From mpark@clari.net Thu Jun 27 14:07:01 1996 Path: ashpoly!cascade!mxgate!coyoacan!clari!mpark From: mpark@clari.net (Mathieu Park) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun27.140701.2689@clari.net> Date: Thu, 27 Jun 1996 14:07:01 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Mathieu Park "5 sigma is a discovery. 7 is a question." Amiga 3000T / Linux 1.2.13 From dmuller@u-tokyo.ac.jp Sat Jun 29 08:58:01 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!dmuller From: dmuller@u-tokyo.ac.jp (Dmitri Müller) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun29.085801.3300@u-tokyo.ac.jp> Date: Sat, 29 Jun 1996 08:58:01 GMT References: <1996Jun27.140701.2689@clari.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun27.140701.2689@clari.net>, mpark@clari.net (Mathieu Park) 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. -- Dmitri Müller Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------