NI 5441
FIR Filter Type: Flat
Passband Values : 0.1 to 0.4
This low-pass filter is designed to give a flat response until the passband value. The passband value is a fraction of the IQ Rate coming into the FIR filter. Use the Flat Filter Passband property or the NIFGEN_ATTR_OSP_FIR_FILTER_FLAT_PASSBAND attribute to set the passband value.
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Caution The Flat filter stopband does not begin until 0.6 × IQ Rate. If you provide data that has frequency content above 0.4 × IQ Rate, then aliasing occurs in the output spectrum. It is recommended to keep all frequency content below 0.4 × IQ Rate when using the Flat filter. |
The following diagram shows the Flat Filter response with a passband of 0.4. The frequency axis is scaled as a fraction of the IQ Rate.
