[Kst] [Bug 87446] New: Butterworth filters are miss-named.

[netterfield at astro.utoronto.ca]

------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
      
http://bugs.kde.org/show_bug.cgi?id=87446      
           Summary: Butterworth filters are miss-named.
           Product: kst
           Version: unspecified
          Platform: unspecified
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kst kde org
        ReportedBy: netterfield astro utoronto ca


Version:           0.99-devel (using KDE 3.2 BRANCH >= 20040204, Mandrake Linux Cooker i586 - Cooker)
Compiler:          gcc version 3.3.2 (Mandrake Linux 10.0 3.3.2-6mdk)
OS:                Linux (i686) release 2.6.3-7mdk

The pass filter plugins are labeled as butterworth filters but they are not.

Butterworth filters are causal, and have a complicated phase vs freq relationship...  See for example http://www-users.cs.york.ac.uk/~fisher/mkfilter/trad.html


The filter used is generally better than a butterworth (being 0 phase and acausal) but the name should be changed.

Perhaps just drop 'buttworth' from the short names, and add '0 phase butterworth' to the description.