SIRIUS
®
TECHNICAL REFERENCE MANUAL
Example
When sampling with 100 kHz measuring a signal with 10 Khz bandwidth. Sirius will still sample
the data with 1 MHz, analog LP filter will attenuate all signal frequencies above 400 kHz for at
least 60dB, making sure that below 100 kHz the data will be alias free. After that the digital filter
will give the wanted bandwidth and in the last stage the data, already alias free, will be
downsampled to 100 kHz.
Important
The FIR anti-aliasing filter was introduced in DEWESoft® X2 SP10. This filter has a very narrow,
user defined transition band and has zero phase distortion in the pass-band region.
In DEWESoft® X3 SP1 these anti-aliasing filters have been further updated, so that they are also
active, when the sampling rate is above 100 kHz (this wasn’t possible in the older versions of
DEWESoft®) and can be active, when we are using any of the IIR software filters.
Illustration below “ Enabling the AAF when IIR filters are used “ shows the new advanced setting, which
enables the anti-aliasing filters, when IIR filters are selected.
Enabling the AAF when IIR filters are used
SIRIUS
®
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