Logopedics, Phoniatrics and Audiology Section, Department of Clinical Science, Lund University, Lund, Sweden.
Int J Audiol. 2012 Mar;51(3):146-56. doi: 10.3109/14992027.2011.609183. Epub 2011 Oct 24.
Acceptable noise level (ANL) has been established as a method to quantify the acceptance of background noise while listening to speech presented at the most comfortable level. The aim of the present study was to generate Danish, Swedish, and a non-semantic version of the ANL test and investigate normal-hearing Danish and Swedish subjects' performance on these tests.
ANL was measured using Danish and Swedish running speech with two different noises: Speech-weighted amplitude-modulated noise, and multitalker speech babble. ANL was also measured using the non-semantic international speech test signal (ISTS) as speech signal together with the speech-weighted amplitude-modulated noise. The latter condition was identical in both populations.
Forty Danish and 40 Swedish normal-hearing subjects.
In both populations ANL results were similar to previously reported results from American studies. Generally, significant differences were seen between test conditions using different types of noise within ears in each population. Significant differences were seen for ANL across populations, also when the non-semantic ISTS was used as speech signal.
The present findings indicate that there are extrinsic factors, such as instructions, affecting the ANL results.
可接受噪声级 (ANL) 已被确立为一种方法，用于量化在最舒适的水平下聆听语音时对背景噪声的接受程度。本研究的目的是生成丹麦语、瑞典语和非语义版的 ANL 测试，并研究丹麦和瑞典正常听力受试者在这些测试中的表现。
使用丹麦语和瑞典语的连续语音，并使用两种不同的噪声来测量 ANL：语音加权调幅噪声和多说话者语音杂音。还使用非语义国际语音测试信号 (ISTS) 作为语音信号，并与语音加权调幅噪声一起测量 ANL。后一种情况在两个群体中是相同的。
40 名丹麦正常听力受试者和 40 名瑞典正常听力受试者。
在两个群体中，ANL 的结果与之前来自美国研究的报告结果相似。通常，在每个群体中，使用不同类型的噪声在耳朵内的测试条件之间会出现显著差异。在不同群体之间，即使使用非语义 ISTS 作为语音信号，也会出现 ANL 差异。
本研究结果表明，存在影响 ANL 结果的外在因素，例如指令。
