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A Method to enhance the use of interaural time differences for cochlear implants in reverberant environments

机译:一种在混响环境中增强耳间植入物使用耳间时间差的方法

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摘要

The ability of normal-hearing (NH) listeners to exploit interaural time difference (ITD) cues conveyed in the modulated envelopes of high-frequency sounds is poor compared to ITD cues transmitted in the temporal fine structure at low frequencies. Sensitivity to envelope ITDs is further degraded when envelopes become less steep, when modulation depth is reduced, and when envelopes become less similar between the ears, common factors when listening in reverberant environments. The vulnerability of envelope ITDs is particularly problematic for cochlear implant (CI) users, as they rely on information conveyed by slowly varying amplitude envelopes. Here, an approach to improve access to envelope ITDs for CIs is described in which, rather than attempting to reduce reverberation, the perceptual saliency of cues relating to the source is increased by selectively sharpening peaks in the amplitude envelope judged to contain reliable ITDs. Performance of the algorithm with room reverberation was assessed through simulating listening with bilateral CIs in headphone experiments with NH listeners. Relative to simulated standard CI processing, stimuli processed with the algorithm generated lower ITD discrimination thresholds and increased extents of laterality. Depending on parameterization, intelligibility was unchanged or somewhat reduced. The algorithm has the potential to improve spatial listening with CIs.
机译:与在低频中以时间精细结构传输的ITD提示相比,正常听力(NH)的听众利用在高频声音的调制包络中传递的听觉时间差(ITD)提示的能力很差。当包络变得不那么陡峭,调制深度减小以及当耳朵之间的包络变得不太相似时,对包络ITD的灵敏度会进一步下降,这是在混响环境中收听时的共同因素。对于人工耳蜗(CI)使用者,信封式ITD的脆弱性尤其成问题,因为它们依赖于振幅变化缓慢的信封所传达的信息。在这里,描述了一种改善CI对包络ITD的访问的方法,其中,不是试图减少混响,而是通过有选择地锐化被判断为包含可靠ITD的幅度包络中的峰值,来增加与源相关的提示的感知显着性。在带有NH监听器的耳机实验中,通过模拟双边CI的监听来评估带有房间混响的算法的性能。相对于模拟的标准CI处理,用该算法处理的刺激产生了较低的ITD鉴别阈值和增加的横向程度。根据参数设置,清晰度没有变化或有所降低。该算法具有使用CI改善空间收听的潜力。

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