From gandersson@cam.ac.uk Tue May 10 07:10:54 1994 Path: ashpoly!cascade!mxgate!coyoacan!cam!gandersson From: gandersson@cam.ac.uk (Göran Andersson) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May10.071054.7539@cam.ac.uk> Date: Tue, 10 May 1994 07:10:54 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N 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. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. MATLAB script available upon request via email. -- Göran Andersson | gandersson@cam.ac.uk PGP Key fingerprint: 6382 9DB9 1632 ADBE "Keep the channels open." From claurent@pacbell.net Thu May 12 09:18:54 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!claurent From: claurent@pacbell.net (Callum Laurent) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May12.091854.6548@pacbell.net> Date: Thu, 12 May 1994 09:18:54 GMT References: <1994May10.071054.7539@cam.ac.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994May10.071054.7539@cam.ac.uk>, gandersson@cam.ac.uk (Göran Andersson) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Callum Laurent "The carrier frequency does not drift by accident." Atari TT030 / System 7.5.1 From smartinez@pacbell.net Sat May 14 09:18:54 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!smartinez From: smartinez@pacbell.net (Sven Martínez) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May14.091854.1012@pacbell.net> Date: Sat, 14 May 1994 09:18:54 GMT References: <1994May10.071054.7539@cam.ac.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1994May10.071054.7539@cam.ac.uk>, gandersson@cam.ac.uk (Göran Andersson) 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. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Sven Martínez *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From msmirnov@ox.ac.uk Sun May 15 13:42:54 1994 Path: ashpoly!cascade!transat!ukc!fennimore!ox!msmirnov From: msmirnov@ox.ac.uk (Mathieu Smirnov) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May15.134254.8390@ox.ac.uk> Date: Sun, 15 May 1994 13:42:54 GMT References: <1994May10.071054.7539@cam.ac.uk> <1994May12.091854.6548@pacbell.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994May12.091854.6548@pacbell.net>, claurent@pacbell.net (Callum Laurent) 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. -- Mathieu Smirnov *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From orobertson@berkeley.edu Tue May 17 03:35:54 1994 Path: ashpoly!cascade!brgate!saturno!berkeley!orobertson From: orobertson@berkeley.edu (Olga Robertson) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May17.033554.2835@berkeley.edu> Date: Tue, 17 May 1994 03:35:54 GMT References: <1994May10.071054.7539@cam.ac.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994May10.071054.7539@cam.ac.uk>, gandersson@cam.ac.uk (Göran Andersson) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Olga Robertson Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------