[Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has round-off errors

[Mike Miller]

Follow-up Comment #6, bug #53855 (project octave):

Those are questions for the help mailing list, not the bug tracker.

The freqz function in Octave does not yet support a filter specified by sos
(second-order sections), and the fvtool is not yet implemented either. The
only way to visualize the filter frequency response at the moment is with
freqz, which only supports transfer function format. A wish list bug
requesting support for second-order sections in the freqz function would be
appropriate.

The filter function only supports transfer function format, you would use the
sosfilt function to apply a second-order section filter to your 'typenoise'
signal.

This bug remains with the question: is any description needed in the butter
(and cheby1, cheby2, ellip) doc string to mention this problem?

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