Effects of envelope bandwidth on the intelligibility of sine- and noise-vocoded speech
Effects of envelope bandwidth on the intelligibility of sine- and noise-vocoded speech
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DOI：
10.1121/1.3158835
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发表时间：
2009-08-01
影响因子：
2.4
通讯作者：
Rosen, Stuart
中科院分区：
文献类型：
--
作者：
Souza, Pamela;Rosen, Stuart
声码信号的处理参数的选择可能对各种听觉特征的可用性具有重要影响。实验I改变了包络截止频率（30和300 Hz），载波类型（正弦和噪声），和频带数（2-5）的声码语音呈现给听力正常的听众。对于正弦声码，高截止值的性能更好，而对于噪声声码，截止值没有影响。在低截止值的情况下，噪声声码的性能比正弦声码好。对于高截止，正弦声码的性能更好。实验2测量了音高变化线索的可感知性。噪声载波结合高截止允许语调被认为在一定程度上，但性能最好的高截止正弦条件。低截止导致最差的性能，无论运营商。实验3测试了跨频带和频谱密度的共调制对改善正弦载波和高截止性能的相对贡献。跨频带的共调制没有影响，因此看起来提供更密集频谱的边带改善了性能。这些结果表明，载波类型结合包络截止可以改变声码语音中的可用线索，这些因素必须考虑在解释结果与声码信号。(C)2009年，美国声学学会。[DOI 10.1121/1.3158835]
The choice of processing parameters for vocoded signals may have an important effect on the availability of various auditory features. Experiment I varied envelope cutoff frequency (30 and 300 Hz), carrier type (sine and noise), and number of bands (2-5) for vocoded speech presented to normal-hearing listeners. Performance was better with a high cutoff for sine-vocoding, with no effect of cutoff for noise-vocoding. With a low cutoff, performance was better for noise-vocoding than for sine-vocoding. With a high cutoff, performance was better for sine-vocoding. Experiment 2 measured perceptibility of cues to voice pitch variations. A noise carrier combined with a high cutoff allowed intonation to be perceived to some degree but performance was best in high-cutoff sine conditions. A low cutoff led to poorest performance, regardless of carrier. Experiment 3 tested the relative contributions of comodulation across bands and spectral density to improved performance with a sine carrier and high cutoff. Comodulation across bands had no effect so it appears that sidebands providing a denser spectrum improved performance. These results indicate that carrier type in combination with envelope cutoff can alter the available cues in vocoded speech, factors which must be considered in interpreting results with vocoded signals. (C) 2009 Acoustical Society of America. [DOI: 10.1121/1.3158835]