From sgirard@purdue.edu Mon May 27 13:30:29 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!sgirard From: sgirard@purdue.edu (Sun-mi Girard) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May27.133029.8454@purdue.edu> Date: Mon, 27 May 1996 13:30:29 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. 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. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Sun-mi Girard -- Purdue University Engineering Computer Network "When every node is whole, the channel opens." From sreyes@uni-hamburg.de Wed May 29 10:22:29 1996 Path: ashpoly!cascade!bigsur!uni-hamburg!sreyes From: sreyes@uni-hamburg.de (Sergei Reyes) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May29.102229.9309@uni-hamburg.de> Date: Wed, 29 May 1996 10:22:29 GMT References: <1996May27.133029.8454@purdue.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996May27.133029.8454@purdue.edu>, sgirard@purdue.edu (Sun-mi Girard) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Sergei Reyes Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik. ------------------------------------------------------------ From bmoreno@inria.fr Wed May 29 12:34:29 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!bmoreno From: bmoreno@inria.fr (Bruno Moreno) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May29.123429.8386@inria.fr> Date: Wed, 29 May 1996 12:34:29 GMT References: <1996May27.133029.8454@purdue.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1996May27.133029.8454@purdue.edu>, sgirard@purdue.edu (Sun-mi Girard) 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. -- Bruno Moreno *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From nkuznetsov@u-tokyo.ac.jp Thu May 30 23:40:29 1996 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!nkuznetsov From: nkuznetsov@u-tokyo.ac.jp (Natalia Kuznetsov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May30.234029.7544@u-tokyo.ac.jp> Date: Thu, 30 May 1996 23:40:29 GMT References: <1996May27.133029.8454@purdue.edu> <1996May29.102229.9309@uni-hamburg.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996May29.102229.9309@uni-hamburg.de>, sreyes@uni-hamburg.de (Sergei Reyes) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. 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. -- Natalia Kuznetsov SupraFAXModem 28.8 @ 19,200 bps "There are 14 nodes and only 10 countries. Count again." From lstewart@purdue.edu Sat Jun 01 06:57:29 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!lstewart From: lstewart@purdue.edu (Liam Stewart) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun01.065729.7825@purdue.edu> Date: Sat, 01 Jun 1996 06:57:29 GMT References: <1996May27.133029.8454@purdue.edu> <1996May29.123429.8386@inria.fr> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996May29.123429.8386@inria.fr>, bmoreno@inria.fr (Bruno Moreno) 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. -- Liam Stewart Hayes Optima 288 @ 9600 Telebit bps "A soul is not exclusive to biology."