Effect of a single-channel wide dynamic range compression circuit on perception of stop consonant place of articulation.
Effect of a single-channel wide dynamic range compression circuit on perception of stop consonant place of articulation.
复制标题
单通道宽动态范围压缩电路对发音停止辅音位置感知的影响。
DOI：
10.1044/jslhr.4305.1174
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Rice,T
中科院分区：
文献类型：
--
作者：
Hedrick,MS;Rice,T
以往的研究表明，改变辅音在特定频率区域的振幅相对于相邻元音在相同频率区域的振幅会影响听者对辅音发音位置的感知。具有单通道、快速作用的宽动态范围压缩（WDRC）的助听器通过增加辅音能量来改变整体辅音-元音（CV）强度比。也许WDRC在提高语音识别性能方面取得有限成功的一个原因是辅音和元音之间的自然幅度平衡在关键频率区域被改变，从而干扰了上述用于确定发音位置的幅度线索。本研究探讨了当辅音和元音的相对振幅被操纵时，WDRC电路对听者发音位置感知的影响。刺激是一个连续的合成CV音节剥离所有的地方线索，除了相对辅音振幅。助听器处理前后CV的声学分析显示高频能量的可预测增加，特别是对于辅音的爆发。肺泡爆发有更多的高频能量比唇爆发。25名听力正常和5名感音神经性听力损失的受试者在无辅助的情况下和通过具有单通道WDRC的助听器记录音节后标记CV音节的辅音。有显着更多的听众谁不能产生类别边界时，标记的辅助刺激。在那些对辅助和非辅助刺激都产生类别边界的听众中，对辅助条件的肺泡反应明显更多。这些结果可以通过对辅助刺激的声学分析来解释。
Previous studies have shown that altering the amplitude of a consonant in a specific frequency region relative to an adjacent vowel's amplitude in the same frequency region will affect listeners' perception of the consonant place of articulation. Hearing aids with single-channel, fast-acting wide dynamic range compression (WDRC) alter the overall consonant-vowel (CV) intensity ratio by increasing consonant energy. Perhaps one reason WDRC has had limited success in improving speech recognition performance is that the natural amplitude balances between consonant and vowel are altered in crucial frequency regions, thus disturbing the aforementioned amplitude cue for determining place of articulation. The current study investigated the effect of a WDRC circuit on listeners' perception of place of articulation when the relative amplitude of consonant and vowel was manipulated. The stimuli were a continuum of synthetic CV syllables stripped of all place cues except relative consonant amplitudes. Acoustic analysis of the CVs before and after hearing aid processing showed a predictable increase in high-frequency energy, particularly for the burst of the consonant. Alveolar bursts had more high-frequency energy than labial bursts. Twenty-five listeners with normal hearing and 5 listeners with sensorineural hearing loss labeled the consonant sound of the CV syllables in unaided form and after the syllables were recorded through a hearing aid with single-channel WDRC. There were significantly more listeners who were unable to produce a category boundary when labeling the aided stimuli. Of those listeners who did yield a category boundary for both aided and unaided stimuli, there were significantly more alveolar responses for the aided condition. These results can be explained by the acoustic analyses of the aided stimuli.