Factors affecting the benefits of high-frequency amplification
Factors affecting the benefits of high-frequency amplification
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DOI：
10.1044/1092-4388(2008/057
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发表时间：
2008-06-01
影响因子：
2.6
通讯作者：
Dubno, Judy R.
中科院分区：
文献类型：
--
作者：
Horwitz, Amy R.;Ahlstrom, Jayne B.;Dubno, Judy R.
目的：本研究的目的是确定在何种程度上高频放大帮助或阻碍语音识别的听力损失，增益频率响应，和background noise.Method的功能：语音识别进行了测量monaurally耳机下的无意义音节低通滤波在三分之一倍频程之间的步骤2.2和5.6 kHz。成年人听力正常，高频阈值范围从40到80分贝HL听语音在安静的处理与相同的“非个性化”的增益频率响应。听力受损的参与者还听取了讲话，在安静和噪音处理的增益频率响应单独规定根据国家声学实验室修订（NAL-R）formulation.Results：平均语音识别一般增加显着与额外的高频语音频带。唯一的例外是，听力受损的参与者对非个性化反应处理的语音识别并没有随着最高频段的增加而显着改善。显着更大的增加分数随着带宽的增加，观察到在噪声中的语音比quiet.Conclusions：鉴于分数的下降与额外的高频语音频带的个人参与者是相对较小的，很少，并没有增加与安静的阈值，没有证据表明听力损失的程度被发现高于它是适得其反，提供放大。
Purpose: This study was designed to determine the extent to which high-frequency amplification helped or hindered speech recognition as a function of hearing loss, gain-frequency response, and background noise.Method: Speech recognition was measured monaurally under headphones for nonsense syllables low-pass filtered in one-third-octave steps between 2.2 and 5.6 kHz. Adults with normal hearing and with high-frequency thresholds ranging from 40 to 80 dB HL listened to speech in quiet processed with an identical "nonindividualized" gain-frequency response. Hearing-impaired participants also listened to speech in quiet and noise processed with gain-frequency responses individually prescribed according to the National Acoustic Laboratories-Revised (NAL-R) formula.Results: Mean speech recognition generally increased significantly with additional high-frequency speech bands. The one exception was that hearing-impaired participants' recognition of speech processed by the nonindividualized response did not improve significantly with the addition of the highest frequency band. Significantly larger increases in scores with increasing bandwidth were observed for speech in noise than quiet.Conclusions: Given that decreases in scores with additional high-frequency speech bands for individual participants were relatively small and few and did not increase with quiet thresholds, no evidence of a degree of hearing loss was found above which it was counterproductive to provide amplification.