When is the FIR preferred over the Digital Filter Box?
Written by Paul Cracknell
Updated at February 5th, 2021
-
Moku:Go
Moku:Go Arbitrary Waveform Generator Moku:Go Data Logger Moku:Go Frequency Response Analyzer Moku:Go Logic Analyzer & Pattern Generator Moku:Go Oscilloscope & Voltmeter Moku:Go PID Controller Moku:Go Spectrum Analyzer Moku:Go Waveform Generator Moku:Go Power Supplies Moku:Go Digital Filter Box Moku:Go FIR Filter Builder Moku:Go Lock-in Amplifier
- Moku:Lab
- Moku:Pro
- Python API examples
For many applications, the FIR and digital filter (IIR) can be used interchangeably. However, they do have a few key differences:
- FIR filters have a linear phase response. They create minimal signal distortions in the time domain.
- IIR filters are computationally inexpensive compared to FIR filters. The propagation delay is typically shorter.
- FIR filters can easily create very steep cut-off corners, where the slopes of IIR filters are less tunable.
- IIR filters have analog counterparts. You can use the IIR filter to simulate analog filters or the other way around. FIR filter can only be implemented digitally.