Exploring the role of the modulation spectrum in phoneme recognition.
Exploring the role of the modulation spectrum in phoneme recognition.
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DOI：
10.1097/aud.0b013e31817e73ef
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发表时间：
2008-10
期刊：
影响因子：
3.7
通讯作者：
Souza P
中科院分区：
文献类型：
--
作者：
Gallun F;Souza P
人类听者识别辅音（无意义音节）的主要时间信息的基础上的能力进行了比较与预测的一个简单的模型的基础上的振幅调制频谱的刺激计算为6倍频程间隔的载波频率（250-8000 Hz）和6倍频程间隔的振幅调制频率（1-32 Hz）。听众和模型被呈现为十六个音素，每个音素由四个不同的说话者说出，处理后保留一个、两个、四个或八个频谱信息带。提取每个处理后的音素的平均调制频谱，并通过使用频谱相关指数（SCI）计算音素之间的相似性。由SCI评估的音素之间的调制谱的相似性是人类听众所造成的混淆的强有力的预测。这一结果表明，一组稀疏的时间平均模式的调制能量可以捕获一个有意义的方面的信息，听众使用语音信号之间的区别。
The ability of human listeners to identify consonants (presented as nonsense syllables) on the basis of primarily temporal information was compared with the predictions of a simple model based on the amplitude modulation spectra of the stimuli calculated for six octave-spaced carrier frequencies (250-8000 Hz) and six octave-spaced amplitude modulation frequencies (1-32 Hz). The listeners and the model were presented with sixteen phonemes each spoken by four different talkers processed so that one, two, four or eight bands of spectral information remained. The average modulation spectrum of each of the processed phonemes was extracted and similarity across phonemes was calculated by the use of a spectral correlation index (SCI). The similarity of the modulation spectra across phonemes as assessed by the SCI was a strong predictor of the confusions made by human listeners. This result suggests that a sparse set of time-averaged patterns of modulation energy can capture a meaningful aspect of the information listeners use to distinguish among speech signals.