Return-Path: Received: (qmail 15026 invoked from network); 14 Jan 2002 22:58:05 -0000 Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 14 Jan 2002 22:58:05 -0000 Received: (qmail 1368 invoked from network); 14 Jan 2002 22:58:07 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 14 Jan 2002 22:58:07 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16QG05-0001S5-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 14 Jan 2002 22:54:45 +0000 Received: from fep04.swip.net ([130.244.199.132] helo=fep04-svc.swip.net) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16QG04-0001S0-00 for rsgb_lf_group@blacksheep.org; Mon, 14 Jan 2002 22:54:44 +0000 Received: from oemcomputer ([212.151.13.242]) by fep04-svc.swip.net with SMTP id <20020114225355.CHJW21176.fep04-svc.swip.net@oemcomputer> for ; Mon, 14 Jan 2002 23:53:55 +0100 Message-ID: <009301c19d4e$6913cdc0$8d0a97d4@oemcomputer> From: "Johan Bodin" To: rsgb_lf_group@blacksheep.org References: <3C4301BD.878E49BF@usa.net> <002901c19d3d$c00e19c0$8d0a97d4@oemcomputer> <3C4351B6.DFA64704@usa.net> Subject: LF: Re: Re: Introducing Jason - and asking for cooperation Date: Mon, 14 Jan 2002 23:54:19 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Alberto di Bene wrote: [.....] > an audio frequency. This is not of course the case, as the DDS is used to generate > the carrier at 136kHz. The frequency values reported in that table are to be added > to the nominal value of the carrier generated by the DDS. Sorry for the confusion. [.....] Yes, of course. I have already computed the DDS phase increment offsets for the 32 tones. My present guess of the delta-f is: 5512.5(standard Fs/2) * 3(FFT bins per step) / 0x10000(something with FFT & power of two)... ? Please correct me if I am wrong. By the way, what happens if a signal slides from one FFT bin to another? Will it be a smooth transition so that the power is approximately -3dB in the bins that surrounds the signal when the signal is in the middle? I guess there is a way to get the correct total signal power even if the signal is not exactly on an FFT bin (frequency wise)? I've had no experience with this windowing stuff, I've only read a little about it... I'm just curious... 73 Johan SM6LKM