Hallmo P, Sundby A, Mair I W
Department of Otorhinolaryngology, Ullevăl Hospital, Oslo, Norway.
Scand Audiol. 1991;20(2):139-43. doi: 10.3109/01050399109070803.
Various response characteristics of the Präcitronic KH70 bone vibrator have been investigated in the frequency range 0.25 through 16 kHz. Masked threshold reproducibility is satisfactory throughout the frequency range. An occlusion effect is present only at frequencies at and below 1 kHz. Stimulus perception lateralizes to the occluded ear through 1 kHz and less consistently at successively higher frequencies. The KH70 does not satisfy the IEC 645 (1979) criterion for acoustic radiation for frequencies below 6 kHz, especially at the intermediate frequencies of 0.5, 1 and 2 kHz. With the restrictions inherent in the occlusion effect, this does not, however, interfere with threshold determination. The vibrator would thus seem suitable for clinical use through 16 kHz.
已在0.25至16千赫的频率范围内研究了Präcitronic KH70骨振动器的各种响应特性。在整个频率范围内，掩蔽阈值再现性令人满意。仅在1千赫及以下的频率存在堵耳效应。刺激感知在1千赫及以下频率偏向被堵塞的耳朵，在更高频率时一致性逐渐降低。对于6千赫以下的频率，尤其是在0.5、1和2千赫的中频，KH70不符合IEC 645（1979）的声辐射标准。然而，由于堵耳效应固有的限制，这并不妨碍阈值测定。因此，该振动器似乎适用于16千赫以下的临床应用。
