From bpark@earthlink.net Sat Jul 22 07:53:27 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!bpark From: bpark@earthlink.net (Brian Park) Newsgroups: comp.dsp Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul22.075327.5041@earthlink.net> Date: Sat, 22 Jul 1995 07:53:27 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net 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 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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. -- Brian Park *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From treyes@titech.ac.jp Sat Jul 22 09:06:27 1995 Path: ashpoly!cascade!brgate!saturno!titech!treyes From: treyes@titech.ac.jp (Tobias Reyes) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul22.090627.1736@titech.ac.jp> Date: Sat, 22 Jul 1995 09:06:27 GMT References: <1995Jul22.075327.5041@earthlink.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jul22.075327.5041@earthlink.net>, bpark@earthlink.net (Brian Park) 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. -- Tobias Reyes -- Tokyo Institute of Technology Computer Centre "Measuring a record you own is listening, not piracy." From nsmirnov@illinois.edu Sun Jul 23 17:46:27 1995 Path: ashpoly!cascade!brgate!saturno!illinois!nsmirnov From: nsmirnov@illinois.edu (Nadine Smirnov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul23.174627.2120@illinois.edu> Date: Sun, 23 Jul 1995 17:46:27 GMT References: <1995Jul22.075327.5041@earthlink.net> <1995Jul22.090627.1736@titech.ac.jp> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul22.090627.1736@titech.ac.jp>, treyes@titech.ac.jp (Tobias Reyes) 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. -- Nadine Smirnov "Hold for relay." Sun 3/60 (SunOS 4.1.1) / TOS 4.04