Return-Path: Received: (qmail 1023 invoked from network); 22 May 2000 19:45:26 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by bells.core.plus.net.uk with SMTP; 22 May 2000 19:45:26 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12ty2Z-0003dW-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 22 May 2000 20:39:03 +0100 Received: from smtp06.wxs.nl ([195.121.6.58]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12ty2Y-0003dR-00 for rsgb_lf_group@blacksheep.org; Mon, 22 May 2000 20:39:02 +0100 Received: from nl9222tvtref.nl ([195.121.216.95]) by smtp06.wxs.nl (Netscape Messaging Server 4.1) with ESMTP id FUZ7WX03.4OL for ; Mon, 22 May 2000 21:38:57 +0200 From: "Ko Versteeg" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 To: rsgb_lf_group@blacksheep.org Subject: LF: Binaural filtering / Morse Tones Date: Mon, 22 May 2000 21:38:03 +0200 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1155 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Message-ID: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi All Still experimental, but worth a try is a filter by G3PPT. Binster.zip (i quote) is An audio filter program for a PC equipped with a soundcard and uses the FFT (Fast FourierTransform) technique. The incoming audio is sampled at 8000Hz and subjected to a 2048 sample FFT. The unwanted frequency "bins" are set to zero and and inverse FFT carried out to reconstitute the original audio minus the unwanted bits. This has hitherto been difficult, probably due to the need for "windowing" of the data before the FFT to avoid spurious products with the result that one recreates "windowed" data. The program is available at: http://home.wanadoo.nl/nl9222/programs/binster.zip 73 de Ko, NL9222