Return-Path: <owner-rsgb_lf_group@blacksheep.org> X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,PLING_QUERY,RATWARE_GECKO_BUILD,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id uA46XhaZ031070 for <sq5bpf@lipkowski.org>; Fri, 4 Nov 2016 07:33:44 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1c2Xxi-0000Dj-Gh for rs_out_1@blacksheep.org; Fri, 04 Nov 2016 06:26:50 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1c2Xxi-0000Da-7z for rsgb_lf_group@blacksheep.org; Fri, 04 Nov 2016 06:26:50 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from <vlf0403@abelian.org>) id 1c2Xxf-00032u-QB for rsgb_lf_group@blacksheep.org; Fri, 04 Nov 2016 06:26:49 +0000 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:To:Subject:Sender:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=CxoGy0EKDic2nMJCUlK7cpwdtTJpywSwnKOXWDpKZjg=; b=DKCNzjWk1ZBuFAd6BeBiDYqTsT +GBPxmZBWrGHXtIzuBQqsDqwsJOGCYiUjKW7gXOrSX7QsKHH5ppyMVJHSNJfewaokfqB29CsgxgvL 8IYxHNMvnVAViRNuDhgNJBjXhTElPYG4fG1Plil0iwqtsAacKD6baKi3AkSpVMw/B9Uw=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:33673 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from <vlf0403@abelian.org>) id 1c2Xxe-0002Oq-LE for rsgb_lf_group@blacksheep.org; Fri, 04 Nov 2016 06:26:46 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id E3E8740092B for <rsgb_lf_group@blacksheep.org>; Fri, 4 Nov 2016 06:26:45 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <581B3A1F.5060609@posteo.de> <e44cf075-7dd2-699b-6af3-656831b7c8df@df3lp.de> <581B83FC.6060600@posteo.de> <22185768CF114BE0A22668E235A933A2@gnat> <CAA8k23RhGh8TLE94eBGHntKP+fK6MPEPyEY7j_LmAh0xO+7j+Q@mail.gmail.com> From: Paul Nicholson <vlf0403@abelian.org> Message-ID: <581C2A25.9000203@abelian.org> Date: Fri, 4 Nov 2016 06:26:45 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <CAA8k23RhGh8TLE94eBGHntKP+fK6MPEPyEY7j_LmAh0xO+7j+Q@mail.gmail.com> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Scan-Signature: 7aa9ad08848e488e22e0ff1d71f4ef1d Subject: Re: LF: Smart noise cancelling?!? Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 9391 Andy wrote: > But surely, when narrowband filtering is in place - as any > narrow band mode will of necessity be doing internally - any > wideband non Gaussian or bursty noise when applied to this > narrow filter will eventually become Gaussian IN THAT BANDWIDTH Was about to chip in with the same point but you beat me. > A mathematician could probably prove that any random non Gaussian > signal if filtered sufficiently narrow in comparison to itsnature, > would end up Gaussian in the filtered bandwidth. I guess, a consequence of the central limit theorem. After all, the FFT is just a sum of lots of time domain samples. -- Paul Nicholson --