The effect of a coding strategy that removes temporally masked pulses on speech perception by cochlear implant users
The effect of a coding strategy that removes temporally masked pulses on speech perception by cochlear implant users
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DOI：
10.1016/j.heares.2020.107969
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发表时间：
2020-06-01
期刊：
影响因子：
2.8
通讯作者：
Carlyon, Robert P.
中科院分区：
文献类型：
--
作者：
Lamping, Wiebke;Goehring, Tobias;Carlyon, Robert P.
对于人工耳蜗 (CI) 接受者来说，嘈杂环境中的语音识别仍然是一个挑战。电极通道内和电极通道之间的电流脉冲之间不需要的电荷相互作用可能会损害性能。在这里，我们研究减少电流脉冲数量对语音感知的影响。这是通过实施心理声学时间掩蔽模型来实现的，其中每个通道中的电流脉冲通过时间积分器来识别和消除接收者不太可能感知的脉冲。改变时间积分器的决策标准以控制每种条件下去除的脉冲的百分比。在实验 1 中，使用标准连续交错采样 (CIS) 策略处理安静语音，并删除 25%、50% 和 75% 的脉冲。在实验 2 中，使用 CIS 参考并去除 50% 和 75% 的脉冲来测量噪声中的语音性能。安静时的语音清晰度显示参考条件和测试条件之间没有显着差异。对于噪声中的语音，结果显示，当去除 50% 的脉冲时，性能显着提高 2.4 dB，并且参考与去除 75% 的脉冲时的性能没有显着差异。此外，通过将电流脉冲总量减少 25%、50% 和 75%，但考虑到补偿响度降低所需的电荷增加，对于这组听众来说，估计平均功率分别可节省 21.15%、40.95% 和 63.45%。总之，去除时间屏蔽脉冲可以改善噪声中的语音感知，并节省大量功率。 (C) 2020 作者。由 Elsevier B.V. 出版
Speech recognition in noisy environments remains a challenge for cochlear implant (CI) recipients. Unwanted charge interactions between current pulses, both within and between electrode channels, are likely to impair performance. Here we investigate the effect of reducing the number of current pulses on speech perception. This was achieved by implementing a psychoacoustic temporal-masking model where current pulses in each channel were passed through a temporal integrator to identify and remove pulses that were less likely to be perceived by the recipient. The decision criterion of the temporal integrator was varied to control the percentage of pulses removed in each condition. In experiment 1, speech in quiet was processed with a standard Continuous Interleaved Sampling (CIS) strategy and with 25, 50 and 75% of pulses removed. In experiment 2, performance was measured for speech in noise with the CIS reference and with 50 and 75% of pulses removed. Speech intelligibility in quiet revealed no significant difference between reference and test conditions. For speech in noise, results showed a significant improvement of 2.4 dB when removing 50% of pulses and performance was not significantly different between the reference and when 75% of pulses were removed. Further, by reducing the overall amount of current pulses by 25, 50, and 75% but accounting for the increase in charge necessary to compensate for the decrease in loudness, estimated average power savings of 21.15, 40.95, and 63.45%, respectively, could be possible for this set of listeners. In conclusion, removing temporally masked pulses may improve speech perception in noise and result in substantial power savings. (C) 2020 The Authors. Published by Elsevier B.V.