Kuks E N, Kireeva G A, Poliakova S K
Vestn Otorinolaringol. 1990 Mar-Apr(2):22-6.
The efficacy of sound reinforcement at two bandwidths (high frequency at 250-5000 Hz and low frequency at higher than 1000 Hz frequencies with a steepness of 14 dB in the octave) in the hearing aids of children with hypoacusis was investigated. Altogether 67 children at the age of 11 to 14 years with an average hearing impairment of 35 to 97 dB were examined. In the low frequency range, 3% of the children showed a better, 33% a lower and 64% an unchanged discriminatory capacity of speech when compared to the high frequency range. The lack of the filtration effect on the discriminatory capacity was seen in children with a moderate hearing loss at high frequencies (in 50% children) due to adequate hearing perception at the above bandwidths or in children in whom hearing thresholds at 2000 and 4000 Hz were so high that failed to provide proper speech perception at both bandwidths. Therefore when hearing aids are regularly used, the high frequency range of the spectrum is sufficiently informative for the overwhelming majority of children with hearing loss, i. e. for 83%. These results give evidence that a high frequency range is adequate for children with hearing loss if they begin to use hearing aids from an early stage.
研究了两种带宽（250 - 5000Hz的高频和高于1000Hz频率且倍频程陡度为14dB的低频）的扩音效果对听力减退儿童助听器的影响。共检查了67名11至14岁、平均听力损失35至97dB的儿童。在低频范围内，与高频范围相比，3%的儿童语音辨别能力有所提高，33%的儿童语音辨别能力下降，64%的儿童语音辨别能力不变。对于高频中度听力损失的儿童（50%的儿童），由于在上述带宽下有足够的听力感知，或者对于2000Hz和4000Hz听力阈值过高以至于在两个带宽下都无法提供适当语音感知的儿童，在语音辨别能力上未观察到过滤效应。因此，当定期使用助听器时，频谱的高频范围对于绝大多数听力损失儿童（即83%）来说信息足够丰富。这些结果表明，如果听力损失儿童从早期就开始使用助听器，高频范围就足够了。
