Withnell R H, Kirk D L, Yates G K
Department of Physiology, University of Western Australia, Nedlands, Australia.
J Acoust Soc Am. 1998 Jul;104(1):350-5. doi: 10.1121/1.423292.
Otoacoustic emissions have historically been measured with an acoustical probe assembly hermetically sealed in the ear canal, imposing in most cases a limited stimulus bandwidth. A physically open recording system should afford the possibility of a greater stimulus bandwidth but the change in acoustical load may affect the magnitude of otoacoustic emissions obtained. Here it is reported that the authors have measured in the guinea pig transient-evoked otoacoustic emissions extending in frequency to 20 kHz and cubic distortion tone otoacoustic emissions for f2 = 4737 and 8096 Hz with a physically open sound system. To address the effect of acoustical load provided by a physically open versus hermetically sealed system, the authors compared the amplitude of electrically evoked otoacoustic emissions recorded from a guinea pig in each case. The change in acoustical load in the ear canal introduced by the change in recording setup did not appear to make a substantial difference to the magnitude of otoacoustic emissions measured. A physically open recording system provides a good alternative to traditional acoustical probe assemblies sealed in the ear canal for the laboratory measurement of acoustically evoked otoacoustic emissions, with the advantage of permitting a greater stimulus bandwidth.
历史上，耳声发射是通过密封在耳道中的声学探头组件进行测量的，在大多数情况下，其施加的刺激带宽有限。一个物理上开放的记录系统应该能够提供更大的刺激带宽，但声学负载的变化可能会影响所获得的耳声发射的幅度。在此报告，作者使用物理上开放的声音系统在豚鼠中测量了频率扩展至20 kHz的瞬态诱发耳声发射以及f2 = 4737和8096 Hz的三次畸变音耳声发射。为了研究物理上开放与密封系统所提供的声学负载的影响，作者比较了每种情况下从豚鼠记录的电诱发耳声发射的幅度。记录设置的变化所引入的耳道声学负载的变化似乎对所测量的耳声发射幅度没有实质性影响。对于实验室测量声诱发耳声发射而言，物理上开放的记录系统是密封在耳道中的传统声学探头组件的一个很好的替代方案，其优点是允许更大的刺激带宽。
