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masking threshold becomes zero when masker and maskee are the same frequency in model 1

Mengli

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According to the spreading function in psychoacoustic model 1, when dz (masker-maskee separation)=0, the spl of the masking threshold is zero, which is obviously not true in real cases.

Is there any reason the spreading function is like this?
SF model1 Lin 2015.png
 

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