定在波から導いた鼓膜反射係数

抄録

The eardrum reflectance is a convenient indicator compared to the eardrum impedance, especially at higher frequencies. This paper describes an improved system to measure the human eardrum reflectance by estimating the standing wave patterns. Sound pressure amplitude was measured in the occluded ear canals of 10 human subjects for applied pure tones of 4 to 6 kHz. Assuming that the ear canal is an uniform cylinder, the eardrum reflectance could be extracted by analysis of the standing wave patterns. But the reflectance derived by my measured deta is slightly smaller than that of the previous reports. It may suggest the possibility of the imperfect air-seal of the ear canal in my examination.