Department of Speech and Hearing Science, Arizona State University, Tempe, AZ 85287, USA.
Int J Audiol. 2011 Jan;50(1):34-40. doi: 10.3109/14992027.2010.521198. Epub 2010 Nov 4.
The objective of this study was to examine the relation between bandwidth and speech perception in normally hearing adults and children at a single value of the Speech Intelligibility Index (SII).
The SII of meaningful and nonsense sentences were held constant for each of three bandwidths to test the hypothesis that perception would be equivalent in each condition. The sentences were filtered to produce three bandwidth conditions (low-pass cut-off frequency: 0.8, 1.25, 2.5 kHz) and the sensation level within each bandwidth was adjusted to produce a similar SII (0.43-0.48). Sentences were presented in broadband noise to facilitate equivalent audibility across subjects in each bandwidth condition.
Participants were 20 adults between the ages of 19 and 47 years and 20 eight-year-old children. All participants had normal hearing.
Contrary to the hypothesis, performance of both groups increased significantly as bandwidth increased. Significant main effects of group and sentence type were also found. These results indicate that performance was governed largely by the bandwidth of the stimuli and that those effects were not represented well in the SII.
本研究旨在探讨正常听力成人和儿童在言语可懂度指数（SII）单一值下的带宽与言语感知之间的关系。
为了检验感知在每种条件下都相等的假设，对有意义和无意义句子的 SII 进行了三种带宽的恒定测试。通过滤波产生三种带宽条件（低通截止频率：0.8、1.25、2.5 kHz），并调整每个带宽内的感觉水平以产生相似的 SII（0.43-0.48）。句子在宽带噪声中呈现，以促进每个带宽条件下受试者的等效可听度。
参与者为 20 名年龄在 19 至 47 岁之间的成年人和 20 名 8 岁儿童。所有参与者均有正常听力。
与假设相反，两组的表现都随着带宽的增加而显著提高。还发现了组和句子类型的显著主效应。这些结果表明，表现主要受刺激带宽的控制，而 SII 并不能很好地表示这些影响。
