Update: I mentioned that I have been unable to find a replacement for the Iowa Hills FIlter software. Since creating this video I was able to solve that problem. See here https://www.youtube.com/watch?v=BUGQaTJ6aWI&t=166s In this video I will be playing around with some of the audio processing capabilities of the arduino-audio-tools toolkit using an ESP32. It does assume you have the ESP32 set up in Arduino. If not go here: https://docs.espressif.com/projects/arduino-esp32/en/latest/getting_started.html Here's the Audio Library https://github.com/pschatzmann/arduino-audio-tools Here's my modified examples including a doc that shows the pin connections to the pMod https://github.com/thaaraak/ESP32-Arduino-Audio Here's the pMod I2S2 Codec (no affliliation) https://digilent.com/reference/pmod/pmodi2s2/start Here's the eariler video I did on deriving the coefficients https://www.youtube.com/watch?v=DTO9gGOFIFY&t=782s The IOWA hills walkthrough starts at around 9:30. Note that it looks like that site has gone offline and I haven't found a replacement yet. The python firwin library from scipy.signal can do the coeffs for low/high/bandpass - but I haven't figured out the Hilbert Here's the ESP32 I was using (no affiliation) https://www.amazon.com/gp/product/B0718T232Z/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 0:00 Intro 1:30 Hardware setup and connections 3:30 I2S Pin configuration detail 5:10 Sine wave generator to I2S - code 6:59 Sine wave generator to I2S - in action 8:05 I2S input Stream to I2S output Stream - code 9:22 I2S input Stream to I2S output Stream - in action 11:45 FIR Filter (90 degree phase) - code 13:29 FIR Filter (90 degree phase) - in action 14:58 FIR Filter (low pass/high pass) - code (with a quick note on the coefficient derivation) 16:16 FIR Filter (low pass/high pass) - in action 17:54 Wrap up ... https://www.youtube.com/watch?v=D0EUDRo4Mx0

In this video I complete the path from AD8307 through LF398 and into the PIC uController. ... https://www.youtube.com/watch?v=qv4gBxY9Itk