音楽堂の聞こえと磁気ループ席の音圧計測

概要

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This paper investigated usabilities of hard hearing people including older persons with hearing aids in concert halls, analyzing their feelings on music sounds, comparing with time-distribution of possible hearing music sound pressures during performances, especially, solo or chorus vocals in opera and symphony. Users said that sounds through T mode hearing aids at the magnetic-looped seats were amaller than ambient music sounds. But the stage music sounds (at the microphone of magnetic-loops) were measured louder than ambient music sounds in the last paper, Bulletin 37, 2000. This paper analyzed this deterioration of sound pressures, by measuring magnetic forces in the magnetic circuit. Results were as follows. 1) Magnetic forces are declined according to the distance from magnetic-loops installed in floorboards. 2) Although the recommended height of hearing aids is 1 m from the floor, the ears'height when sitting is 1.3 m, at which sounds declease to –4 dB, although sounds on the floor level inclease to +13 dB. 3) Further the sounds decleased to –6 dB due to the short distance between magnetic-loops and shields both installed in the 2 nd floor board.
実践女子大学の論文
2002-03-29