Binaural and monaural speech discrimination under reverberation.
Binaural and monaural speech discrimination under reverberation.
复制标题
混响下的双耳和单耳语音辨别。
作者：
S. Gelfand;Irving Hochberg
这项研究调查了混响对 30 名听力正常的受试者和 30 名双侧感音神经性听力损失者的言语辨别能力的影响。初步测试后，以 0、1、2 和 3 秒的混响时间进行单耳和双耳测试。所有刺激均在耳机下进行。列表和条件被适当地随机和平衡，以便每个受试者在每个混响时间 (RT) 单耳和双耳听到测试列表。模拟由于双耳响度求和而产生的预期增益，以测试任何双耳可懂度增强可能由于双耳响度求和而产生的可能性。在所有条件下，听力正常的受试者的表现均明显优于听力受损的受试者。然而，相对而言，这两个群体非常相似。两组在每次 RT 时的双耳评分均显着高于单耳评分（尽管存在同相条件）。对于两组来说，单耳和双耳得分随着 RT 的增加而下降。 RT 组的单耳评分下降速度明显快于双耳评分（然而，正常组的双耳优势更大）。增加单耳呈现级别来模拟双耳响度增益并不会导致更高的分数。结论是，对于听力正常的人和听力受损的人来说，混响下的言语辨别能力比单耳更好。这至少部分是由于双耳听觉系统抑制混响影响的能力。建议采用一个用于混响双耳静噪的暂定模型。将当前发现与现有数据进行比较；并提出临床应用建议。
This study investigated the effects of reverberation upon the speech discrimination performance of 30 normally hearing subjects and 30 persons with bilateral sensorineural hearing loss. Following preliminary tests, the Modified Rhyme Test was administered monaurally and binaurally at reverberation times of 0, 1, 2 and 3 sec. All stimuli were administered under earphones. The lists and conditions were appropriately randomized and counterbalanced so that each subject heard a test list at each reverberation time (RT) monaurally and binaurally. The expected gain due to binaural summation of loudness was simulated in order to test the possibility that any binaural enhancement of intelligibility might be due to binaural loudness summation. For all conditions, the normally hearing subjects performed significantly better than the hearing-impaired group. However, in relative terms, the two groups were remarkably similar. Binaural scores were significantly higher than monaural scores at each RT for both groups (in spite of homophasic conditions). For both groups, monaural and binaural scores decreased with increasing RT. Monaural scores decreased at a significantly faster rate with RT than did the binaural scores (the binaural advantage, however, was larger for the normal group). Increasing the monaural presentation levels to simulate the binaural loudness gain did not result in higher scores. It was concluded that speech discrimination under reverberation is better binaurally than monaurally for both normally hearing and hearing-impaired persons. This is due, at least partly, to the ability of the binaural auditory system to squelch the effects of reverberation. A tentative model is suggested for the binaural squelch of reverberation. The current findings are compared with existing data; and suggestions are offered for clinical application.