#### Zero PhaseSignals

A zero-phase signal is thus a linear-phase signal for which the phase-slope is zero. As mentioned above (in §7.4.3), it would be more precise to say 0-or--phase signal'' instead of zero-phase signal''. Another better term is zero-centered signal'', since every real (even) spectrum corresponds to an even (real) signal. Of course, a zero-centered symmetric signal is simply an even signal, by definition. Thus, a zero-phase signal'' is more precisely termed an even signal''.

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Linear Phase Signals