NI 5441 FIR Filter Type: Flat

NI Signal Generator

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.

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.

Flat Filter Response with a Passband of 0.4