> Differential group delay does occur in one variety of digital
> filter - if I
> remember correectly, the FIR (Finite Impulse Response) design has
> differential
> group delay, while the IIR (Infinite Impulse Response) can be
> designed without
> differential group delay.
You have it backwards - FIR filters are phase linear, and have a fixed group
delay, whereas IIR filters do not. IIR filters mimic the operation of analog
filters (Butterworth, elliptical, etc.) but FIR filters are not realizable
in the analog world.
73,
Doug, K4DSP
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|