Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!rsiatl!larry
From: larry@rsiatl.UUCP (Larry Kahhan)
Newsgroups: comp.dsp
Subject: Re: Using system ID for FIR filter design?
Message-ID: <4730@rsiatl.UUCP>
Date: 10 Nov 90 14:25:17 GMT
References: <4973@tekfdi.FDI.TEK.COM> <9360013@hplsla.HP.COM>
Reply-To: larry@rsiatl.UUCP (Larry Kahhan)
Organization: Radiation Systems, Inc. (a thinktank, motorcycle, car and gun works facility)
Lines: 12

If you're looking to fit a complex frequency response curve to an arbitrary
transfer function, I've found that MathCAD works quite well. I've used
this technique for both "s" and "z" domain transfer functions with equal
success. The only proviso is that convergeance is heavily influence by the
choice of initial conditions, so sometimes a little manual "tweaking" of
initial conditions is required.

Another advantage of using MathCAD is that after a solution is found, the
transfer function response can be plotted against the original data set for a visual
clue as to goodness of fit.

Larry Kahhan - NRA, NRA-ILA, CSG, GSSA , & GOA