# Translations:Dictionary:Phase characteristics/1/en

{{#category_index:P|phase characteristics}}

**1**. Of the set of all those wavelets, filters, or systems that have the same amplitude spectrum or autocorrelation, particular members can be characterized by their phase spectra (phase as a function of frequency). (They can also be characterized in other ways, for example by the location of their roots in the *z*-domain; see Figure P-2.) The principal feature of **minimum phase** is that the energy arrives as early as possible. The phase of a minimum-phase wavelet is smaller and its energy builds up faster (i.e., it is **minimum delay**) than for any other causal wavelet with the same amplitude spectrum (or same autocorrelation). A two-term wavelet (or **doublet**) [*a,b*] is minimum phase (minimum delay) if |*a*|>|*b*|.