Zero-Phase Filter
Zero-Phase Filter : A filter, which causes no time shift (or time shift is corrected for) and no phase distortions of the signal. Usually, such filters have symmetrical impulse response and are therefore called two-sided or acausal filters. When applied to a very impulsive signal, the symmetry of the filter may lead to precursory ('acausal') oscillations, making it hard to identify the true onset (see Scherbaum, 2001, and Figure 7 in IS 11.4)
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