertical electroglottographies and their measure- ment methods. The relations between horizontal EGG and vocal fold vibration are studied. The mechanism of microphone effect is clarified. and its rejection method is put forward. All theoretical lesult sresults are verified by many physical model and human phonation experimental results. Based on the theory and ex- periments mentioned above the multifunction glottograph has been developed and used in laryngeal clinic and voice research.