Return-Path: Received: from mtain-dd02.r1000.mx.aol.com (mtain-dd02.r1000.mx.aol.com [172.29.64.142]) by air-dd04.mail.aol.com (v129.4) with ESMTP id MAILINDD041-860a4c89561118e; Thu, 09 Sep 2010 17:48:01 -0400 Received: from post.thorcom.com (unknown [195.171.43.25]) by mtain-dd02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0D85F380000A4; Thu, 9 Sep 2010 17:47:59 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OtmSc-0001S5-QD for rs_out_1@blacksheep.org; Thu, 09 Sep 2010 20:07:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OtmSS-0001Rw-Gr for rsgb_lf_group@blacksheep.org; Thu, 09 Sep 2010 20:06:52 +0100 Received: from smtp-out21.han.skanova.net ([195.67.226.208]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OtmSQ-0001iL-7X for rsgb_lf_group@blacksheep.org; Thu, 09 Sep 2010 20:06:52 +0100 Received: from [127.0.0.1] (81.235.167.68) by smtp-out21.han.skanova.net (8.5.124.10) (authenticated as u33233109) id 4C7E1065003842B8 for rsgb_lf_group@blacksheep.org; Thu, 9 Sep 2010 21:06:43 +0200 Message-ID: <4C893046.1050907@telia.com> Date: Thu, 09 Sep 2010 21:06:46 +0200 From: "Johan H. Bodin" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; sv-SE; rv:1.9.2.9) Gecko/20100825 Thunderbird/3.1.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4C872B44.4030706@telus.net> <1283930050.6221.41.camel@vaio3rd> <4C879ED3.8030402@usa.net> <1283986494.6287.9.camel@vaio3rd> <4C88EED4.4050107@usa.net> <4C890D37.4070608@iup.uni-heidelberg.de> <4C891308.8090002@usa.net> In-Reply-To: <4C891308.8090002@usa.net> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Request for modification of Argo Time base Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: S X-AOL-REROUTE: YES x-aol-sid: 3039ac1d408e4c89560f466d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Alberto, why not mix the wanted spectrum slice down to DC (I/Q) and then decimate the signal down to a very low FS and compute a no-so-giant complex-input FFT? Is there any advantage of making a huge FFT when you don't need more bins than the number of vertical pixels? 73 Johan SM6LKM ---- Alberto di Bene wrote 2010-09-09 19:02: > you are asking for an FFT of giant length... :-) I will consider you > request to see what would imply to implement it.