SIRIUS
®
TECHNICAL REFERENCE MANUAL
6.1.6.4. FIR filter characteristics
A low-pass filter is defined by 5 characteristics (see illustration below “ FIR filter specifications ”):
passband ripple, stopband ripple, cutoff frequency, pass band frequency and stop band frequency. In
DEWESoft® we are able to manipulate 3 of these characteristics. With the divided sample rate we select
the cutoff frequency which is equal to half of the channel sample rate.
FIR filter specifications
The other characteristic that we can set is the transition width. This value is by default set to 16 %. This
means that the stop band and pass band frequencies (fp and fs respectively) are equal to ±16 % of the
cutoff frequency (fp = 34 % fc, fs = 66 % fc). Transition width is defined in the advanced hardware
settings under digital filters (see illustration below “ Digital filters, AAF (zero-phase distortion) transition
width ”).
Important
Smaller transition width requires more processing power!
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