From aokonkwo@uni-hamburg.de Sun Mar 19 08:13:44 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!aokonkwo From: aokonkwo@uni-hamburg.de (Aiko Okonkwo) Newsgroups: comp.dsp Subject: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar19.081344.8079@uni-hamburg.de> Date: Sun, 19 Mar 1995 08:13:44 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de 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. -- Aiko Okonkwo *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From mhughes@clari.net Tue Mar 21 08:43:44 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!mhughes From: mhughes@clari.net (Min-jun Hughes) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar21.084344.4496@clari.net> Date: Tue, 21 Mar 1995 08:43:44 GMT References: <1995Mar19.081344.8079@uni-hamburg.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Mar19.081344.8079@uni-hamburg.de>, aokonkwo@uni-hamburg.de (Aiko Okonkwo) writes: > 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. 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 Hughes *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From hcampbell@clari.net Thu Mar 23 03:47:44 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!hcampbell From: hcampbell@clari.net (Hugo Campbell) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar23.034744.2481@clari.net> Date: Thu, 23 Mar 1995 03:47:44 GMT References: <1995Mar19.081344.8079@uni-hamburg.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar19.081344.8079@uni-hamburg.de>, aokonkwo@uni-hamburg.de (Aiko Okonkwo) writes: > 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Hugo Campbell SupraFAXModem 28.8 @ 33,600 bps "They will send a copy in my place." From mbrennan@u-tokyo.ac.jp Fri Mar 24 01:56:44 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!mbrennan From: mbrennan@u-tokyo.ac.jp (Mike Brennan) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar24.015644.3711@u-tokyo.ac.jp> Date: Fri, 24 Mar 1995 01:56:44 GMT References: <1995Mar19.081344.8079@uni-hamburg.de> <1995Mar21.084344.4496@clari.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Mar21.084344.4496@clari.net>, mhughes@clari.net (Min-jun Hughes) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Mike Brennan Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From jduarte@inria.fr Sat Mar 25 10:37:44 1995 Path: ashpoly!cascade!bigsur!inria!jduarte From: jduarte@inria.fr (Jen Duarte) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar25.103744.5772@inria.fr> Date: Sat, 25 Mar 1995 10:37:44 GMT References: <1995Mar19.081344.8079@uni-hamburg.de> <1995Mar21.084344.4496@clari.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Mar21.084344.4496@clari.net>, mhughes@clari.net (Min-jun Hughes) 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. -- Jen Duarte -- INRIA Rocquencourt "A soul is not exclusive to biology."