Translations:Minimum-phase spectrum/25/en

The phase-lag jump is defined as the total shift in phase lag over the Nyquist range; that is, the phase jump is $\phi (\pi )-\phi (-\pi )$. A causal wavelet is a minimum-phase-lag wavelet (which simply is called minimum-phase) if and only if its phase-lag jump is zero. An (N + 1)-length causal wavelet is maximum phase if and only if its phase-lag jump is $2N\pi$. If the phase-lag jump of an (N + 1)-length causal wavelet is between the limits of 0 and $2N\pi$, the wavelet is mixed phase. The terms minimum-phase, mixed-phase, and maximum-phase wavelet only apply to causal wavelets.