Hi Paul, 

No problem.  I'm happy to have my "old" Octave toolbox included. 

Regards, 

- Christophe

-----Original Message-----
From: Paul Brossier [mailto:[email protected]] 
Sent: Wednesday, September 30, 2009 3:23 AM
To: Søren Hauberg; Christophe Couvreur
Cc: [email protected]; Thomas Weber
Subject: Re: [OctDev] [Pkg-octave-devel] Bug#548843: octave-signal: please 
include adsgn.m, cdsgn.m & co

-----BEGIN PGP SIGNED MESSAGE-----
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Hello Søren and all,

Søren Hauberg wrote:
> tir, 29 09 2009 kl. 20:25 +0200, skrev Paul Brossier:
>> Would it be possible to include in the octave-signal package the 
>> 'octave' toolbox of Christophe Couvreur, available under a BSD license:
>>
>>    http://www.mathworks.com/matlabcentral/fileexchange/69
> 
> I don't have any objections about including this code, but I would 
> appreciate comments from users of the 'signal' package.
> 
> I do have one question though: have you asked Christophe about this? I 
> know the BSD license gives us permission to include his code, but I 
> think it would be polite ask him first.
> 

I didn't and indeed should have. Christophe's email, as found on mathworks.com 
is included in this message.

Christophe, would you agree on including your 'octave' toolbox in the 
octave-signal package? The package is available here:
  http://octave.sourceforge.net/signal/index.html

One note about using this code in octave: given that the  bilinear function in 
the octave-signal package "differs from the bilinear function in the signal 
processing toolbox, which uses 1/T rather than T", the call to bilinear in 
cdsgn.m and adsgn.m should be updated
accordingly:

% Use the bilinear transformation to get the digital filter.
[B,A] = bilinear(NUMs,DENs,1/Fs);

Also, the page at http://wiki.octave.org/wiki.pl?CategorySpeech could be 
updated as follow:

 - Christophe Couvreur's octave
(http://www.mathworks.com/matlabcentral/fileexchange/69) has C-weighting, 
A-weighting, octave and one-third-octave filter design functions, as well as 
plotting functions to compare filter characteristics to specifications.

Thanks, Paul
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