Digital filters are presented which are designed to equalize frequency-domain characteristics such as, for example, the magnitude and phase responses of analog systems which are parts of combined analog and digital audio signal processing. Numerical examples show the advantages that can be obtained through equalization by mean of digital filters. Several audio applications, such as antialiasing filters, loudspeaker equalizing, and equalization of SD data converters, are presented. Some closely related topics such as efficient multirate filter realization, parametric modeling, and the comparison of recursive and nonrecursive digital filters are studied.
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