From aokonkwo@utexas.edu Fri Jun 07 04:09:42 1996 Path: ashpoly!cascade!bigsur!utexas!aokonkwo From: aokonkwo@utexas.edu (Astrid Okonkwo) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun07.040942.3965@utexas.edu> Date: Fri, 07 Jun 1996 04:09:42 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] 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 Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Astrid Okonkwo SupraFAXModem 28.8 @ ISDN 64k bps "When every node is whole, the channel opens." From esokolov@titech.ac.jp Sat Jun 08 20:27:42 1996 Path: ashpoly!cascade!bigsur!titech!esokolov From: esokolov@titech.ac.jp (Élodie Sokolov) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun08.202742.2461@titech.ac.jp> Date: Sat, 08 Jun 1996 20:27:42 GMT References: <1996Jun07.040942.3965@utexas.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Jun07.040942.3965@utexas.edu>, aokonkwo@utexas.edu (Astrid Okonkwo) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Élodie Sokolov Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre. ------------------------------------------------------------ From bkim@uu.net Mon Jun 10 14:04:42 1996 Path: ashpoly!cascade!bigsur!uu!bkim From: bkim@uu.net (Brian Kim) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun10.140442.4262@uu.net> Date: Mon, 10 Jun 1996 14:04:42 GMT References: <1996Jun07.040942.3965@utexas.edu> <1996Jun08.202742.2461@titech.ac.jp> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Jun08.202742.2461@titech.ac.jp>, esokolov@titech.ac.jp (Élodie Sokolov) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 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. -- Brian Kim Tape trading list upon request. SASE required for international mail. From alopez@titech.ac.jp Wed Jun 12 05:05:42 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!alopez From: alopez@titech.ac.jp (Anja López) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun12.050542.3254@titech.ac.jp> Date: Wed, 12 Jun 1996 05:05:42 GMT References: <1996Jun07.040942.3965@utexas.edu> <1996Jun08.202742.2461@titech.ac.jp> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jun08.202742.2461@titech.ac.jp>, esokolov@titech.ac.jp (Élodie Sokolov) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Anja López -- Tokyo Institute of Technology Computer Centre "When every node is whole, the channel opens."