ADJUSTABLE ANTIALIAS FILTERS

摘要

A programmable sampled data subsampling system includes a programmable antialias filter which bandlimlts the information bandwidth of the signal to be subsampled in accordance with the subsampling rate. The antialias filter includes a recursive filter which scales and combines (304,306,308) input samples and delayed (310) combined samples in proportions of K and (1-K) where K is a variable. The variables K are applied (314,316,318) to the recursive filter in repeating sequences of N values of K where N is the subsampling factor. Every N<th> combined sample is extracted (312,320) and provided as the subsampled signal.