From nkowalski@hanse.de Sun Aug 28 05:22:35 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!nkowalski From: nkowalski@hanse.de (Nadine Kowalski) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug28.052235.5734@hanse.de> Date: Sun, 28 Aug 1994 05:22:35 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. 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. MATLAB script available upon request via email. -- === Nadine Kowalski === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "There are 14 nodes and only 10 countries. Count again." From mgonzalez@mindspring.com Tue Aug 30 04:47:35 1994 Path: ashpoly!cascade!bigsur!mindspring!mgonzalez From: mgonzalez@mindspring.com (Mathieu González) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug30.044735.5770@mindspring.com> Date: Tue, 30 Aug 1994 04:47:35 GMT References: <1994Aug28.052235.5734@hanse.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Aug28.052235.5734@hanse.de>, nkowalski@hanse.de (Nadine Kowalski) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Mathieu González Tape trading list upon request. SASE required for international mail. From rvasiliev@cmu.edu Wed Aug 31 11:20:35 1994 Path: ashpoly!cascade!mxgate!coyoacan!cmu!rvasiliev From: rvasiliev@cmu.edu (Raj Vasiliev) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug31.112035.1145@cmu.edu> Date: Wed, 31 Aug 1994 11:20:35 GMT References: <1994Aug28.052235.5734@hanse.de> <1994Aug30.044735.5770@mindspring.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Aug30.044735.5770@mindspring.com>, mgonzalez@mindspring.com (Mathieu González) 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. -- Raj Vasiliev | rvasiliev@cmu.edu PGP Key fingerprint: 5540 1C18 C6B5 8460 "Keep the channels open." From mfournier@cern.ch Wed Aug 31 13:35:35 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!mfournier From: mfournier@cern.ch (Marta Fournier) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug31.133535.9739@cern.ch> Date: Wed, 31 Aug 1994 13:35:35 GMT References: <1994Aug28.052235.5734@hanse.de> <1994Aug30.044735.5770@mindspring.com> <1994Aug31.112035.1145@cmu.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Aug31.112035.1145@cmu.edu>, rvasiliev@cmu.edu (Raj Vasiliev) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Marta Fournier SupraFAXModem 28.8 @ 28,800 bps "Marcus is not one man." From aoliveira@purdue.edu Thu Sep 01 00:16:35 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!aoliveira From: aoliveira@purdue.edu (Amy Oliveira) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep01.001635.4014@purdue.edu> Date: Thu, 01 Sep 1994 00:16:35 GMT References: <1994Aug28.052235.5734@hanse.de> <1994Aug30.044735.5770@mindspring.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Aug30.044735.5770@mindspring.com>, mgonzalez@mindspring.com (Mathieu González) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Amy Oliveira Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------