# Translations:Minimum-phase spectrum/25/en

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The *phase-lag jump* is defined as the total shift in phase lag over the Nyquist range; that is, the phase jump is . 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 . If the phase-lag jump of an (*N* + 1)-length causal wavelet is between the limits of 0 and , the wavelet is mixed phase. The terms *minimum-phase*, *mixed-phase*, and *maximum-phase wavelet *only apply to causal wavelets.