[Octave-bug-tracker] [bug #41958] signal package: fir2 function incorrect results for high-pass, band-pass, band-stop filters

[Mike Miller]

Update of bug #41958 (project octave):

                  Status:                    None => Confirmed              
                 Release:                   3.8.1 => other                  
        Operating System:               GNU/Linux => Any                    
                 Summary: octave-forge-signal fir1 function incorrect results
=> signal package: fir2 function incorrect results for high-pass, band-pass,
band-stop filters

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Follow-up Comment #1:

Confirmed, retitling to reflect the real problem is in fir2.

The fir1 function is a thin wrapper around the fir2 function, where most of
the work is done. The following example calls to fir2 demonstrate the errors
from the linked document:


b = fir2 (48, [0 0.7 0.7 1], [0 0 1 1]);
b = fir2 (48, [0 0.25 0.25 0.75 0.75 1], [0 0 1 1 0 0]);
b = fir2 (48, [0 0.45 0.45 0.55 0.55 1], [1 1 0 0 1 1]);


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