From help-octave-request at bevo dot che dot wisc dot edu Fri Jan  9 15:53:18 2004
Subject: Frequencies in fir1, etc.
From: Joe Koski <jkoski11 at comcast dot net>
To: Octave_post <help-octave at bevo dot che dot wisc dot edu>
Date: Fri, 09 Jan 2004 14:52:55 -0700

For those of us who took our digital signal processing class 20+ years ago,
is there a simple way to relate w in the call b = fir1(n,w) to an actual
cutoff frequency (omega sub c or f sub c) based on parameters like point
spacing (T), n, pi, etc.? Apparently w is between 0 and 1 (at least for a
low or high pass filter). The conversion must be so trivial that it isn't
needed, but for me, at least, this conversion would be a useful addition to
the help files. My 1975 edition of Oppenheim and Schafer isn't too clear on
this conversion either. Thanks.

Joe Koski




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