Comparing Binaural Pre-processing Strategies II: Speech Intelligibility of Bilateral Cochlear Implant Users.
Comparing Binaural Pre-processing Strategies II: Speech Intelligibility of Bilateral Cochlear Implant Users.
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DOI：
10.1177/2331216515617917
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发表时间：
2015-12-30
影响因子：
2.7
通讯作者：
Dietz M
中科院分区：
文献类型：
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作者：
Baumgärtel RM;Hu H;Krawczyk-Becker M;Marquardt D;Herzke T;Coleman G;Adiloğlu K;Bomke K;Plotz K;Gerkmann T;Doclo S;Kollmeier B;Hohmann V;Dietz M
评价了几种双耳音频信号增强算法在改善双侧人工耳蜗（CI）用户噪声中语音清晰度方面的潜力。50%的语音接收阈值（SRT 50）进行了评估，使用自适应程序在三个不同的，现实的噪音情况。所有场景都是高度非平稳的，复杂的，并包括大量的混响。其他方面，如完美的正面目标位置，是理想化的实验室设置，使算法的性能优于相应的现实世界条件。八名双侧植入CI的用户，佩戴来自三家制造商的设备，参加了这项研究。在所有噪声条件下，对于大多数测试的算法，观察到SRT 50与未处理信号相比的实质性改善，其中最大的改善通常由双耳最小方差无失真响应（MVDR）波束成形算法提供。最大的语音清晰度的整体改善，实现了自适应双耳MVDR在空间上分离的，单一的竞争谈话者噪声的情况。无预处理条件和无双耳链路的自适应差分麦克风用作两个基线条件。双耳MVDR波束形成器提供的SRT 50改进在大多数情况下超过了自适应差分麦克风的性能。言语可懂度的改善预测的仪器措施被证明占一些，但不是所有方面的感知获得SRT 50改善测量双侧植入CI用户。
Several binaural audio signal enhancement algorithms were evaluated with respect to their potential to improve speech intelligibility in noise for users of bilateral cochlear implants (CIs). 50% speech reception thresholds (SRT50) were assessed using an adaptive procedure in three distinct, realistic noise scenarios. All scenarios were highly nonstationary, complex, and included a significant amount of reverberation. Other aspects, such as the perfectly frontal target position, were idealized laboratory settings, allowing the algorithms to perform better than in corresponding real-world conditions. Eight bilaterally implanted CI users, wearing devices from three manufacturers, participated in the study. In all noise conditions, a substantial improvement in SRT50 compared to the unprocessed signal was observed for most of the algorithms tested, with the largest improvements generally provided by binaural minimum variance distortionless response (MVDR) beamforming algorithms. The largest overall improvement in speech intelligibility was achieved by an adaptive binaural MVDR in a spatially separated, single competing talker noise scenario. A no-pre-processing condition and adaptive differential microphones without a binaural link served as the two baseline conditions. SRT50 improvements provided by the binaural MVDR beamformers surpassed the performance of the adaptive differential microphones in most cases. Speech intelligibility improvements predicted by instrumental measures were shown to account for some but not all aspects of the perceptually obtained SRT50 improvements measured in bilaterally implanted CI users.