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A spreading function which takes
into account both inband masking and interband masking is
(taken from [2])

(9) 
where is the frequency in barks.
This equation is modified to take into account the decreasing slope at
higher masker amplitudes in the following manner:

(10) 
where
, is the
frequency of the masker and is the critical bandwidth at . A
higher value of gives a flatter , and the formula for is
an experimentally found heuristic which compensates a frequency bin if it
is only a small part of a wide critical band. Setting the max of to
2.0 was necessary for some test sounds, where e.g a base drum could make
a large part of the high frequency spectra vanish.
See Fig. 3 for an illustration of the spread function.
Figure 3:
The masking spread function for a single
masker. The scaled amplitude i varies from 0 to 2, where 2 corresponds
to the wider spread.

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