Ising H, Babisch W, Dziombowski D, von Arentsschild O, Fischer R
Audiology. 1986;25(1):1-9. doi: 10.3109/00206098609078364.
New circumaural earphones were tested in the frequency range from 100 Hz to 20 kHz and compared to commonly used supra-aural earphones. The circumaural earphone HD 230 (Sennheiser) generates test stimuli at up to 20 kHz with almost constant sound pressure levels when its pos ed on an artificial ear. The reproducibility of hearing threshold mea ed with a new microprocessor-controlled Békésy audiometer using the ne was nearly as good as under free-field conditions. The practicabil diagnostic value of high-frequency audiometry have been demonstrated er field conditions. For this application, the good sound attenuation these earphones (30 dB above 1 kHz) are important. High-frequency he ds of healthy pupils and of pupils with a history of otitis media are kHz, the hearing threshold level difference between both groups reached 20 dB.
新型耳周式耳机在100赫兹至20千赫的频率范围内进行了测试，并与常用的耳挂式耳机进行了比较。耳周式耳机HD 230（森海塞尔）放置在人工耳上时，能在高达20千赫的频率下产生几乎恒定声压级的测试刺激。使用新型微处理器控制的贝凯西听力计测量听力阈值的可重复性几乎与自由场条件下一样好。高频听力测定在自由场条件下的实际诊断价值已得到证实。对于此应用，这些耳机良好的声音衰减（1千赫以上30分贝）很重要。健康学生和有中耳炎病史学生的高频听力在2千赫时，两组之间的听力阈值水平差异达到20分贝。
