Adding simultaneous stimulating channels to reduce power consumption in cochlear implants
Adding simultaneous stimulating channels to reduce power consumption in cochlear implants
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DOI：
10.1016/j.heares.2017.01.010
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发表时间：
2017-03-01
期刊：
影响因子：
2.8
通讯作者：
Nogueira, Waldo
中科院分区：
文献类型：
--
作者：
Langner, Florian;Saoji, Aniket A.;Nogueira, Waldo
用于耳蜗植入（CI）收听器的声音编码策略可用于控制语音性能和功耗之间的权衡。大多数商业CI策略使用非同时通道刺激，一次仅刺激一个电极。可以添加并行的同时刺激通道，使得通道之间的电相互作用增加。这将产生频谱拖尾，因为同时刺激的通道的电场相互作用，而且还节省功率。平行通道产生的感觉比顺序刺激更响亮。为了测试这一假设，我们使用Advanced Bionics的研究接口实施了不同的声音编码策略：使用顺序通道刺激的商业F120策略（一个通道相当于两个电极，具有电流导向）和配对策略，包括两个通道的同时刺激。在这里，两个通道的电场将相互作用，每个通道上需要更少的电流才能感知与F120相同的响度。然而，独立通道之间的通道交互可能降低语音识别或理解。这可以通过在两个通道之间添加反极性刺激通道来减少。这种策略被称为与侧翼配对。此外，研究了具有三个通道和相邻侧翼样式的Triplet。对于每种策略，我们测量的Hochmair-Schulz-Moser句子测试的语音清晰度。使用光谱调制深度检测任务评估光谱分辨率。结果表明，与F120相比，Paired without Flanks获得了类似的性能，同时平均降低了20%的电流。与F120相比，具有和不具有侧翼的Triplet显示出总体较差的性能。所有策略都禁止增加脉冲宽度的选项，这将导致甚至进一步降低功耗。(C)2017 Elsevier B. V.版权所有。
Sound coding strategies for Cochlear Implant (CI) listeners can be used to control the trade-off between speech performance and power consumption. Most commercial CI strategies use non-simultaneous channel stimulation, stimulating only one electrode at a time. One could add parallel simultaneous stimulating channels such that the electrical interaction between channels is increased. This would produce spectral smearing, because the electrical fields of the simultaneous stimulated channels interact, but also power savings. The parallel channels produce a louder sensation than sequential stimulation. To test this hypothesis we implemented different sound coding strategies using a research interface from Advanced Bionics: the commercial F120 strategy using sequential channel stimulation (one channel equals two electrodes with current steering) and the Paired strategy, consisting of simultaneous stimulation with two channels. Here, the electrical field of both channels will interact, requiring less current on each channel to perceive the same loudness as with F120. However, channel interaction between the independent channels may reduce speech recognition or understanding. This can be diminished by adding an inverse-polarity stimulation channel between both channels. This strategy is termed Paired with Flanks. Additionally, Triplet with three channels and an adjacent Flank style was investigated. For each strategy we measured speech intelligibility with the Hochmair-Schulz-Moser sentence test. Spectral resolution was assessed using a spectral modulation depth detection task. Results show that Paired without Flanks obtains similar performance while reducing the current by 20% on average compared to F120. Triplet with and without Flanks shows overall poorer performance when compared to F120. All strategies inhibit the option to increase the pulse width which would result in even further decreased power consumption. (C) 2017 Elsevier B.V. All rights reserved.