Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!know!sdd.hp.com!hp-pcd!hplsla!bryanh
From: bryanh@hplsla.HP.COM (Bryan Hoog)
Newsgroups: comp.dsp
Subject: Re: Digital Filters
Message-ID: <9360014@hplsla.HP.COM>
Date: 17 Nov 90 03:15:59 GMT
References: <1990Nov15.121559.11290@watserv1.waterloo.edu>
Organization: HP Lake Stevens, WA
Lines: 14

>
>(3) Take the inverse DFT of this frequency response.  (For small enough
>M, the FFT isn't a big saving; just do the dumb DFT, using a real
>instead of a complex sinusoid, since you know the result will be real
>anyway.) Voila', the coefficients.
>

   In a college DSP class (YEARS ago!), we used this method, and, then
 (I think; this is where my memory gets hazy) we weighted the resulting
 coefficients with a Hamming window.  I remember the teacher saying
 something like "A Hamming window usually works best", but couldn't explain
 what was so "magic" about the Hamming window for FIR filter design.

   -Bryan