Octave IIR Filter Design Tool

This is a fork of https://gitlab.com/amazing-geese/octave-iir-filter-design-tool

To Run

Simply run the gui.m file in octave everything is handeled within the GUI

Filter Types

Here is a list of filter types this calculator can generate with what parameters are used. Note: Options do not show/hide based on filter type selection. Use the chart below to determin which parameters are used.

Filter Type	Sampling Frequency (Fs)	Center Frequenecy (Fc)	Q Factor	Slope	Gain
One Pole Lowpass	Yes	Yes	No	No	No
One Pole High Pass	Yes	Yes	No	No	No
LowPass 1p1z	Yes	Yes	No	No	No
High Pass 1p1z	Yes	Yes	No	No	No
Low Pass	Yes	Yes	Yes	No	No
High Pass	Yes	Yes	Yes	No	No
BandPass	Yes	Yes	Yes	No	No
Notch	Yes	Yes	Yes	No	No
Peak	Yes	Yes	Yes	No	Yes
Low Shelf	Yes	Yes	No	Yes	Yes
High Shelf	Yes	Yes	No	Yes	Yes
Low Shelf 1st	Yes	Yes	No	No	Yes
High Shelf 1st	Yes	Yes	No	No	Yes
All Pass	Yes	Yes	Yes	No	No
All Pass 1st	Yes	Yes	No	No	No

Known Bugs

• Coursors don't disappear from previous plot after replotting new filter.

Credits

• Original programming by EGN Goose
• Calculations for filters other than lowshelf and high shelf were obtained from https://www.earlevel.com/main/2021/09/02/biquad-calculator-v3/
• Low shelf and high shelf equations obtained from https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.html
• datacursor code created by Pantxo Diribarne see datacursor.m file.