Comodulation masking release using SAM tonal complex maskers: effects of modulation depth and signal position.
Comodulation masking release using SAM tonal complex maskers: effects of modulation depth and signal position.
复制标题
使用 SAM 音调复合掩蔽器进行共调制掩蔽释放：调制深度和信号位置的影响。
DOI：
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复制
发表时间：
1989
影响因子：
2.4
通讯作者：
J. Hall
中科院分区：
文献类型：
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作者：
J. Grose;J. Hall
本研究的目的是检查两个刺激参数，理由是重要的共调节掩蔽释放（CMR）。第一个是掩蔽带中的波动程度或调制深度，第二个是信号相对于掩蔽的调制的时间位置。调查开始于证明正弦幅度调制（SAM）音调复合掩蔽剂在诱发CMR中的功效。“九波段”掩蔽，持续时间650毫秒，是通过将9个SAM音调加在一起构建的，这些SAM音调以100 Hz的间隔从300 Hz到1100 Hz。每个SAM音调的调制速率为10 Hz，调制深度为100%。使用这样的掩蔽物，它被证明，当频率SAM音调具有100%的调制深度时，250 ms，700 Hz音调的阈值随着侧翼SAM音调的调制深度从0%增加到100%而单调地提高。当同频SAM音调的调制深度为63%时，一些听众在侧翼SAM音调也表现出63%的调制深度时表现最佳，而另一些听众在侧翼调制深度为100%时表现最佳。关于信号的位置，一个典型的CMR效应时，观察到的信号，由三个50毫秒，700赫兹的短纯音组成的列车，被放置在下降的频率掩蔽。然而，当信号被放置在包络的峰值处时，观察到复合掩蔽物的掩蔽增加。（250字处删节）
The purpose of this investigation was to examine two stimulus parameters that were reasoned to be of importance to comodulation masking release (CMR). The first was the degree of fluctuation, or depth of modulation, in the masker bands, and the second was the temporal position of the signal with respect to the modulations of the masker. The investigation began by demonstrating the efficacy of sinusoidally amplitude-modulated (SAM) tonal complex maskers in eliciting CMR. "Nine-band" maskers, 650 ms in duration, were constructed by adding together nine SAM tones spaced at 100-Hz intervals from 300 to 1100 Hz. The rate of modulation for each SAM tone was 10 Hz, and the depth of modulation was 100%. Using such maskers, it was shown that when the on-frequency SAM tone had a modulation depth of 100%, the threshold for a 250-ms, 700-Hz tone improved monotonically as the modulation depths of the flanking SAM tones increased from 0% to 100%. When the on-frequency SAM tone had a modulation depth of 63%, some listeners performed optimally when the flanking SAM tones also exhibited a modulation depth of 63%, whereas others performed best when the flankers had modulation depths of 100%. With regard to signal position, a typical CMR effect was observed when the signal, consisting of a train of three 50-ms, 700-Hz tone bursts, was placed in the dips of the on-frequency masker. However, when the signal was placed at the peaks of the envelope, an increase in masking was observed for a comodulated masker.(ABSTRACT TRUNCATED AT 250 WORDS)