🚀 go-pugleaf

In article <1992Oct2.203621.5649@tamsun.tamu.edu>, mchung@ee.tamu.edu
(Maranatha Chung) writes:
|> Why is an odd order FIR filter better than an even order FIR filter?
Given impulse response is symmetric about its center, the group delay
is
(filter length - 1)/2.  For an odd length filter, the group delay would
be an integer.  For an even length filter, the group delay would be
fractional.

Some applications in image processing need to know where to chop off the
convolution header and tail so as to preserve pixel dimensions.  Linear
phase and an integer group delay make it easy to truncate the larger,
convolved image.