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  • Title: Frequency discrimination in quiet and in noise for signals with triangular spectral envelopes.
    Author: Horst JW, Ritsma RJ, Wit HP.
    Journal: J Acoust Soc Am; 1984 Oct; 76(4):1067-75. PubMed ID: 6501702.
    Abstract:
    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.
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