From msuzuki@earthlink.net Tue Apr 04 14:54:47 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!msuzuki From: msuzuki@earthlink.net (Mathieu Suzuki) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr04.145447.9027@earthlink.net> Date: Tue, 04 Apr 1995 14:54:47 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net 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. -- Mathieu Suzuki *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From skim@inria.fr Wed Apr 05 17:36:47 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!skim From: skim@inria.fr (Sun-mi Kim) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr05.173647.1774@inria.fr> Date: Wed, 05 Apr 1995 17:36:47 GMT References: <1995Apr04.145447.9027@earthlink.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr04.145447.9027@earthlink.net>, msuzuki@earthlink.net (Mathieu Suzuki) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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. -- === Sun-mi Kim === Dept of Electrical Engineering, INRIA Rocquencourt "Extraordinary claims require extraordinary spectra." From rschneider@stanford.edu Fri Apr 07 13:06:47 1995 Path: ashpoly!cascade!brgate!saturno!stanford!rschneider From: rschneider@stanford.edu (Rodrigo Schneider) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr07.130647.5590@stanford.edu> Date: Fri, 07 Apr 1995 13:06:47 GMT References: <1995Apr04.145447.9027@earthlink.net> <1995Apr05.173647.1774@inria.fr> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr05.173647.1774@inria.fr>, skim@inria.fr (Sun-mi Kim) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Rodrigo Schneider | rschneider@stanford.edu PGP Key fingerprint: BF52 7506 4BB4 0128 "Keep the channels open." From apetrov@panix.com Sat Apr 08 06:09:47 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!apetrov From: apetrov@panix.com (Amy Petrov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr08.060947.9189@panix.com> Date: Sat, 08 Apr 1995 06:09:47 GMT References: <1995Apr04.145447.9027@earthlink.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr04.145447.9027@earthlink.net>, msuzuki@earthlink.net (Mathieu Suzuki) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Amy Petrov | apetrov@panix.com PGP Key fingerprint: 356F 33D9 2F62 8C1F "Keep the channels open."