I'm looking at building a cost-effective active noise control system.
Basically, the system comprises two microphones - one reference and one error. A DSP unit samples and phase flips the reference microphone and plays the flipped signal against the input for destructive interference.
The error microphone then feeds-forward the resulting signal, which should be 0 (but is never quite). How might one develop a proportional control algorithm for the DSP unit to adapt the reverse signal from the error?