![]() This adds noise and difference signals to the digitized signal. Any noise or signal frequencies above 1/2 the sample frequency are digitized and appear as low frequency (aliased) components in the digitized signal. Generally you want a filter to roll off the signal above the highest input frequency of interest to suppress noise above that frequency, which would otherwise add undesirable noise to the digitized signal.Īt a minimum you want an anti-alias filter to suppress the input above 1/2 the A/D sample frequency, even if there are signal components above that. ![]() There are two reasons to filter an A/D input: reduce noise above the input frequencies of interest, and anti-alias. ![]()
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