10 samples
α = 0.50
Creates periodic peaks or notches - the basis of flanging and chorus
Flanging Effect: Varying the delay creates the classic "jet plane" sweeping sound.
Chorus Effect: Multiple slightly-detuned copies of a signal create a richer, ensemble-like sound.
Room Acoustics: Comb filtering occurs naturally when direct and reflected sounds combine.
Feedforward (FIR): y[n] = x[n] + α·x[n-D] - Creates notches (zeros)
Feedback (IIR): y[n] = x[n] + α·y[n-D] - Creates peaks (poles) - can be unstable if |α| ≥ 1