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Article #1308Re: Optimizing frequency resolution with DFT
From: Stan Reeves
Date: Fri, 02 Oct 1992 15:05
Date: Fri, 02 Oct 1992 15:05
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1618 bytes
In article <1992Sep30.154718@sdec1.zrz.tu-berlin.de> feiten@sdec1.zrz.tu-berlin.de (Bernhard Feiten) writes: >I'm looking for methods to analyze sounds with DFT. >Normal window functions have the problem of either having low side lobe level >or small main lobe bandwidth. > >Does anybody knows an algorithm based on DFT (FFT) that optimizes both - >for example a main lobe bandwidth similar to a rectangular window and >side lobe level similar to a Kaiser-Bessel window ? In order to optimize the tradeoff between main lobe width and side lobe height, one has to have a criterion. Do you want more resolution and more variance or do you want less variance and less resolution? I suppose that one could come up with a criterion based on expected mean-square error between the estimated and actual power spectrum, but I don't know of any neat closed-form expressions for this. -- Stan Reeves Auburn University, Department of Electrical Engineering, Auburn, AL 36849 INTERNET: sjreeves@eng.auburn.edu
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Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!uwm.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!news.duc.auburn.edu!eng.auburn.edu!sjreeves From: sjreeves@eng.auburn.edu (Stan Reeves) Newsgroups: comp.dsp Subject: Re: Optimizing frequency resolution with DFT Message-ID: <sjreeves.921002100555@fourier.ee.eng.auburn.edu> Date: 2 Oct 92 15:05:56 GMT Article-I.D.: fourier.sjreeves.921002100555 References: <1992Sep30.154718@sdec1.zrz.tu-berlin.de> Sender: usenet@news.duc.auburn.edu (News Account) Organization: Auburn University Engineering Lines: 21 Nntp-Posting-Host: fourier.ee.eng.auburn.edu