図式解析を応用した音響四端子定数の測定法

概要

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Since the absorption coefficient of sound absorbing materials are considerably dependent upon the condition of the space behind the materials, it become necessary to regard the absorbing material as an acoustical four-terminal network and obtain the four-terminal coefficients for its study. Two methods of obtaining the acoustical four-terminal coefficients are shown in this paper. In one method the elements of the S-matrix are obtained graphically from the values of the reflection coefficient under different lengths of air-spaces behind the test materials, while in the other method the elements of the A-matrix are obtained graphically from the relative sound pressures recorded in front and behind the specimen as well from phase-differences.
社団法人日本音響学会の論文