[PD] help with making a parametric EQ

hard off hard.off at gmail.com
Thu May 1 16:44:04 CEST 2008

from this site, in the section titled 'group delay'


i got an equation to calculate the 'group delay' of a linear FIR filter.

the equation is:

group delay = phase shift / -2pi

where phase shift is a value of radians / hz

can anyone please tell me how to calculate the phase shift with a basic FIR
filter in pd?

i'm hoping that if i can get that, then i can add/subtract the filtered
signal to a slightly delayed original signal to make a reasonable parametric

(oh, and sorry if this mail gets sent to the list twice - i forgot to add
the [pd] bit to the subject first time)
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