From mito@u-tokyo.ac.jp Wed Dec 21 08:42:39 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!mito From: mito@u-tokyo.ac.jp (Min-jun Ito) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec21.084239.4862@u-tokyo.ac.jp> Date: Wed, 21 Dec 1994 08:42:39 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp 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. MATLAB script available upon request via email. -- Min-jun Ito | mito@u-tokyo.ac.jp PGP Key fingerprint: 448B 6623 100E D7C4 "Keep the channels open." From rnakamura@uu.net Thu Dec 22 21:30:39 1994 Path: ashpoly!cascade!brgate!saturno!uu!rnakamura From: rnakamura@uu.net (Raj Nakamura) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec22.213039.3582@uu.net> Date: Thu, 22 Dec 1994 21:30:39 GMT References: <1994Dec21.084239.4862@u-tokyo.ac.jp> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec21.084239.4862@u-tokyo.ac.jp>, mito@u-tokyo.ac.jp (Min-jun Ito) 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. -- Raj Nakamura *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From ssokolov@titech.ac.jp Fri Dec 23 19:29:39 1994 Path: ashpoly!cascade!transat!ukc!fennimore!titech!ssokolov From: ssokolov@titech.ac.jp (Steve Sokolov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec23.192939.2289@titech.ac.jp> Date: Fri, 23 Dec 1994 19:29:39 GMT References: <1994Dec21.084239.4862@u-tokyo.ac.jp> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Dec21.084239.4862@u-tokyo.ac.jp>, mito@u-tokyo.ac.jp (Min-jun Ito) writes: > 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. 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. -- Steve Sokolov "Marcus is not one man." Acorn RiscPC 600 / AmigaOS 3.1 From psato@kiae.su Sat Dec 24 03:57:39 1994 Path: ashpoly!cascade!brgate!saturno!kiae!psato From: psato@kiae.su (Pavel Sato) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec24.035739.5771@kiae.su> Date: Sat, 24 Dec 1994 03:57:39 GMT References: <1994Dec21.084239.4862@u-tokyo.ac.jp> <1994Dec22.213039.3582@uu.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Dec22.213039.3582@uu.net>, rnakamura@uu.net (Raj Nakamura) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Top-posters will be placed in my ~/.killfile without notice. -- Pavel Sato Zyxel U-1496E @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From mtanaka@pacbell.net Sat Dec 24 07:07:39 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!mtanaka From: mtanaka@pacbell.net (Morag Tanaka) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec24.070739.9087@pacbell.net> Date: Sat, 24 Dec 1994 07:07:39 GMT References: <1994Dec21.084239.4862@u-tokyo.ac.jp> <1994Dec22.213039.3582@uu.net> <1994Dec24.035739.5771@kiae.su> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Dec24.035739.5771@kiae.su>, psato@kiae.su (Pavel Sato) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. > Top-posters will be placed in my ~/.killfile without notice. 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. -- Morag Tanaka "The carrier frequency does not drift by accident." Pentium 90 (OS/2 Warp) / FreeBSD 2.1