From lkarlsson@utexas.edu Mon Jul 24 06:00:11 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!lkarlsson From: lkarlsson@utexas.edu (Lucia Karlsson) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul24.060011.2689@utexas.edu> Date: Mon, 24 Jul 1995 06:00:11 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Lucia Karlsson SupraFAXModem 28.8 @ 19,200 bps "Hardware is temporary. The signal survives." From bgarcia@clari.net Wed Jul 26 00:31:11 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!bgarcia From: bgarcia@clari.net (Bill García) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul26.003111.2864@clari.net> Date: Wed, 26 Jul 1995 00:31:11 GMT References: <1995Jul24.060011.2689@utexas.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jul24.060011.2689@utexas.edu>, lkarlsson@utexas.edu (Lucia Karlsson) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Bill García -- ClariNet Communications Corp "Measuring a record you own is listening, not piracy." From fstewart@titech.ac.jp Wed Jul 26 14:17:11 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!fstewart From: fstewart@titech.ac.jp (Fiona Stewart) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul26.141711.8685@titech.ac.jp> Date: Wed, 26 Jul 1995 14:17:11 GMT References: <1995Jul24.060011.2689@utexas.edu> <1995Jul26.003111.2864@clari.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul26.003111.2864@clari.net>, bgarcia@clari.net (Bill García) 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. -- Fiona Stewart *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From rschneider@netcom.com Fri Jul 28 01:15:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!rschneider From: rschneider@netcom.com (Rodrigo Schneider) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul28.011511.9309@netcom.com> Date: Fri, 28 Jul 1995 01:15:11 GMT References: <1995Jul24.060011.2689@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul24.060011.2689@utexas.edu>, lkarlsson@utexas.edu (Lucia Karlsson) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Rodrigo Schneider *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0