# Dictionary:Linear-phase filter

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{{#category_index:L|linear-phase filter}}
A mixed-phase filter that time-shifts frequency components proportional to their frequency, thus introducing a constant delay but no change of waveshape. The phase-shift versus frequency graph is linear over the band-pass and has an intercept that is a multiple of 2π. Also called a **delay filter**. If the intercept is an odd multiple of π it will invert the wavelet. See Figure P-1 and *phase characteristics*.