Abstract
Bronchial asthma and Chronic Obstructive Pulmonary Disease (COPD) are respiratory illnesses that cause a change in specific acoustic impedance from vocal cords to the lungs. The purpose of our study is to measure the specific acoustic impedance at the vocal cord. A transfer matrix to express a vocal tract shape is necessary to find the specific acoustic impedance at the vocal cord. A past study has provided the vocal tract shape of a normal person. However, we need to find the vocal tract shape of each subject. In addition to partial and total derivatives (differentials) in the numerical value experiment, we can arrive at an accurate value of the specific acoustic impedance of actual part at the vocal cord by using the Moore _ Penrose inverse matrix. I made an acrylic model that simply reproduced human body. In model experiments, qualitative trends appeared, but quantitative differences could not read. I’m going to make measurements with people many times with trial and error.
