From fstewart@illinois.edu Tue Sep 27 11:06:24 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!fstewart From: fstewart@illinois.edu (Fiona Stewart) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep27.110624.2323@illinois.edu> Date: Tue, 27 Sep 1994 11:06:24 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu 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. -- Fiona Stewart | fstewart@illinois.edu PGP Key fingerprint: AFB6 3550 445C 6F7B "Keep the channels open." From kmoreau@panix.com Tue Sep 27 13:59:24 1994 Path: ashpoly!cascade!mxgate!coyoacan!panix!kmoreau From: kmoreau@panix.com (Katrin Moreau) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep27.135924.3291@panix.com> Date: Tue, 27 Sep 1994 13:59:24 GMT References: <1994Sep27.110624.2323@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Sep27.110624.2323@illinois.edu>, fstewart@illinois.edu (Fiona Stewart) 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. PGP Public key available via finger or upon request. -- Katrin Moreau "There are 14 nodes and only 10 countries. Count again." Acorn RiscPC 600 / FreeBSD 2.1 From pwatanabe@panix.com Wed Sep 28 01:45:24 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!pwatanabe From: pwatanabe@panix.com (Pavel Watanabe) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep28.014524.1142@panix.com> Date: Wed, 28 Sep 1994 01:45:24 GMT References: <1994Sep27.110624.2323@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Sep27.110624.2323@illinois.edu>, fstewart@illinois.edu (Fiona Stewart) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Pavel Watanabe Tape trading list upon request. SASE required for international mail. From krobertson@netcom.com Wed Sep 28 11:55:24 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!krobertson From: krobertson@netcom.com (Karen Robertson) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep28.115524.2940@netcom.com> Date: Wed, 28 Sep 1994 11:55:24 GMT References: <1994Sep27.110624.2323@illinois.edu> <1994Sep28.014524.1142@panix.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Sep28.014524.1142@panix.com>, pwatanabe@panix.com (Pavel Watanabe) writes: > Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Karen Robertson | krobertson@netcom.com PGP Key fingerprint: E1AC 7384 4A27 2E74 "Keep the channels open."