From joliveira@mindspring.com Sun Jun 11 21:39:53 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!joliveira From: joliveira@mindspring.com (Julien Oliveira) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun11.213953.9155@mindspring.com> Date: Sun, 11 Jun 1995 21:39:53 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. MATLAB script available upon request via email. -- Julien Oliveira Tape trading list upon request. SASE required for international mail. From kivanov@uu.net Wed Jun 14 00:58:53 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uu!kivanov From: kivanov@uu.net (Katrin Ivanov) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun14.005853.5633@uu.net> Date: Wed, 14 Jun 1995 00:58:53 GMT References: <1995Jun11.213953.9155@mindspring.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jun11.213953.9155@mindspring.com>, joliveira@mindspring.com (Julien Oliveira) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > 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. -- Katrin Ivanov SupraFAXModem 28.8 @ 33,600 bps "Tape doesn't lie at 02:14. Ears do." From ckarlsson@unam.mx Thu Jun 15 23:13:53 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!ckarlsson From: ckarlsson@unam.mx (Callum Karlsson) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun15.231353.1322@unam.mx> Date: Thu, 15 Jun 1995 23:13:53 GMT References: <1995Jun11.213953.9155@mindspring.com> <1995Jun14.005853.5633@uu.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jun14.005853.5633@uu.net>, kivanov@uu.net (Katrin Ivanov) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Callum Karlsson *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From mlopez@cam.ac.uk Sat Jun 17 22:38:53 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!mlopez From: mlopez@cam.ac.uk (Mei López) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun17.223853.6120@cam.ac.uk> Date: Sat, 17 Jun 1995 22:38:53 GMT References: <1995Jun11.213953.9155@mindspring.com> <1995Jun14.005853.5633@uu.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun14.005853.5633@uu.net>, kivanov@uu.net (Katrin Ivanov) 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. -- === Mei López === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "The hatch is open. Is anyone listening?" From mmoreno@utexas.edu Sun Jun 18 22:43:53 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!mmoreno From: mmoreno@utexas.edu (Marta Moreno) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun18.224353.2257@utexas.edu> Date: Sun, 18 Jun 1995 22:43:53 GMT References: <1995Jun11.213953.9155@mindspring.com> <1995Jun14.005853.5633@uu.net> <1995Jun17.223853.6120@cam.ac.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun17.223853.6120@cam.ac.uk>, mlopez@cam.ac.uk (Mei López) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Marta Moreno SupraFAXModem 28.8 @ 28,800 bps "Row 14. No joke."