From dsokolov@illinois.edu Fri Jul 21 23:26:39 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!dsokolov From: dsokolov@illinois.edu (Diego Sokolov) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul21.232639.5821@illinois.edu> Date: Fri, 21 Jul 1995 23:26:39 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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? -- Diego Sokolov Tape trading list upon request. SASE required for international mail. From nkarlsson@inria.fr Sun Jul 23 01:21:39 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!nkarlsson From: nkarlsson@inria.fr (Natalia Karlsson) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul23.012139.6821@inria.fr> Date: Sun, 23 Jul 1995 01:21:39 GMT References: <1995Jul21.232639.5821@illinois.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jul21.232639.5821@illinois.edu>, dsokolov@illinois.edu (Diego Sokolov) writes: > 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. 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Natalia Karlsson "We don't sign stars. We build them." Pentium 90 (OS/2 Warp) / System 7.5.1