Horst J W, Ritsma R J, Wit H P
J Acoust Soc Am. 1984 Oct;76(4):1067-75. doi: 10.1121/1.391347.
The just-noticeable-difference in frequency (jndf) for complex signals with triangular spectral envelopes is found to depend on the envelope slope. For shallow slopes (less than 140 dB/oct), jndf increases with decreasing slope. Addition of noise also impairs frequency discrimination within a region of about 20 dB above masked threshold. This is found for both maskers used: a wideband noise and a narrow-band masker which is below the signal in frequency. When wideband noise is used, frequency discrimination of complex signals with shallow slopes deteriorates more rapidly with decreasing signal-to-noise ratio than it does when the signals have steep spectral slopes.
对于具有三角形频谱包络的复杂信号，其频率的刚可察觉差异（jndf）被发现取决于包络斜率。对于较浅的斜率（小于140 dB/倍频程），jndf随着斜率的减小而增加。在高于掩蔽阈值约20 dB的区域内，添加噪声也会损害频率辨别能力。对于所使用的两种掩蔽器均发现了这一点：宽带噪声和频率低于信号的窄带掩蔽器。当使用宽带噪声时，与具有陡峭频谱斜率的信号相比，具有浅斜率的复杂信号的频率辨别能力随信噪比降低而恶化得更快。
