Arlinger S D
J Acoust Soc Am. 1986 Jan;79(1):189-91. doi: 10.1121/1.393648.
The sound attenuation characteristics of the audiometric earphone Telephonics TDH-39 with cushion MX-41/AR have been tested, using the hearing threshold method according to the International Standard ISO 4869-1981 ("Acoustics--Measurement of sound attenuation of hearing protectors--Subjective method"). This method specifies 1/3-oct bands of noise as test signals and a diffuse sound field. This is in contrast to the use of pure tones in a frontally incident free sound field, by means of which most earlier attenuation data have been obtained. The mean sound attenuation values obtained from a group of 20 normal-hearing subjects were up to 3-5 dB lower than those previously reported for pure tones in a free field.
采用符合国际标准ISO 4869-1981（《声学——听力保护器声衰减的测量——主观法》）的听力阈值法，对带有MX-41/AR缓冲垫的Telephonics TDH-39听力计耳机的声音衰减特性进行了测试。该方法规定使用1/3倍频程噪声带作为测试信号，并采用扩散声场。这与在正面入射的自由声场中使用纯音的方法形成对比，大多数早期的衰减数据是通过这种方法获得的。从20名听力正常的受试者组中获得的平均声音衰减值，比之前在自由场中使用纯音所报告的值低3至5分贝。
