SIRIUS
®
TECHNICAL REFERENCE MANUAL
6.1.3.1. Filter order
An ideal filter has full transmission in the pass band, complete attenuation in the stop band, and an
abrupt transition between the two bands. In practice an ideal filter is not possible and can only be
approached to a certain degree. The higher the filter order, the more the filter will approach the ideal
filter; but this also means that the impulse response will be longer and that the latency will increase. In
the illustration below “Filter order” you can see three analog filters (2nd, 4th and 8th order) and the
SIRIUS® filter (which is a combination of analog filter, oversampling and digital filter). Note, that filters
with higher order have a sharper damping around the filter frequency:
Filter order
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V20-1 268 / 336
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