A simple digital low-pass filter in C | Kirit Chatterjee
Figure 1 from A 1V–1.75μW Gm-C low pass filter for bio-sensing applications | Semantic Scholar
Using Butterworth Filter C++ Class to Implement a Band-Pass Filter, Low Pass Filter & High Pass Filter in C - Contract Engineering, Product Design & Development Company - Cardinal Peak
Low Pass Filters
Is the typical implementation of low pass filter in C code actually not a typical low pass filter? - Signal Processing Stack Exchange