SIRIUS
®
TECHNICAL REFERENCE MANUAL
Analog filter, oversampling and digital filter
You can see that the analog filter does not have a very sharp damping – but this is not required. The
important thing is, that the attenuation of the analog low-pass filter increases for higher frequencies.
Analog filtered: The troublesome part of the input signal (red dashed line) is already highly damped
before we even sample it! Also some other parts of the input signal are damped – but those parts are
way higher than the frequency range that we are interested in f
f
: so this is also not a problem.
Sampled Signal: the sampled signal shows the same folding effect as before, but this time the aliased
frequencies have only very little amplitude (because of the analog filter).
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