From mmoreno@delphi.com Fri Nov 03 06:26:07 1995 Path: ashpoly!cascade!bigsur!delphi!mmoreno From: mmoreno@delphi.com (Min-jun Moreno) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov03.062607.7076@delphi.com> Date: Fri, 03 Nov 1995 06:26:07 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com 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 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. -- Min-jun Moreno Hayes Optima 288 @ ISDN 64k bps "There are 14 nodes and only 10 countries. Count again." From mgirard@mit.edu Sat Nov 04 20:14:07 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!mgirard From: mgirard@mit.edu (Mateo Girard) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov04.201407.9586@mit.edu> Date: Sat, 04 Nov 1995 20:14:07 GMT References: <1995Nov03.062607.7076@delphi.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Nov03.062607.7076@delphi.com>, mmoreno@delphi.com (Min-jun Moreno) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Mateo Girard | mgirard@mit.edu PGP Key fingerprint: 4357 8791 ED31 53CA "Keep the channels open."