Return-Path: Received: (qmail 19931 invoked from network); 25 Feb 2005 04:57:58 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore04.plus.net with SMTP; 25 Feb 2005 04:57:58 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1D4XZB-0001aA-JX for dave@picks.force9.co.uk; Fri, 25 Feb 2005 04:59:06 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1D4XZB-0001a6-6X for dave@picks.force9.co.uk; Fri, 25 Feb 2005 04:59:05 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1D4XZa-0007aX-E7 for dave@picks.force9.co.uk; Fri, 25 Feb 2005 04:59:30 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1D4XUe-0001sj-Qc for rs_out_1@blacksheep.org; Fri, 25 Feb 2005 04:54:24 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1D4XUc-0001rC-KD for rsgb_lf_group@blacksheep.org; Fri, 25 Feb 2005 04:54:22 +0000 Received: from relay.sotline.ru ([80.89.139.226]) by relay.thorcom.net with esmtp (Exim 4.43) id 1D4XUZ-0007PS-Ih for rsgb_lf_group@blacksheep.org; Fri, 25 Feb 2005 04:54:22 +0000 Received: from astral.omskcity.com (mxs.sotline.ru [80.89.139.227]) by relay.sotline.ru (8.x.x) with ESMTP id j1P4sB5r023787 for ; Fri, 25 Feb 2005 10:54:11 +0600 (OMST) (envelope-from fitec@omskcity.com) Received: from noname.nodomain.nowhere (host198.m02.dial.sotline.ru [81.176.51.198]) by astral.omskcity.com (8.x.x) with ESMTP id j1P4s8WV005016 for ; Fri, 25 Feb 2005 10:54:09 +0600 (OS) Received: from localhost (fitec@localhost) by noname.nodomain.nowhere (8.8.5/8.8.5) with SMTP id LAA00252 for ; Fri, 25 Feb 2005 11:13:00 GMT X-Authentication-Warning: noname.nodomain.nowhere: fitec owned process doing -bs Date: Fri, 25 Feb 2005 11:13:00 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org In-Reply-To: <421E3055.90404@usa.net> Message-ID: MIME-Version: 1.0 X-SPF-Result: relay.thorcom.net: domain of omskcity.com designates 80.89.139.226 as permitted sender X-Spam-Score: 1.3 (+) X-Spam-Report: autolearn=no,DATE_IN_FUTURE_06_12=1.202,FORGED_RCVD_HELO=0.05 Subject: Re: LF: Re: How many bits ? (was :Off Topic Ft101zd) Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.9 required=5.0 tests=DATE_IN_FUTURE_06_12 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit On Thu, 24 Feb 2005, Alberto di Bene wrote: > But what you are saying is that I can put two pure sine signals at e.g. > 1 MHz, one of them > of 1V amplitude, and the other of 1uV amplitude, separated by, let's > say, 1 kHz, digitize them with > a 16-bit, 100 MHz ADC and then, by simply decimating (low pass + > subsampling) and applying a > post-decimation filter, I can resolve them ? Why not if ADC overload treshold is more then 1V? Certanly noise dithering assumed. If sigs are 'pure' sin then You can use generaly as narrow bandwidth digital filter as You need. Then noise dithering an quantisation noise deposit to out sig can be as small as is needed. If CPU is powerfull enough of cose. May be I am not right but why, where mistake is? 73 de RA9MB/Alex http://www.qsl.net/ra9mb