From help-request at octave dot org Fri Apr 7 21:11:17 2006 Subject: Re: impulse invariance From: Doug Stewart To: Ronald Crummett CC: help at octave dot org Date: Fri, 07 Apr 2006 21:08:33 -0500 Ronald Crummett wrote: >Hi - > >Does anyone know of an impulse invariance function for Octave, similar >to impinvar in Matlab? I've been trying to write one but if someone has >already done so, or has any pointers, that would be sweet. > >-Ron > > > Did you look at C2D It has a matched pole zero option. As I understand it the impinvariant filter is almost the same as the Matched pole zero filter. The matched pole zero has some added zeroes to make the number of zeroes equal the number of poles. These extra zeros at placed at -1 in the Zed plane. You could start with C2D and add impulse invariant to it. If you want help or can't do it I will do it for you and the group. Doug Stewart ------------------------------------------------------------- Octave is freely available under the terms of the GNU GPL. Octave's home on the web: http://www.octave.org How to fund new projects: http://www.octave.org/funding.html Subscription information: http://www.octave.org/archive.html -------------------------------------------------------------