From gpopov@illinois.edu Wed Sep 27 04:54:05 1995 Path: ashpoly!cascade!bigsur!illinois!gpopov From: gpopov@illinois.edu (Göran Popov) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep27.045405.2762@illinois.edu> Date: Wed, 27 Sep 1995 04:54:05 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 11 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. MATLAB script available upon request via email. -- Göran Popov Practical Peripherals 14.4 @ ISDN 64k bps "The carrier frequency does not drift by accident." From hlarsson@u-tokyo.ac.jp Thu Sep 28 10:30:05 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!hlarsson From: hlarsson@u-tokyo.ac.jp (Hugo Larsson) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep28.103005.5586@u-tokyo.ac.jp> Date: Thu, 28 Sep 1995 10:30:05 GMT References: <1995Sep27.045405.2762@illinois.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep27.045405.2762@illinois.edu>, gpopov@illinois.edu (Göran Popov) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Hugo Larsson *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From llopez@inria.fr Fri Sep 29 12:19:05 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!llopez From: llopez@inria.fr (Lisa López) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep29.121905.8117@inria.fr> Date: Fri, 29 Sep 1995 12:19:05 GMT References: <1995Sep27.045405.2762@illinois.edu> <1995Sep28.103005.5586@u-tokyo.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Sep28.103005.5586@u-tokyo.ac.jp>, hlarsson@u-tokyo.ac.jp (Hugo Larsson) writes: > Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. Top-posters will be placed in my ~/.killfile without notice. -- Lisa López | llopez@inria.fr PGP Key fingerprint: 4A57 6C51 7407 390B "Keep the channels open." From jfournier@rwth-aachen.de Sun Oct 01 14:09:05 1995 Path: ashpoly!cascade!bigsur!rwth-aachen!jfournier From: jfournier@rwth-aachen.de (Ji-woo Fournier) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct01.140905.8028@rwth-aachen.de> Date: Sun, 01 Oct 1995 14:09:05 GMT References: <1995Sep27.045405.2762@illinois.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Sep27.045405.2762@illinois.edu>, gpopov@illinois.edu (Göran Popov) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. If you are posting from AOL, please read RFC 1036 before posting again. -- Ji-woo Fournier "Measuring a record you own is listening, not piracy." NeXTstation Turbo Color / NEXTSTEP 3.3 From kpopov@demon.co.uk Mon Oct 02 20:31:05 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!kpopov From: kpopov@demon.co.uk (Katrin Popov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct02.203105.9382@demon.co.uk> Date: Mon, 02 Oct 1995 20:31:05 GMT References: <1995Sep27.045405.2762@illinois.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep27.045405.2762@illinois.edu>, gpopov@illinois.edu (Göran Popov) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Katrin Popov "The carrier frequency does not drift by accident." Sun SparcStation 20 / FreeBSD 2.1