Discrimination of Schroeder-phase harmonic complexes by normal-hearing and cochlear-implant listeners
Discrimination of Schroeder-phase harmonic complexes by normal-hearing and cochlear-implant listeners
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DOI：
10.1007/s10162-007-0107-6
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发表时间：
2008-03-01
影响因子：
2.4
通讯作者：
Rubinstein, Jay T.
中科院分区：
文献类型：
--
作者：
Drennan, Ward R.;Longnion, Jeff K.;Rubinstein, Jay T.
声音的时间精细结构(TFS)在噪声中对音乐和语音的感知有重要作用。在评估精细结构编码的基础上，评估改善人工耳蜗(Cis)遗迹中TFS传递的新策略。大多数现代CI声音处理方案本身并不编码声道内的TFS，但一些TFS信息通过跨多个声道的时间包络线索来传递。正、负施罗德相谐波的主要区别在于声学TFS，并为当前和未来的处理策略提供了对CI用户TFS辨别能力的潜在测试。对24名CI使用者和7名听力正常的听者在4个基频：50、100、200和400赫兹下辨别施罗德相刺激的能力进行了评估。因变量在每个基频上的准确率为百分比，所有基频上的平均得分，以及最大似然预测阈值基频的准确率为75%。在所有测试的基本频率中，CI听众的得分都高于随机得分。50赫兹、平均和预测阈值得分与辅音-核心-辅音单词得分显著相关。200赫兹的分数与语音形状噪音中的语音感知程度相关。音调方向敏感度由400赫兹施罗德分数和光谱波纹辨别任务联合预测。结果表明，施罗德测验是一种潜在的有用的测量临床相关的时间加工能力的CI使用者。
The temporal fine structure (TFS) of sound contributes significantly to the perception of music and speech in noise. The evaluation of new strategies to improve TFS delivery in cochlear implants (CIs) relics upon the assessment of fine structure encoding. Most modern CI sound processing schemes do not encode within-channel TFS per se, but some TFS information is delivered through temporal envelope cues across multiple channels. Positive and negative Schroeder-phase harmonic complexes differ primarily in acoustic TFS and provide a potential test of TFS discrimination ability in CI users for current and future processing strategies. The ability to discriminate Schroeder-phase stimuli was evaluated in 24 CI users and 7 normal-hearing listeners at four fundamental frequencies: 50, 100, 200, and 400 Hz. The dependent variables were percent correct at each fundamental frequency, average score across all fundamental frequencies, and a maximum-likelihood-predicted threshold fundamental frequency for 75% correct. CI listeners scored better than chance for all fundamental frequencies tested. The 50-Hz, average, and predicted threshold scores correlated significantly with consonant-nucleus-consonant word scores. The 200-Hz score correlated with a measure of speech perception in speech-shaped noise. Pitch-direction sensitivity is predicted jointly by the 400-Hz Schroeder score and a spectral ripple discrimination task. The results demonstrate that the Schroeder test is a potentially useful measure of clinically relevant temporal processing abilities in CI users.