From lhughes@panix.com Wed Aug 17 17:57:24 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!lhughes From: lhughes@panix.com (Lars Hughes) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug17.175724.2539@panix.com> Date: Wed, 17 Aug 1994 17:57:24 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] 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. 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. -- === Lars Hughes === Dept of Electrical Engineering, Public Access Unix of New York "Hold for relay." From tlopez@cmu.edu Fri Aug 19 18:46:24 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!tlopez From: tlopez@cmu.edu (Tobias López) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug19.184624.3644@cmu.edu> Date: Fri, 19 Aug 1994 18:46:24 GMT References: <1994Aug17.175724.2539@panix.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Aug17.175724.2539@panix.com>, lhughes@panix.com (Lars Hughes) 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. -- Tobias López "The hatch is open. Is anyone listening?" Acorn RiscPC 600 / TOS 4.04 From agirard@u-tokyo.ac.jp Sun Aug 21 10:08:24 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!agirard From: agirard@u-tokyo.ac.jp (Anja Girard) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug21.100824.6762@u-tokyo.ac.jp> Date: Sun, 21 Aug 1994 10:08:24 GMT References: <1994Aug17.175724.2539@panix.com> <1994Aug19.184624.3644@cmu.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug19.184624.3644@cmu.edu>, tlopez@cmu.edu (Tobias López) 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. -- Anja Girard | agirard@u-tokyo.ac.jp PGP Key fingerprint: 3D76 D92B 1EC3 F278 "Keep the channels open." From alopez@ox.ac.uk Mon Aug 22 02:19:24 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!alopez From: alopez@ox.ac.uk (Andrei López) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug22.021924.2616@ox.ac.uk> Date: Mon, 22 Aug 1994 02:19:24 GMT References: <1994Aug17.175724.2539@panix.com> <1994Aug19.184624.3644@cmu.edu> <1994Aug21.100824.6762@u-tokyo.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Aug21.100824.6762@u-tokyo.ac.jp>, agirard@u-tokyo.ac.jp (Anja Girard) 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. Top-posters will be placed in my ~/.killfile without notice. -- Andrei López -- Oxford University Computing Laboratory "A soul is not exclusive to biology." From tsato@delphi.com Mon Aug 22 08:23:24 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!tsato From: tsato@delphi.com (Takeshi Sato) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug22.082324.7707@delphi.com> Date: Mon, 22 Aug 1994 08:23:24 GMT References: <1994Aug17.175724.2539@panix.com> <1994Aug19.184624.3644@cmu.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Aug19.184624.3644@cmu.edu>, tlopez@cmu.edu (Tobias López) 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. -- Takeshi Sato -- Delphi Internet Services "Extraordinary claims require extraordinary spectra."