| 赵建平,原猛,冯海泓.WDRC释放时间对普通话言语理解度的影响研究[J].声学技术,2013,32(3):217~221 |
| WDRC释放时间对普通话言语理解度的影响研究 |
| Effect of release time in WDRC on mandarin speech intelligibility |
| 投稿时间：2012-11-06 修订日期：2013-02-07 |
| DOI：10.3969/j.issn1000-3630.2013.03.009 |
| 中文关键词: 宽动态范围压缩算法 释放时间 普通话 言语理解度 |
| 英文关键词: wide dynamic range compression release time mandarin speech intelligibility |
| 基金项目:国家自然科学基金(11104316); 上海市自然科学基金(11ZR1446000); 中国科学院声学研究所所长择优创新基金 (Y154221701); 美国斯达克科学研究基金资助项目。 |
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| 中文摘要: |
| 宽动态范围压缩算法作为助听器非线性听力补偿的核心算法, 其释放时间常数的设定可影响言语理解度。根据普通话的语音特点, 将宽动态范围压缩算法按频率范围划分为低频区间(<2000 Hz)和高频区间(>=2000 Hz), 并采用不同的释放时间常数。低频区间和高频区间释放时间常数均采用5 ms、100 ms及2000 ms, 但各自交叉配对为实验条件, 共形成9组实验条件。以正常听力者为实验对象, 通过仿真平台输出普通话言语仿真声, 进行噪声下普通话言语理解度测试。实验结果显示, 低频区间时间常数过短或高频区间时间常数过长都将影响普通话言语理解度。实验结论对我国助听器WDRC参数的设定有一定参考价值。 |
| 英文摘要: |
| In digital hearing aids, wide dynamic range compression algorithm (WDRC) is commonly treated as the core algorithm to compensate loudness. Differences between release time constants in WDRC can affect speech intelligibility (SI). Based on unique acoustic characteristics of Mandarin, WDRC algorithm are divided into two parts: low frequency (LF) channel and high frequency (HF) channel. Release time constants are taken as 5 ms, 100 ms, and 2000 ms in either LF channel or HF channel. Combining a certain LF release time constant with a certain HF one forms totally nine different release time combinations for hearing tests. Normal hearing objects go through the Mandarin SI tests with speech shaped noise. The testing material is Mandarin sentences which are the outputs of WDRC simulation in the 9 different release time combinations. Test results show that too short release time in LF channel or too long release time in HF channel trends to decrease Mandarin SI. The results can be a reference for WDRC parameter setting of Mandarin speaker. |
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