From sources-request at octave dot org Thu Sep 9 03:05:57 2004 Subject: Re: signal processing From: David Bateman To: robert quinto Cc: sources at octave dot org, help@octave.org Date: Thu, 9 Sep 2004 10:01:43 +0200 According to robert quinto (on 09/09/04): > Hi! > > I'm a newbie here, and I'm just staring to use Octave > for my school project on digital sugnal processing. > > Can I ask help from anyone about any source code or > important function in octave that could transfom > time-domain signals to frequency domain signals? > > Thanks! > > Booboy Errr, perhaps you should read a little about Fourier Transforms. So then the basic functions to look at are fft, etc.... If what you mean by frequency domain signals is more power spectral densities, then the function pwelch from octave-forge is what you need.. Explaining windowing, etc of dicrete fourier transforms and their effects on the accuracy of the result can't really be explained in such a short e-mail, so I won't go into why pwelch is better for a power spectral densities than a straight fft.. D. -- David Bateman David dot Bateman at motorola dot com Motorola CRM +33 1 69 35 48 04 (Ph) Parc Les Algorithmes, Commune de St Aubin +33 1 69 35 77 01 (Fax) 91193 Gif-Sur-Yvette FRANCE The information contained in this communication has been classified as: [x] General Business Information [ ] Motorola Internal Use Only [ ] Motorola Confidential Proprietary