Is there a FHT library out there for non-AVR chips?

I'm familiar with the openmusic work, but it is strictly for AVR chips.

Q: Has anyone been able to write a function, or even a whole library, for FHT treatment of DHT?

I'm working with ESP8266 & ESP32 for raw speed.

I would assume so... Wikipedia links to an article written by Ralph Hartley in 1942 so it wasn't something created for the Arduino. :wink:

(For digitized signals it would have to be DHT which came later, but it was way-way before the Arduino.)

Q: Has anyone been able to write a function, or even a whole library, for FHT treatment of DHT?

Ancient history. Google "fht c/c++" for 11,600 hits.