I'm not sure if this is the one in question, but here's a pretty decent free DSP book... http://www.dspguide.com/ -Dal ----- Original Message ----- From: Fulvio Portalupi > the file you're referring to would also interest me. Could you please send > me it ? > ----- Original Message ----- > From: D Lloyd > To: > > stuck in. What I did find was a 3MB PDF file relating to signal processing > > + matlab which I found quite useful. I cannot remember the link so, if you > > want it and your email account can handle the size, I can email it > directly -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.