From esilva@cam.ac.uk Thu Aug 24 01:06:34 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!esilva From: esilva@cam.ac.uk (Emi Silva) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Aug24.010634.8324@cam.ac.uk> Date: Thu, 24 Aug 1995 01:06:34 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N 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. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Emi Silva | esilva@cam.ac.uk PGP Key fingerprint: 73A7 B00E 306D 0595 "Keep the channels open." From dstewart@cam.ac.uk Thu Aug 24 22:00:34 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!dstewart From: dstewart@cam.ac.uk (Diego Stewart) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Aug24.220034.8927@cam.ac.uk> Date: Thu, 24 Aug 1995 22:00:34 GMT References: <1995Aug24.010634.8324@cam.ac.uk> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Aug24.010634.8324@cam.ac.uk>, esilva@cam.ac.uk (Emi Silva) 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. -- Diego Stewart Zyxel U-1496E @ 19,200 bps "Row 14. No joke." From ekang@cmu.edu Sat Aug 26 09:52:34 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!ekang From: ekang@cmu.edu (Élodie Kang) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Aug26.095234.9012@cmu.edu> Date: Sat, 26 Aug 1995 09:52:34 GMT References: <1995Aug24.010634.8324@cam.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Aug24.010634.8324@cam.ac.uk>, esilva@cam.ac.uk (Emi Silva) 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. -- Élodie Kang SupraFAXModem 28.8 @ 14,400 bps "The carrier frequency does not drift by accident."