@AmpBenzScientist @fnord23 I want to find the bit in the source code that says it has to be below 100 Hz. And maybe I'll try to change it, to see what happens. No one bothered to explain why it was set to that value. Maybe it was a false assumption.
@thor @fnord23 Apicula got Gowin FPGAs working without closed source tools. The FPGAs might not perform as well as you would like but they are rated for industry and they are fairly inexpensive.
I've got a weird idea but it involves using the DSP abilities of a smartphone. The QCom Hexagon DSP can do a lot of work.
Tl;dr I have sadistic ideas.
@thor @fnord23 I was recently looking at NIR spectrometry and I found that the STM32F411 is a rather capable MCU when it comes to DSP. If it isn't strong enough for your uses then you can always use it to make a Black Magic Probe.