SSB filter/ testing Digital Signal Processing on STM32f106 "Blue Pill"

Giuseppe Callipo IK8YFW tailored software for digital filtering audio using this tiny ARM Cortex processor board. I've built and tested it. Sounds very effective. More info below: https://www.thingiverse.com/thing:2911762?fbclid=IwAR2QC5n2TBDV6uMfi6KJAib9aJ7E54ZX6BuTuWK73KJJA_KZ0IFExf4kyTE