Minimum-Phase

A system is minimum-phase if the system and its inverse are causal and stable.

1. Poles and zeroes within the unit circle
2. Given $H(\omega )$, we are interested in the system that minimizes $|\angle H(\pi )-\angle H(0)|$
3. Causal and stable inverse system exists, and is also minimum phase.

A maximum-phase system has $|z_k|>1\forall k$