Byrne D
J Acoust Soc Am. 1986 Aug;80(2):494-504. doi: 10.1121/1.394045.
Frequency response characteristics were selected for 14 hearing-impaired ears, according to six procedures. Three procedures were based on MCL measurements with speech bands of three bandwidths (1/3 octave, 1 octave, and 1 2/3 octaves). The other procedures were based on hearing thresholds, pure-tone MCLs, and pure-tone LDLs. The procedures were evaluated by speech discrimination testing, using nonsense syllables in noise, and by paired comparison judgments of the intelligibility and pleasantness of running speech. Speech discrimination testing showed significant differences between pairs of responses for only seven test ears. Nasals and glides were most affected by frequency response variations. Both intelligibility and pleasantness judgments showed significant differences for all test ears. Intelligibility in noise was less affected by frequency response differences than was intelligibility in quiet or pleasantness in quiet or in noise. For some ears, the ranking of responses depended on whether intelligibility or pleasantness was being judged and on whether the speech was in quiet or in noise. Overall, the three speech band MCL procedures were far superior to the others. Thus the studies strongly support the frequency response selection rationale of amplifying all frequency bands of speech to MCL. They also highlight some of the complications involved in achieving this aim.
根据六种程序，对14只听力受损耳朵的频率响应特性进行了选择。三种程序基于对三种带宽（1/3倍频程、1倍频程和1又2/3倍频程）语音频段的中值听阈级（MCL）测量。其他程序基于听力阈值、纯音MCL和纯音最大舒适响度级（LDL）。通过在噪声中使用无意义音节的言语辨别测试，以及对连续言语的可懂度和愉悦度的配对比较判断，对这些程序进行了评估。言语辨别测试显示，仅七只受试耳朵的各对响应之间存在显著差异。鼻音和滑音受频率响应变化的影响最大。可懂度和愉悦度判断在所有受试耳朵中均显示出显著差异。噪声中的可懂度受频率响应差异的影响小于安静环境中的可懂度或安静或噪声环境中的愉悦度。对于某些耳朵，响应的排名取决于判断的是可懂度还是愉悦度，以及言语是在安静环境还是噪声环境中。总体而言，三种语音频段MCL程序远优于其他程序。因此，这些研究有力地支持了将语音的所有频段放大至MCL的频率响应选择原理。它们还突出了实现这一目标所涉及的一些复杂性。
