Fantini D A, Emmerich D S
State University of New York at Stony Brook 11794.
J Acoust Soc Am. 1987 Nov;82(5):1593-7. doi: 10.1121/1.395148.
Previous research has indicated that frequency discrimination performance is poorer for tones presented near the sharp spectral edge of a low-pass noise than for tones presented near the edge of a high-pass noise, or for tones in the same low-pass noise with high-pass noise added [Emmerich et al., J. Acoust. Soc. Am. 80, 1668-1672 (1986)]. The present study extends these findings in order to investigate how the steepness of the spectral edges of low- and high-pass maskers influences the discriminability of tones presented near these edges. Frequency discrimination was measured in each of three high- and low-pass noise backgrounds (which differed in the steepness of their filter skirts). The following results were obtained: (1) In the low-pass noise background, frequency discrimination performance improved as the filter skirt became more gradual; (2) in the high-pass noise background, performance first improved and then became poorer as the filter skirt became shallower; and (3) performance in low-pass noise was poorer than that in high-pass noise for the two steepest slopes employed (96 and 72 dB/oct) but not for the shallower slope (36 dB/oct). Results are discussed in the context of lateral suppression and edge pitch effects, and of a trade-off between possible edge effects and masking.
先前的研究表明，对于呈现于低通噪声尖锐频谱边缘附近的纯音，其频率辨别性能要比呈现于高通噪声边缘附近的纯音，或者比添加了高通噪声的同一低通噪声中的纯音更差[埃默里希等人，《美国声学学会杂志》80, 1668 - 1672 (1986)]。本研究扩展了这些发现，以探究低通和高通掩蔽声频谱边缘的陡峭程度如何影响呈现于这些边缘附近纯音的可辨别性。在三种高通和低通噪声背景（它们的滤波器裙边陡峭程度不同）中的每一种背景下测量了频率辨别。获得了以下结果：(1) 在低通噪声背景下，随着滤波器裙边变得更平缓，频率辨别性能得到改善；(2) 在高通噪声背景下，随着滤波器裙边变浅，性能先改善而后变差；以及(3) 对于所采用的两个最陡峭斜率（96和72 dB/倍频程），低通噪声中的性能比高通噪声中的差，但对于较平缓的斜率（36 dB/倍频程）并非如此。在侧向抑制和边缘音调效应的背景下，以及在可能的边缘效应与掩蔽之间的权衡背景下对结果进行了讨论。
