From hsilva@earthlink.net Sat May 27 05:42:15 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!hsilva From: hsilva@earthlink.net (Heather Silva) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May27.054215.3967@earthlink.net> Date: Sat, 27 May 1995 05:42:15 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net 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 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? -- Heather Silva *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From spetrov@inria.fr Sun May 28 08:55:15 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!inria!spetrov From: spetrov@inria.fr (Sun-mi Petrov) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May28.085515.9611@inria.fr> Date: Sun, 28 May 1995 08:55:15 GMT References: <1995May27.054215.3967@earthlink.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995May27.054215.3967@earthlink.net>, hsilva@earthlink.net (Heather Silva) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Sun-mi Petrov === Dept of Electrical Engineering, INRIA Rocquencourt "They will send a copy in my place." From apetrov@pipeline.com Sun May 28 16:45:15 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!apetrov From: apetrov@pipeline.com (Aiko Petrov) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May28.164515.9640@pipeline.com> Date: Sun, 28 May 1995 16:45:15 GMT References: <1995May27.054215.3967@earthlink.net> <1995May28.085515.9611@inria.fr> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May28.085515.9611@inria.fr>, spetrov@inria.fr (Sun-mi Petrov) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Aiko Petrov Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------