Description: Wiener filter based on tracking a priori SNR usingDecision-Directed
method, proposed by Scalart et al 96. In this method it is assumed that
SNRpost=SNRprior +1. based on this the Wiener Filter can be adapted to a
model like Ephraims model in which we have a gain function which is a
function of a priori SNR and a priori SNR is being tracked using Decision
Directed method.
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