#### Zero Phase Signals

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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Application of the Shift Theorem to FFT Windows

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Linear Phase Signals