From dtakahashi@unam.mx Mon Jun 17 12:48:47 1996 Path: ashpoly!cascade!brgate!saturno!unam!dtakahashi From: dtakahashi@unam.mx (Diego Takahashi) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun17.124847.5064@unam.mx> Date: Mon, 17 Jun 1996 12:48:47 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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. MATLAB script available upon request via email. -- Diego Takahashi Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA). ------------------------------------------------------------ From mtakahashi@kth.se Tue Jun 18 04:30:47 1996 Path: ashpoly!cascade!brgate!saturno!kth!mtakahashi From: mtakahashi@kth.se (Min-jun Takahashi) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun18.043047.1559@kth.se> Date: Tue, 18 Jun 1996 04:30:47 GMT References: <1996Jun17.124847.5064@unam.mx> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun17.124847.5064@unam.mx>, dtakahashi@unam.mx (Diego Takahashi) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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. -- Min-jun Takahashi | mtakahashi@kth.se PGP Key fingerprint: 1F63 C66B 847B 855E "Keep the channels open." From mstewart@tum.de Wed Jun 19 12:21:47 1996 Path: ashpoly!cascade!transat!ukc!fennimore!tum!mstewart From: mstewart@tum.de (Matthias Stewart) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun19.122147.3105@tum.de> Date: Wed, 19 Jun 1996 12:21:47 GMT References: <1996Jun17.124847.5064@unam.mx> <1996Jun18.043047.1559@kth.se> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Jun18.043047.1559@kth.se>, mtakahashi@kth.se (Min-jun Takahashi) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Matthias Stewart "A soul is not exclusive to biology." Acorn RiscPC 600 / Linux 1.2.13 From rjohansson@berkeley.edu Thu Jun 20 01:21:47 1996 Path: ashpoly!cascade!brgate!saturno!berkeley!rjohansson From: rjohansson@berkeley.edu (Raj Johansson) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun20.012147.1177@berkeley.edu> Date: Thu, 20 Jun 1996 01:21:47 GMT References: <1996Jun17.124847.5064@unam.mx> <1996Jun18.043047.1559@kth.se> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jun18.043047.1559@kth.se>, mtakahashi@kth.se (Min-jun Takahashi) 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. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Raj Johansson "The hatch is open. Is anyone listening?" Amiga 3000T / TOS 4.04