Specifying a multirate digital filter based on a ratio of an input sample rate to an output sample rate

摘要

Approaches for preparing a design of a digital multirate filter. In one approach, an objective function and an input and output characteristic are input for determining an effectiveness of a plurality of filters. The characteristic includes an overall rate change value that specifies a ratio of an input to an output sample rate. The overall rate change value is factored into a plurality of ordered sets, and the overall rate change value is a product of the factors in the ordered sets. Each of the filters corresponds to one of the ordered sets and includes a respective stage for each factor in the ordered set. One of the filters is selected based on respective values determined from evaluating an objective function for the filters, and the factor(s) in the ordered set that corresponds to the selected one of the filters is stored.