Return-Path: Received: (qmail 4953 invoked from network); 12 Nov 2001 16:21:05 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 12 Nov 2001 16:21:05 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 1180 invoked from network); 12 Nov 2001 16:20:52 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 12 Nov 2001 16:20:52 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 163Jf2-0000Kn-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 12 Nov 2001 16:10:12 +0000 Received: from e31.co.us.ibm.com ([32.97.110.129] helo=e31.bld.us.ibm.com) by post.thorcom.com with esmtp (Exim 3.33 #2) id 163Jey-0000Ki-00 for rsgb_lf_group@blacksheep.org; Mon, 12 Nov 2001 16:10:08 +0000 Received: from westrelay01.boulder.ibm.com (westrelay01.boulder.ibm.com [9.99.140.22]) by e31.bld.us.ibm.com (8.9.3/8.9.3) with ESMTP id LAA41940 for ; Mon, 12 Nov 2001 11:06:47 -0500 Received: from usa.net (ss6.bld.socks.ibm.com [9.14.4.71]) by westrelay01.boulder.ibm.com (8.11.1m3/NCO v5.00) with ESMTP id fACG9LR149054 for ; Mon, 12 Nov 2001 09:09:21 -0700 Message-ID: <3BEFF401.3CF0E930@usa.net> Date: Mon, 12 Nov 2001 17:08:33 +0100 From: "Alberto di Bene" X-Mailer: Mozilla 4.78 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: Computer as DSP audio filter References: <005701c16b80$f8cf36c0$4d89153e@w8k3f0> Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Dick Rollema wrote:
Dear OM, I have been told there exists a computer program that not only presents received signals as a waterfall display but can also make one of the signals being heard as audio via the computer speakers.In that way the computer can act as a DSP audio filter, perhaps even for normal speed CW provided an appropriate bandwidth is selected.Anyone know more about this program? 73, Dick, PA0SE


Dick,
   if you go to http://www.weaksignals.com you can find, besides Argo, also Spectran,
which does what you ask for. It has a FIR bandpass filter with selectable edges, and
an IIR peaking filter, whose center frequency is adjustable. It has also an LMS denoiser
function, quite effective with CW, a bit less with SSB.

Any usage report is welcome.

73  Alberto  I2PHD