HIGH-FREQUENCY AUDIOMETRIC ASSESSMENT OF A YOUNG-ADULT POPULATION
HIGH-FREQUENCY AUDIOMETRIC ASSESSMENT OF A YOUNG-ADULT POPULATION
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DOI：
10.1121/1.394914
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发表时间：
1987-02-01
影响因子：
2.4
通讯作者：
STEVENS, KN
中科院分区：
文献类型：
--
作者：
GREEN, DM;KIDD, G;STEVENS, KN
本文对37名18-26岁的青年人在13个频率（8，9，10，…，20 kHz）使用新开发的高频听力计。所有受试者均在低听力计频率下以15 dB HL进行筛查，鼓室压测定在正常范围内，且无明显听力问题病史。听力计将声音从驱动器单元通过有损管和耳机传递到耳道，该有损管和耳机提供基本上等于管的特性阻抗的源阻抗。当在驱动器单元处施加脉冲时，位于耳机内的小麦克风用于测量耳道的响应。从这个响应，增益函数的计算有关的等效声压级的源的SPL在耳道的内侧端。对于受试者测试，该增益函数显示出在频率范围内从2到12 dB逐渐增加。增益函数的标准偏差在较低频率区域（8-14 kHz）中在受试者之间为约2.5dB，并且在较高频率下为约4dB。交叉模式和耳机与耳道的不匹配阻碍了某些受试者在最高频率下的准确校准。阈值处的平均SPL在8 kHz时为23 dB，在12 kHz时为30 dB，在18 kHz时为87 dB。尽管样本具有同质性，但样本中年轻受试者的阈值可靠地优于老年受试者。在长达1个月的时间间隔内重复测量阈值，显示在较低频率（8-14 kHz）和4.5 dB在较高频率下的标准偏差为2.5 dB。
The hearing thresholds of 37 young adults (18-26 years) were measured at 13 frequencies (8,9,10,...,20 kHz) using a newly developed high-frequency audiometer. All subjects were screened at 15 dB HL at the low audiometer frequencies, had tympanometry within normal limits, and had no history of significant hearing problems. The audiometer delivers sound from a driver unit to the ear canal through a lossy tube and earpiece providing a source impedance essential equal to the characteristic impedance of the tube. A small microphone located within the earpieces is used to measure the response of the ear canal when an impulse is applied at the driver unit. From this response, a gain function is calculated relating the equivalent sound-pressure level of the source to the SPL at the medial end of the ear canal. For the subjects tested, this gain function showed a gradual increase from 2 to 12 dB over the frequency range. The standard deviation of the gain function was about 2.5 dB across subjects in the lower frequency region (8-14 kHz) and about 4 dB at the higher frequencies. Cross modes and poor fit of the earpiece to the ear canal prevented accurate calibration for some subjects at the highest freqeuncies. The average SPL at threshold was 23 dB at 8 kHz, 30 dB at 12 kHz, and 87 dB at 18 kHz. Despite the homogeneous nature of the sample, the younger subjects in the sample had reliably better thresholds than the older subjects. Repeated measurements of threshold over an interval as long as 1 month showed a standard deviation of 2.5 dB at the lower frequencies (8-14 kHz) and 4.5 dB at the higher frequencies.