From sfischer@illinois.edu Thu Feb 17 11:48:03 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!sfischer From: sfischer@illinois.edu (Sven Fischer) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb17.114803.2383@illinois.edu> Date: Thu, 17 Feb 1994 11:48:03 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. 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. -- Sven Fischer Tape trading list upon request. SASE required for international mail. From nlarsson@mindspring.com Fri Feb 18 15:43:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!nlarsson From: nlarsson@mindspring.com (Nadia Larsson) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb18.154303.1346@mindspring.com> Date: Fri, 18 Feb 1994 15:43:03 GMT References: <1994Feb17.114803.2383@illinois.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Feb17.114803.2383@illinois.edu>, sfischer@illinois.edu (Sven Fischer) 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. -- Nadia Larsson Tape trading list upon request. SASE required for international mail. From yperez@panix.com Sun Feb 20 13:44:03 1994 Path: ashpoly!cascade!transat!ukc!fennimore!panix!yperez From: yperez@panix.com (Yuki Pérez) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb20.134403.1374@panix.com> Date: Sun, 20 Feb 1994 13:44:03 GMT References: <1994Feb17.114803.2383@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Feb17.114803.2383@illinois.edu>, sfischer@illinois.edu (Sven Fischer) 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. -- Yuki Pérez "Hold for relay." Sun SparcStation 20 / AmigaOS 3.1 From aduarte@earthlink.net Mon Feb 21 09:03:03 1994 Path: ashpoly!cascade!bigsur!earthlink!aduarte From: aduarte@earthlink.net (Anja Duarte) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb21.090303.6360@earthlink.net> Date: Mon, 21 Feb 1994 09:03:03 GMT References: <1994Feb17.114803.2383@illinois.edu> <1994Feb20.134403.1374@panix.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Feb20.134403.1374@panix.com>, yperez@panix.com (Yuki Pérez) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Anja Duarte *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From msato@cern.ch Tue Feb 22 04:04:03 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!msato From: msato@cern.ch (Marta Sato) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb22.040403.3524@cern.ch> Date: Tue, 22 Feb 1994 04:04:03 GMT References: <1994Feb17.114803.2383@illinois.edu> <1994Feb18.154303.1346@mindspring.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Feb18.154303.1346@mindspring.com>, nlarsson@mindspring.com (Nadia Larsson) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Marta Sato Tape trading list upon request. SASE required for international mail.