The app shows a list of IIR filters with system structure and its step response. Among them are:
- P system
- PI system
- PD system
- PID system
- PT1 system
- PT2 system
- D system
- IT1 system
- DT1 system
- PDT1 system
- PIDT2 system
This app is supplemented by other apps such as IIR Filter Design and IIR FilterTest, which were deliberately outsourced to the V model.
All three apps together enable any developer to easily design and test any second-order filter. Higher order filters can easily be cascaded, allowing for more complex models and system transfer functions.
If you want to know how to design an IIR filter, here is the solution