GNU DSP Filter library?

[Brian Gough]

Frederick (Rick) A Niles writes:
 > Suggestion: GSL should include functions to implement functions of 
 > standard DSP filtering such as Butterworth, Chebyshev, and elliptic 
 > filters.

Sounds reasonable, just a question of finding someone to volunteer to
(or pay someone to) write it.

 > Is there already another GNU library to do this?

I don't know of any myself, try the GNU Free Software Directory

  http://www.gnu.org/directory/

for a definitive list -- there is something called IT++ which looks
related.

regards,
-- 
Brian Gough