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oversubtraction corner frequency

In the matlab script specsubm.m ,which can be found in voicebox, "oversubtraction corner frequency " is used to compute the oversubtraction factor. The code of specsubm.m is a program of spectral subtraction method based on minimum statistics.

% 6: fo = oversubtraction corner frequency (800): high=distortion, low=musical


But in the listed literature of spectrum.m, I did not find any information about "oversubtraction corner frequency".

Where can I find the concept about  "oversubtraction corner frequency"? How to apply it?


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