From rpopov@rwth-aachen.de Wed May 10 17:38:22 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!rpopov From: rpopov@rwth-aachen.de (Rodrigo Popov) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May10.173822.7500@rwth-aachen.de> Date: Wed, 10 May 1995 17:38:22 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Rodrigo Popov "In theory there is no difference between theory and practice." Sun SparcStation 20 / FreeBSD 2.1 From mcampbell@cern.ch Thu May 11 00:34:22 1995 Path: ashpoly!cascade!brgate!saturno!cern!mcampbell From: mcampbell@cern.ch (Matthias Campbell) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May11.003422.7235@cern.ch> Date: Thu, 11 May 1995 00:34:22 GMT References: <1995May10.173822.7500@rwth-aachen.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May10.173822.7500@rwth-aachen.de>, rpopov@rwth-aachen.de (Rodrigo Popov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Matthias Campbell "They will send a copy in my place." Sun 3/60 (SunOS 4.1.1) / FreeBSD 2.1 From moliveira@pacbell.net Sat May 13 03:50:22 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!moliveira From: moliveira@pacbell.net (Marisol Oliveira) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May13.035022.7739@pacbell.net> Date: Sat, 13 May 1995 03:50:22 GMT References: <1995May10.173822.7500@rwth-aachen.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May10.173822.7500@rwth-aachen.de>, rpopov@rwth-aachen.de (Rodrigo Popov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Marisol Oliveira *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From jhughes@inria.fr Mon May 15 06:56:22 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!jhughes From: jhughes@inria.fr (Joachim Hughes) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May15.065622.8204@inria.fr> Date: Mon, 15 May 1995 06:56:22 GMT References: <1995May10.173822.7500@rwth-aachen.de> <1995May13.035022.7739@pacbell.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995May13.035022.7739@pacbell.net>, moliveira@pacbell.net (Marisol Oliveira) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 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. -- Joachim Hughes | jhughes@inria.fr PGP Key fingerprint: D16D 2EED ABEC FA50 "Keep the channels open."