Poulsen T
Acoustics Laboratory, Technical University of Denmark, Lyngby.
Scand Audiol. 1988;17(3):147-9. doi: 10.3109/01050398809042185.
The sound attenuation of TDH-39 earphones with MX-41/AR cushions has been measured in two different configurations: 1) earphones attached to the usual audiometric headband, and 2) earphones mounted in a noise-excluding headset, ME-70 from Madsen Electronics. The measurement method was in accordance with ISO 4869-1981 for hearing protectors, using 1/3-octave noise bands in a diffuse field. For almost all frequencies, the attenuation results (config. 1) are lower than the guidance values given in the audiometric test method standard, ISO/DIS 8253. The noise-excluding headset (config. 2) provides a 7-10 dB better attenuation.
已在两种不同配置下测量了配备MX - 41/AR耳垫的TDH - 39耳机的声音衰减情况：1）耳机连接到普通听力测试头带；2）耳机安装在Madsen Electronics公司的ME - 70隔音头戴式耳机中。测量方法符合用于听力保护器的ISO 4869 - 1981标准，在扩散场中使用1/3倍频程噪声频段。对于几乎所有频率，（配置1的）衰减结果均低于听力测试方法标准ISO/DIS 8253中给出的指导值。隔音头戴式耳机（配置2）的衰减效果要好7 - 10分贝。
