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.