Return-Path: Received: from mtain-dc11.r1000.mx.aol.com (mtain-dc11.r1000.mx.aol.com [172.29.64.139]) by air-df06.mail.aol.com (v129.4) with ESMTP id MAILINDF063-5ef84bf7b1a6355; Sat, 22 May 2010 06:27:50 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dc11.r1000.mx.aol.com (Internet Inbound) with ESMTP id B27E03800008D; Sat, 22 May 2010 06:27:48 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OFluk-0007Ky-8n for rs_out_1@blacksheep.org; Sat, 22 May 2010 11:26:42 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OFluj-0007Kp-Q0 for rsgb_lf_group@blacksheep.org; Sat, 22 May 2010 11:26:41 +0100 Received: from mout2.freenet.de ([195.4.92.92]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OFlui-00053B-Ih for rsgb_lf_group@blacksheep.org; Sat, 22 May 2010 11:26:41 +0100 Received: from [195.4.92.15] (helo=5.mx.freenet.de) by mout2.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.72 #3) id 1OFluh-0008W1-98 for rsgb_lf_group@blacksheep.org; Sat, 22 May 2010 12:26:39 +0200 Received: from blfd-4db198f3.pool.mediaways.net ([77.177.152.243]:1195 helo=[192.168.0.21]) by 5.mx.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.72 #3) id 1OFlug-0007lH-Rp for rsgb_lf_group@blacksheep.org; Sat, 22 May 2010 12:26:39 +0200 Message-ID: <4BF7B15D.2020002@freenet.de> Date: Sat, 22 May 2010 12:26:37 +0200 From: =?ISO-8859-1?Q?Wolfgang_B=FCscher?= User-Agent: Thunderbird 2.0.0.24 (Windows/20100228) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <008f01caf784$779a11d0$0301a8c0@your91hoehfy9g> <4BF4FBF4.2020208@iup.uni-heidelberg.de> <4BF53399.4010403@iup.uni-heidelberg.de> <1C7BCD9DEB29472F9BB467C4EE390840@JimPC> <4BF7051B.7010309@iup.uni-heidelberg.de> <4BF7A507.9050202@legal-medicine.de> In-Reply-To: <4BF7A507.9050202@legal-medicine.de> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: Clipping or blanking/9kHz intermods Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: G x-aol-sid: 3039ac1d408b4bf7b1a47468 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Peter, you wrote: > Interesting that "clipper" function. What algorithm are you using and at > which "average" time/frequency window(s)? > > There are two algorithms, a hard limiter (simple clipper) and a noiseblanker. Fot the clipper, the average (of the signal power) uses a simple lowpass filter with a time constant of a few seconds. I uloaded the algorithms as C / C++ sourcecodes, with a few toughts from Markus DF6NM and myself in the comment fields - this may actually be more interesting than the implementation itself (in the module noiseblanker.cpp). The zipped sourcecode archive is here: http://www.qsl.net/dl4yhf/speclab/noiseblanker_and_clipper_algo.zip All the best, 73, Wolf .