The goal is to take in sound data via microphones and play audio via speakers to eliminate that sound data. This goal is handled in two steps. 1. With an electret condenser microphone on the outside of the  headphones, audio data is brought in and inverted via op amps to hopefully cancel the noise in real time. 2. There are feedback microphones inside the headphones which take in audio data and compare it to the desired sound. This difference is then passed to an ESP32 which computes and NLMS filter to apply to the feed forward microphones via an I2C DAC.