IIR filter specifications, including order, frequency cutoff, type, and possibly others.
FilterOfOrder(n, Wc, type, …)filter order
cutoff frequency
filter type, normally one of "low", "high", "stop", or "pass"
other filter description characteristics, possibly
including Rp for dB of pass band ripple or Rs for dB
of stop band ripple, depending on filter type (Chebyshev, etc.).
A list of class FilterOfOrder with the following elements
(repeats of the input arguments):
filter order
cutoff frequency
filter type, normally one of "low", "high", "stop", or "pass"
other filter description characteristics, possibly
including Rp for dB of pass band ripple or Rs for dB
of stop band ripple, depending on filter type (Chebyshev, etc.).
The filter is
Octave Forge http://octave.sf.net
filter, butter and buttord
cheby1 and cheb1ord, and
ellip and ellipord