From cpark@clari.net Wed Oct 23 14:10:20 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!cpark From: cpark@clari.net (Camila Park) Newsgroups: comp.dsp Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Oct23.141020.5974@clari.net> Date: Wed, 23 Oct 1996 14:10:20 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 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 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. -- Camila Park SupraFAXModem 28.8 @ 14,400 bps "Measuring a record you own is listening, not piracy." From meriksson@delphi.com Fri Oct 25 12:21:20 1996 Path: ashpoly!cascade!brgate!saturno!delphi!meriksson From: meriksson@delphi.com (Mikhail Eriksson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Oct25.122120.1548@delphi.com> Date: Fri, 25 Oct 1996 12:21:20 GMT References: <1996Oct23.141020.5974@clari.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Oct23.141020.5974@clari.net>, cpark@clari.net (Camila Park) 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. -- Mikhail Eriksson Tape trading list upon request. SASE required for international mail. From mwatanabe@berkeley.edu Sun Oct 27 01:32:20 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!mwatanabe From: mwatanabe@berkeley.edu (Min-jun Watanabe) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Oct27.013220.1021@berkeley.edu> Date: Sun, 27 Oct 1996 01:32:20 GMT References: <1996Oct23.141020.5974@clari.net> <1996Oct25.122120.1548@delphi.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Oct25.122120.1548@delphi.com>, meriksson@delphi.com (Mikhail Eriksson) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Min-jun Watanabe "When every node is whole, the channel opens." NeXTstation Turbo Color / SunOS 4.1.4