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We present a new technique for estimating the generalized transfer function GTF of a time varying lter from time frequency representations TFRs of its output. We use the fact that many of these representations can be written as blurred versions of the GTF. The approach consists in minimizing the error between the TFR found from the data and that found by blurring the GTF. The problem as such has many solutions. We, therefore, additionally constrain it to minimize the distance between the GTFdoi:10.1109/78.774782 fatcat:izpqzpu7efacpksrgs3r26iecm