A glimpsing account for the benefit of simulated combined acoustic and electric hearing
A glimpsing account for the benefit of simulated combined acoustic and electric hearing
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DOI：
10.1121/1.2839013
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发表时间：
2008-04-01
影响因子：
2.4
通讯作者：
Loizou, Philipos C.
中科院分区：
文献类型：
--
作者：
Li, Ning;Loizou, Philipos C.
电声联合刺激（EAS）在噪声中的语音识别方面的好处已经得到了很好的证实;然而，导致这种好处的潜在因素尚不清楚。本研究测试的假设，即有机会在低频率的声学信息，使其更容易为听众瞥见的目标。听力正常的听众单独的语音编码（V），低通（LP）滤波的语音单独，结合语音编码和LP语音（LP+V）和语音编码的刺激，使低频包络更容易看到。目标语音与两种类型的掩蔽者（稳态噪声和竞争说话者）以-5至5 dB信噪比混合。结果表明，LP+V在稳定的噪声中没有优势，但在竞争性谈话者背景中比V有显著优势，这一结果与听众更容易在波动的掩蔽声中瞥见目标的概念一致。一个显着的改善性能，指出与修改后的瞥见刺激在原来的声码刺激。这些研究结果表明，EAS优势的一个重要因素是增强了瞥见目标的能力。(C)2008年，美国声学学会。
The benefits of combined electric and acoustic stimulation (EAS) in terms of speech recognition in noise are well established; however the underlying factors responsible for this benefit are not clear. The present study tests the hypothesis that having access to acoustic information in the low frequencies makes it easier for listeners to glimpse the target. Normal-hearing listeners were presented with vocoded speech alone (V), low-pass (LP) filtered speech alone, combined vocoded and LP speech (LP+V) and with vocoded stimuli constructed so that the low-frequency envelopes were easier to glimpse. Target speech was mixed with two types of maskers (steady-state noise and competing talker) at -5 to 5 dB signal-to-noise ratios. Results indicated no advantage of LP+V in steady noise, but a significant advantage over V in the competing talker background, an outcome consistent with the notion that it is easier for listeners to glimpse the target in fluctuating maskers. A significant improvement in performance was noted with the modified glimpsed stimuli over the original vocoded stimuli. These findings taken together suggest that a significant factor contributing to the EAS advantage is the enhanced ability to glimpse the target. (C) 2008 Acoustical Society of America.