[PD] help with making a parametric EQ

[hard off]

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

http://www.dspguru.com/info/terms/filtterm/index2.htm


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
EQ.



(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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