Children's speech recognition in noise using omni-directional and dual-microphone hearing aid technology
Children's speech recognition in noise using omni-directional and dual-microphone hearing aid technology
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DOI：
10.1097/00003446-199902000-00001
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发表时间：
1999-02-01
期刊：
影响因子：
3.7
通讯作者：
Chobot, J
中科院分区：
文献类型：
--
作者：
Gravel, JS;Fausel, N;Chobot, J
目的：研究儿童在使用全方位和双麦克风助听器技术时对背景噪声中出现的单词和句子的语音识别能力。设计：20名双侧耳蜗性听力损失(平均四频听力损失=57.25dBHL，范围：轻度到重度)儿童，10名4~6岁儿童，10名7~11岁儿童。自适应测试程序被用来估计在多说话者背景竞争中使个体语音识别能力降低到50%的信噪比(SNR)。测试是在孩子坐在传统的听力学测试套件中完成的。通过位于0度的扬声器传送固定电平的语音信号；在180度处呈现以2分贝步长变化的噪声。结果：混合设计的方差分析显示，儿童在使用双耳可编程助听器(Phonak PICS)时，在传统的全向和双麦克风(Audio Zoom)条件下进行了测试。结果：麦克风条件、语音材料类型(单词和句子)、年龄组(“年轻”和“年长”)均有显著影响，总体上，儿童在使用双麦克风条件下的平均听音优势为4.7分贝。儿童的表现与他们的实际年龄和语言年龄(接受性词汇)相关，但与他们的听力损失程度无关(除一种情况外)。年龄较小的儿童需要更有利的信噪比才能达到与年龄较大的儿童相同的表现标准。结论：在本调查所使用的特定测试条件下，对于轻度到重度耳蜗性听力损失的儿童，对于单词和句子测试材料，双麦克风助听器技术在背景竞争中比传统的全方位麦克风具有显著的收听优势。
Objective: The purpose of this study was to examine children's speech recognition abilities for words and sentences presented in background noise when the children used omni-directional and dual-microphone hearing aid technology.Design: Twenty children (ten 4- to 6-yr olds; ten 7- to 11-yr-olds) with bilateral cochlear hearing loss (average four-frequency hearing loss = 57.25 dB HL; range: mild to severe) were included in the study. An adaptive test procedure was used to estimate a signal to noise ratio (SNR) that reduced individual speech recognition ability to 50% in multi-talker background competition. Testing was completed with the child seated in a conventional audiologic test suite. A fixed level of the speech signal was delivered through a loudspeaker located at 0 degrees; noise varying in 2 dB steps was presented at 180 degrees. SNR was estimated for two types of speech materials (closed-set words and sentences), Children wore binaural programmable hearing aids (Phonak PiCS) and were tested in conventional omni-directional and dual-microphone ("Audio Zoom") conditions.Results: Significant effects of microphone condition, speech material type (words and sentences), and age group ("younger" and "older") were revealed by mixed design analysis of variance, Overall, children received a mean advantage of 4.7 dB from listening in the dual-microphone condition. Children's performance was correlated with their chronological age and language age (receptive vocabulary) but not with their degree of hearing loss (except in one condition). Younger children required a more advantageous SNR to achieve the same performance criteria as older children.Conclusions: Under the specific test conditions used in this investigation, dual-microphone hearing aid technology provided a significant listening advantage in background competition over conventional omni-directional microphones for children with mild to severe cochlear hearing loss for both word and sentence test materials.