Spiegel M F
Bell Communications Research, Morristown, New Jersey 07960.
J Acoust Soc Am. 1987 Nov;82(5):1492-502. doi: 10.1121/1.395193.
This article reports on investigations of the relative roles of simultaneous and nonsimultaneous masking on detection thresholds using natural speech utterances. Thresholds were obtained for 15-ms probe tones placed in the stop or flap closures of /ada/ and /idi/. Threshold elevations due to simultaneous and nonsimultaneous masking could be explained by the dynamics of neighboring speech spectra. Nonsimultaneous effects were related to spectra at least 30 ms around the probe tone. Although simultaneous masking is usually stronger than nonsimultaneous masking, the relative amplitude of adjacent speech segments in natural speech is sufficiently high near formant regions to cause noticeable effects of nonsimultaneous masking.
本文报道了关于使用自然语音话语对同时掩蔽和非同时掩蔽在检测阈值方面的相对作用的研究。针对置于/ada/和/idi/的塞音或闪音闭塞处的15毫秒探测音，获取了阈值。同时掩蔽和非同时掩蔽导致的阈值升高可以通过相邻语音频谱的动态变化来解释。非同时效应与探测音周围至少30毫秒的频谱有关。尽管同时掩蔽通常比非同时掩蔽更强，但在共振峰区域附近，自然语音中相邻语音段的相对幅度足够高，足以引起明显的非同时掩蔽效应。
