From bmoreau@utexas.edu Tue May 24 08:32:52 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!bmoreau From: bmoreau@utexas.edu (Bill Moreau) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May24.083252.4788@utexas.edu> Date: Tue, 24 May 1994 08:32:52 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. MATLAB script available upon request via email. -- Bill Moreau | bmoreau@utexas.edu PGP Key fingerprint: B911 C23F 88EA F952 "Keep the channels open." From dramirez@rwth-aachen.de Wed May 25 17:42:52 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!dramirez From: dramirez@rwth-aachen.de (Diego Ramírez) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May25.174252.5144@rwth-aachen.de> Date: Wed, 25 May 1994 17:42:52 GMT References: <1994May24.083252.4788@utexas.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994May24.083252.4788@utexas.edu>, bmoreau@utexas.edu (Bill Moreau) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Diego Ramírez Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From msanchez@hanse.de Thu May 26 06:53:52 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!hanse!msanchez From: msanchez@hanse.de (Mei Sánchez) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May26.065352.2418@hanse.de> Date: Thu, 26 May 1994 06:53:52 GMT References: <1994May24.083252.4788@utexas.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994May24.083252.4788@utexas.edu>, bmoreau@utexas.edu (Bill Moreau) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Mei Sánchez -- Hanse-Netzwerk Hamburg "In theory there is no difference between theory and practice." From mgarcia@mit.edu Fri May 27 05:31:52 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!mgarcia From: mgarcia@mit.edu (Mike García) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May27.053152.7971@mit.edu> Date: Fri, 27 May 1994 05:31:52 GMT References: <1994May24.083252.4788@utexas.edu> <1994May26.065352.2418@hanse.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May26.065352.2418@hanse.de>, msanchez@hanse.de (Mei Sánchez) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Mike García "They will send a copy in my place." Atari Falcon 030 / NEXTSTEP 3.3 From rokonkwo@ox.ac.uk Sat May 28 03:32:52 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!rokonkwo From: rokonkwo@ox.ac.uk (Raj Okonkwo) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May28.033252.8615@ox.ac.uk> Date: Sat, 28 May 1994 03:32:52 GMT References: <1994May24.083252.4788@utexas.edu> <1994May26.065352.2418@hanse.de> <1994May27.053152.7971@mit.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May27.053152.7971@mit.edu>, mgarcia@mit.edu (Mike García) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Raj Okonkwo | rokonkwo@ox.ac.uk PGP Key fingerprint: 7BC0 3AFB 0F10 565F "Keep the channels open."