Frequencies in fir1, etc.

[Joe Koski]

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




-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
-------------------------------------------------------------