THE NATIONAL-ACOUSTIC-LABORATORIES (NAL) NEW PROCEDURE FOR SELECTING THE GAIN AND FREQUENCY-RESPONSE OF A HEARING-AID
THE NATIONAL-ACOUSTIC-LABORATORIES (NAL) NEW PROCEDURE FOR SELECTING THE GAIN AND FREQUENCY-RESPONSE OF A HEARING-AID
复制标题
DOI：
10.1097/00003446-198608000-00007
复制
发表时间：
1986-08-01
期刊：
影响因子：
3.7
通讯作者：
DILLON, H
中科院分区：
文献类型：
--
作者：
BYRNE, D;DILLON, H
提出了一种从纯音阈值选择助听器增益和频率响应的新程序。这是根据研究得出的，该研究表明以前的程序并不能满足将语音的所有频段放大到相等响度的目标，但这样做的频率响应要有效得多。对 30 只感音神经性听力障碍耳朵（27 名受试者）的测量结果以及其他研究的数据进行了分析，以确定根据听力图预测每个人的最佳频率响应的最佳公式。分析表明，平坦的听力图需要大约 8 dB/倍频程的上升频率响应特性直至 1.25 kHz，此后需要大约 2 dB/倍频程的下降特性。听力图斜率的变化需要响应斜率的大约三分之一的变化。计算出三频平均 (3FA) 增益，使其等于先前程序的 3FA 增益。通过配对比较判断言语的清晰度和愉悦度，对采用新程序的 44 名受试者（67 只辅助耳）进行了评估。规定的频率响应很少劣于，并且通常优于具有更多或更少低频和/或高频放大的几种变体中的任何一种。平均而言，使用的增益大约等于规定的增益。结论是，新公式应该规定接近最佳的频率响应，几乎没有例外。
A new procedure is presented for selecting the gain and frequency response of a hearing aid from pure-tone thresholds. This was developed from research which showed that a previous procedure did not meet its aim of amplifying all frequency bands of speech to equal loudness but that frequency responses which did so were considerably more effective. Measurements of 30 sensorineurally hearing-impaired ears (27 subjects), together with data from other studies, were analyzed to determine the best formula for predicting the optimal frequency response, for each individual, from the audiogram. The analysis indicated that a flat audiogram would require a rising frequency response characteristic of about 8 dB/octave up to 1.25 kHz and thereafter a falling characteristic of about 2 dB/octave. Variations in audiogram slope required about one-third as much variation in response slope. Three frequency average (3FA) gain was calculated to equal the 3FA gain of the previous procedure. Forty-four subjects (67 aided ears) fitted by the new procedure were evaluated by paired comparison judgments of the intelligibility and pleasantness of speech. The prescribed frequency response was seldom inferior to, and usually better than, any of several variations having more, or less, low and/or high-frequency amplification. On the average, used gain was approximately equal to prescribed gain. It is concluded that the new formula should prescribe a near optimal frequency response with few exceptions.