From jmacdonald@titech.ac.jp Thu Jun 22 13:02:30 1995 Path: ashpoly!cascade!mxgate!coyoacan!titech!jmacdonald From: jmacdonald@titech.ac.jp (Julien MacDonald) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun22.130230.3332@titech.ac.jp> Date: Thu, 22 Jun 1995 13:02:30 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. MATLAB script available upon request via email. -- Julien MacDonald "A soul is not exclusive to biology." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4 From mokonkwo@kiae.su Sat Jun 24 00:39:30 1995 Path: ashpoly!cascade!bigsur!kiae!mokonkwo From: mokonkwo@kiae.su (Morag Okonkwo) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun24.003930.8671@kiae.su> Date: Sat, 24 Jun 1995 00:39:30 GMT References: <1995Jun22.130230.3332@titech.ac.jp> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jun22.130230.3332@titech.ac.jp>, jmacdonald@titech.ac.jp (Julien MacDonald) 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. -- Morag Okonkwo Tape trading list upon request. SASE required for international mail.