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A new discrete time approach to solving the group delay approximation problem is presented using digital allpass functions for equalizing a digital recursive filter or communications channel. When dcsigning a digital Infinite Impulse Response (IIR) filter to meet given amplitudc requirements it may also be necessary to design a digital delay equalizer to meet phase distortion requirements. The paper presents a novel algorithm for personal computers, called TWO STAGE, for finding the digital allpass transfer function that meets a given requirement on delay error which is defined as:Typically the percentage error achieved by TWO STAGE can be less than 1 % if nceded and is a function of the number of allpass sections used for a givcn bandwidth-the morc allpass sections the smaller the error.

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