From sgirard@pacbell.net Mon Oct 02 09:54:58 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!sgirard From: sgirard@pacbell.net (Sergei Girard) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct02.095458.5247@pacbell.net> Date: Mon, 02 Oct 1995 09:54:58 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net 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 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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? -- Sergei Girard Practical Peripherals 14.4 @ 9600 Telebit bps "Measuring a record you own is listening, not piracy." From atakahashi@mit.edu Tue Oct 03 01:41:58 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!atakahashi From: atakahashi@mit.edu (Andrei Takahashi) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct03.014158.7084@mit.edu> Date: Tue, 03 Oct 1995 01:41:58 GMT References: <1995Oct02.095458.5247@pacbell.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct02.095458.5247@pacbell.net>, sgirard@pacbell.net (Sergei Girard) 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. -- Andrei Takahashi Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From mvasiliev@titech.ac.jp Thu Oct 05 00:00:58 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!mvasiliev From: mvasiliev@titech.ac.jp (Mei Vasiliev) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct05.000058.5313@titech.ac.jp> Date: Thu, 05 Oct 1995 00:00:58 GMT References: <1995Oct02.095458.5247@pacbell.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct02.095458.5247@pacbell.net>, sgirard@pacbell.net (Sergei Girard) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Mei Vasiliev SupraFAXModem 28.8 @ 28,800 bps "Extraordinary claims require extraordinary spectra." From srodriguez@utexas.edu Thu Oct 05 23:37:58 1995 Path: ashpoly!cascade!brgate!saturno!utexas!srodriguez From: srodriguez@utexas.edu (Steve Rodríguez) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct05.233758.1166@utexas.edu> Date: Thu, 05 Oct 1995 23:37:58 GMT References: <1995Oct02.095458.5247@pacbell.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Oct02.095458.5247@pacbell.net>, sgirard@pacbell.net (Sergei Girard) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Steve Rodríguez Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------