Return-Path: Received: from rly-db07.mx.aol.com (rly-db07.mail.aol.com [172.19.130.82]) by air-db08.mail.aol.com (v121.4) with ESMTP id MAILINDB084-ad647d27e30364; Sat, 08 Mar 2008 06:53:42 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db07.mx.aol.com (v121.4) with ESMTP id MAILRELAYINDB074-ad647d27e30364; Sat, 08 Mar 2008 06:53:22 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JXxby-00071z-Vc for rs_out_1@blacksheep.org; Sat, 08 Mar 2008 11:53:10 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JXxby-00071q-Je for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2008 11:53:10 +0000 Received: from imo-d22.mx.aol.com ([205.188.144.208]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JXxbv-0002zA-1b for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2008 11:53:10 +0000 Received: from MarkusVester@aol.com by imo-d22.mx.aol.com (mail_out_v38_r9.3.) id l.d39.2276f127 (34982) for ; Sat, 8 Mar 2008 06:52:54 -0500 (EST) Received: from Amilo3205 (e179220229.adsl.alicedsl.de [85.179.220.229]) by cia-da08.mx.aol.com (v121.4) with ESMTP id MAILCIADA087-88a647d27e14de; Sat, 08 Mar 2008 06:52:53 -0500 Message-ID: From: "Markus Vester" To: References: <000901c87ef9$2cd34960$08a3fea9@edgar1ew1re1zt> <47D1150A.6090407@ukonline.co.uk> <000701c88045$c681e740$0301a8c0@g3kev> In-Reply-To: Date: Sat, 8 Mar 2008 12:52:48 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 X-Spam-Flag: NO X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: SMPS noise cancelling software Content-Type: multipart/mixed; boundary="----=_NextPart_000_0029_01C8811B.50282F10" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : + ------=_NextPart_000_0029_01C8811B.50282F10 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Thanks to Wolf for your encouraging comments, and your work towards extending the audio streaming utility to USB receivers. I have been running the SMPS noise canceller in front of the colour-DF grabber last night, and it seems to have pretty much killed two of my nastiest noise sources. To faciliate testing, here is a slightly different Windows-XP startup script. It offers a wider passband centered around 1.5 kHz, and also creates the designated ..\dats subdirectory for the audio streams. After the sound utilities and the main program have started, you should be able to hear cleaned-up audio from the soudcard. You can judge the effect by pressing "b" to toggle bypass mode, or press "q" to quit. Any feedback is highly appreciated. Best wishes Markus ----- Original Message ----- From: "Markus Vester" To: Sent: Friday, March 07, 2008 1:51 PM Subject: LF: SMPS noise cancelling software > Dear LF, > > as our LF and MF receiving is often plaguesd by intense hash from various switch mode power supplies, I have tried to work towards > a software noise canceller, using estimation and subtraction. A short description of the technique, along with free experimental > software and sourcecode, can be found on http://members.aol.com/df6nm2/smps_nc/NC3F4.zip (63 kB). Hope you may find it useful... > > Kind regards > Markus, DF6NM > > > ------=_NextPart_000_0029_01C8811B.50282F10--