Back in the 1980s one of my first tasks, as a junior engineer, was to write a very simple filter design program, in GWBasic!
In the 1990s I updated it to Borland C and added some new functionality.
In the 2000s I added a GUI front end and more functionality.
For the last 20 years this has done myself and my customers well and has been my goto filter design tool but has languished in recent times so I've finally found the time to open-source it and it's now part of the SigLib DSP library.
Over the last few months, at the request of customers, I've also added commercial grade audio Automatic Gain Control and multi-dimensional Kalman Filters to the library.
https://github.com/Numerix-DSP/siglib
Enjoy :-)
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