A new sound coding strategy for suppressing noise in cochlear implants.
A new sound coding strategy for suppressing noise in cochlear implants.
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DOI：
10.1121/1.2924131
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发表时间：
2008-07
期刊：
影响因子：
--
通讯作者：
Loizou PC
中科院分区：
文献类型：
--
作者：
Hu Y;Loizou PC
在n-of-m策略中，通过m个带通滤波器处理信号，仅从其中选择n个最大包络幅度用于刺激。虽然在高级组合编码器（ACE）策略中采用的这种最大值选择标准在安静时工作良好，但它在噪声中可能存在问题，因为它对输入信号的频谱组成敏感，并且不考虑掩蔽物完全主导目标的情况。提出了一种新的基于单个通道信噪比（SNR）的选择准则。新准则选择目标主导（SNR≥0 dB）信道，丢弃掩蔽主导（SNR<0 dB）信道。实验1在信道信噪比已知的情况下，采用所提出的策略评估人工耳蜗使用者的性能。实验结果表明，该方法可以使语音清晰度恢复到安静时的水平，与掩蔽噪声（混串音或连续噪声）和信噪比（0-10 dB）无关。实验2的结果表明，在不影响语音清晰度的情况下，可以容忍25%的错误率。总的来说，本研究的结果表明，SNR标准是一个有效的选择标准的N-的M战略的潜力，恢复语音清晰度。
In the n-of-m strategy, the signal is processed through m bandpass filters from which only the n maximum envelope amplitudes are selected for stimulation. While this maximum selection criterion, adopted in the Advanced Combination Encoder (ACE) strategy, works well in quiet, it can be problematic in noise as it is sensitive to the spectral composition of the input signal and does not account for situations in which the masker completely dominates the target. A new selection criterion is proposed based on the signal-to-noise ratio (SNR) of individual channels. The new criterion selects target-dominated (SNR≥0 dB) channels and discards masker-dominated (SNR<0 dB) channels. Experiment 1 assessed cochlear implant users’ performance with the proposed strategy assuming that the channel SNRs are known. Results indicated that the proposed strategy can restore speech intelligibility to the level attained in quiet, independent of the type of masker (babble or continuous noise) and SNR level (0–10 dB) used. Results from Experiment 2 showed that a 25% error rate can be tolerated in channel selection without compromising speech intelligibility. Overall, the findings from the present study suggest that the SNR criterion is an effective selection criterion for n-of-m strategies with the potential of restoring speech intelligibility.
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影响因子：
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作者：
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通讯作者：
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