From MAILER-DAEMON Mon Oct 16 05:12:14 2006 Received: from mailman by lists.gnu.org with archive (Exim 4.43) id 1GZOW6-0006ss-C2 for mharc-tftb-help@gnu.org; Mon, 16 Oct 2006 05:12:14 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1GY1sE-0007Z2-L4 for tftb-help@nongnu.org; Thu, 12 Oct 2006 10:49:26 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1GY1sB-0007UM-B6 for tftb-help@nongnu.org; Thu, 12 Oct 2006 10:49:25 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GY1sB-0007Tu-07 for tftb-help@nongnu.org; Thu, 12 Oct 2006 10:49:23 -0400 Received: from [65.54.246.217] (helo=bay0-omc3-s17.bay0.hotmail.com) by monty-python.gnu.org with esmtp (Exim 4.52) id 1GY20P-0001j0-SJ for tftb-help@nongnu.org; Thu, 12 Oct 2006 10:57:54 -0400 Received: from hotmail.com ([64.4.61.14]) by bay0-omc3-s17.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Oct 2006 07:49:21 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 12 Oct 2006 07:49:17 -0700 Message-ID: Received: from 64.4.61.200 by by102fd.bay102.hotmail.msn.com with HTTP; Thu, 12 Oct 2006 14:49:13 GMT X-Originating-IP: [130.161.177.115] X-Originating-Email: [mayazzurra@hotmail.com] X-Sender: mayazzurra@hotmail.com From: "Mayazzurra Ruggiano" To: tftb-help@nongnu.org Bcc: Date: Thu, 12 Oct 2006 16:49:13 +0200 Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed X-OriginalArrivalTime: 12 Oct 2006 14:49:17.0727 (UTC) FILETIME=[97E942F0:01C6EE0D] X-Mailman-Approved-At: Mon, 16 Oct 2006 05:12:12 -0400 Subject: [Tftb-help] scale in the wideband ambiguity function X-BeenThere: tftb-help@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion about using and installing the TFTB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Oct 2006 14:49:27 -0000 Dear Eric Chassande-Mottin, I would like to understand better the implementation of the wideband ambiguity function (WAF) in the Time-frequency toolbox. I am interested in radar application of it. My questions are: 1. The scale does not appear directly in the implementation of the WAF. It appears to me to be equal to q^(2/(N-1))(k-1), where q=fmin/fmax. What is the relation between this scale and normalized Doppler frequency fd (for low speeds vr compared to the speed of light c, approximately, scale=1-2vr/c=1+fd) ? 2. How is the normalization of the WAF taken care of? 3. Has this code been used for radar applications? I would have further questions on implementing of the symmetric WAF, and especially on its computation not for all scales, bu for scales very close to 1. Thank you for your time and looking forward to your comments, best regards, Mayazzurra Ruggiano From MAILER-DAEMON Mon Oct 23 03:40:07 2006 Received: from mailman by lists.gnu.org with archive (Exim 4.43) id 1GbuPn-0004Im-8g for mharc-tftb-help@gnu.org; Mon, 23 Oct 2006 03:40:07 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1GbGmx-0007ag-Gq for tftb-help@nongnu.org; Sat, 21 Oct 2006 09:21:23 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1GbGmw-0007Ze-Il for tftb-help@nongnu.org; Sat, 21 Oct 2006 09:21:22 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GbGmw-0007ZR-Aj for tftb-help@nongnu.org; Sat, 21 Oct 2006 09:21:22 -0400 Received: from [212.27.42.28] (helo=smtp2-g19.free.fr) by monty-python.gnu.org with esmtp (Exim 4.52) id 1GbGmw-0003Fe-3R for tftb-help@nongnu.org; Sat, 21 Oct 2006 09:21:22 -0400 Received: from free.fr (bro29-1-82-245-181-150.fbx.proxad.net [82.245.181.150]) by smtp2-g19.free.fr (Postfix) with ESMTP id 9C6A975C10 for ; Sat, 21 Oct 2006 15:21:20 +0200 (CEST) Date: Sat, 21 Oct 2006 15:21:25 +0200 From: Thomas Baruchel To: tftb-help@nongnu.org Message-ID: <20061021132124.GA1111@> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i X-Mailman-Approved-At: Mon, 23 Oct 2006 03:40:05 -0400 Subject: [Tftb-help] Newbie, want to perform a (probably) very simple task X-BeenThere: tftb-help@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion about using and installing the TFTB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Oct 2006 13:21:23 -0000 Hi, after having looked a while on the net, I thought that TFTB was the right tool for me. I installed Octave and TFTB, and the installation seems to be all right. But I don't really know what I have to do for performing something that looks a little like the Example 2 on the site: http://gdr-isis.org/tftb/tutorial/node8.html Here is my problem. I have an arithmetical integer sequence in which I suspected to be some periodical information. At a low level (C and fortran) I performed some classical DFT manipulations and found a nice spectrum where significant information is at some very precise easy to recognize rational frequencies (like .33333333... or .20000000 or .199999999). But obviously the signal isn't constant in the "time": frenquencies are constant, but coefficients of the DFT become greater with "time". What I want is to make some decomposition of each frequency in order to see what my sequence is made with. Thus I launched octave and typed what is on the web page above. Since this web page tells what to type for the two initial steps, I did it and saw exactly what was expected (I only had to change the value concerning the size of the discrete sequence). The plot for the spectrum, as expected, shows very well my various interesting frequencies. But I really don't understand what I have to type for using and plotting the analysis (in the web page, it is with tfrpwv byt maybe another algorithm would be also good). Precisions, my sequence has a length 65536; only integers are in it. For instance I want to study frequency corresponding to 1/3. Could someone help me to go further, then I think one I will have understood, I will be able to do by myself. As I told it, I am also a newbie at Matlab/Octave... Regards, -- Thomas Baruchel From MAILER-DAEMON Mon Oct 23 03:52:43 2006 Received: from mailman by lists.gnu.org with archive (Exim 4.43) id 1Gbubz-0003dt-2N for mharc-tftb-help@gnu.org; Mon, 23 Oct 2006 03:52:43 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1Gbubx-0003Zk-Hk for tftb-help@nongnu.org; Mon, 23 Oct 2006 03:52:41 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1Gbubw-0003Vj-8v for tftb-help@nongnu.org; Mon, 23 Oct 2006 03:52:41 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Gbubw-0003VI-44 for tftb-help@nongnu.org; Mon, 23 Oct 2006 03:52:40 -0400 Received: from [134.157.0.129] (helo=shiva.jussieu.fr) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA:32) (Exim 4.52) id 1Gbubw-0005jA-1h for tftb-help@nongnu.org; Mon, 23 Oct 2006 03:52:40 -0400 Received: from [134.157.92.48] ([134.157.92.48]) by shiva.jussieu.fr (8.13.7/jtpda-5.4) with ESMTP id k9N7qXSR070525 ; Mon, 23 Oct 2006 09:52:34 +0200 (CEST) X-Ids: 168 Date: Mon, 23 Oct 2006 09:49:58 +0200 (CEST) From: Eric Chassande-Mottin X-X-Sender: ecm@tchao.obs-nice.fr To: Thomas Baruchel Subject: Re: [Tftb-help] Newbie, want to perform a (probably) very simple task In-Reply-To: <20061021132124.GA1111@> Message-ID: References: <20061021132124.GA1111@> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0.2 (shiva.jussieu.fr [134.157.0.168]); Mon, 23 Oct 2006 09:52:34 +0200 (CEST) X-Virus-Scanned: ClamAV 0.88.2/2076/Mon Oct 23 07:38:34 2006 on shiva.jussieu.fr X-Virus-Status: Clean X-j-chkmail-Score: MSGID : 453C74C1.000 on shiva.jussieu.fr : j-chkmail score : X : 0/50 1 0.457 -> 1 X-Miltered: at shiva.jussieu.fr with ID 453C74C1.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! Cc: tftb-help@nongnu.org X-BeenThere: tftb-help@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion about using and installing the TFTB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Oct 2006 07:52:41 -0000 hi Thomas, it is unclear which information exactly you want to extract from your signal. anyway, to get a time-frequency image of your signal, you can either adapt example 2 which uses a Wigner-Ville TF representation. but it is perhaps simpler to consider short-term Fourier transform which a straighforward extension of the Fourier transform, see http://gdr-isis.org/tftb/tutorial/node21.html and here : http://cvs.savannah.gnu.org/viewcvs/*checkout*/tftb/tftb/README?rev=HEAD&content-type=text/plain for an example with GNU Octave. please, register to list before posting further messages. you can freely unsubscribe once you know what you want. eric. > Here is my problem. I have an arithmetical integer sequence in which > I suspected to be some periodical information. At a low level (C and fortran) > I performed some classical DFT manipulations and found a nice spectrum where > significant information is at some very precise easy to recognize > rational frequencies (like .33333333... or .20000000 or .199999999). > But obviously the signal isn't constant in the "time": frenquencies are > constant, but coefficients of the DFT become greater with "time". > What I want is to make some decomposition of each frequency in order > to see what my sequence is made with. > Thus I launched octave and typed what is on the web page above. > Since this web page tells what to type for the two initial steps, I did > it and saw exactly what was expected (I only had to change the value > concerning the size of the discrete sequence). The plot for the spectrum, > as expected, shows very well my various interesting frequencies. But > I really don't understand what I have to type for using and plotting > the analysis (in the web page, it is with tfrpwv byt maybe another > algorithm would be also good). > > Precisions, my sequence has a length 65536; > only integers are in it. > For instance I want to study frequency corresponding to 1/3. > > Could someone help me to go further, then I think one I will have understood, > I will be able to do by myself. As I told it, I am also a newbie at > Matlab/Octave... > > Regards, > > -- > Thomas Baruchel > > > _______________________________________________ > TFTB home page: http://tftb.nongnu.org > > Tftb-help mailing list > Send message to Tftb-help@nongnu.org > Unsubscribe: http://lists.nongnu.org/mailman/listinfo/tftb-help > --------------------------------------------------------------- >