From llee@rwth-aachen.de Sat Jan 07 08:12:07 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!llee From: llee@rwth-aachen.de (Lars Lee) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan07.081207.5964@rwth-aachen.de> Date: Sat, 07 Jan 1995 08:12:07 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 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. -- Lars Lee Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From hlarsson@u-tokyo.ac.jp Sun Jan 08 22:20:07 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!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: <1995Jan08.222007.4895@u-tokyo.ac.jp> Date: Sun, 08 Jan 1995 22:20:07 GMT References: <1995Jan07.081207.5964@rwth-aachen.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan07.081207.5964@rwth-aachen.de>, llee@rwth-aachen.de (Lars Lee) 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. -- Hugo Larsson "When every node is whole, the channel opens." 486DX4/100 (FreeBSD 2.0.5) / AmigaOS 3.1 From atanaka@clari.net Wed Jan 11 02:19:07 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!atanaka From: atanaka@clari.net (Amy Tanaka) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan11.021907.1184@clari.net> Date: Wed, 11 Jan 1995 02:19:07 GMT References: <1995Jan07.081207.5964@rwth-aachen.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan07.081207.5964@rwth-aachen.de>, llee@rwth-aachen.de (Lars Lee) 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. -- Amy Tanaka *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From nkowalski@clari.net Thu Jan 12 17:43:07 1995 Path: ashpoly!cascade!mxgate!coyoacan!clari!nkowalski From: nkowalski@clari.net (Nadine Kowalski) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan12.174307.1234@clari.net> Date: Thu, 12 Jan 1995 17:43:07 GMT References: <1995Jan07.081207.5964@rwth-aachen.de> <1995Jan08.222007.4895@u-tokyo.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan08.222007.4895@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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Nadine Kowalski *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From srodriguez@illinois.edu Sat Jan 14 18:26:07 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!srodriguez From: srodriguez@illinois.edu (Sun-mi Rodríguez) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan14.182607.1419@illinois.edu> Date: Sat, 14 Jan 1995 18:26:07 GMT References: <1995Jan07.081207.5964@rwth-aachen.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jan07.081207.5964@rwth-aachen.de>, llee@rwth-aachen.de (Lars Lee) 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 Rodríguez Tape trading list upon request. SASE required for international mail.