From skarlsson@purdue.edu Mon Mar 07 23:29:53 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!skarlsson From: skarlsson@purdue.edu (Sergei Karlsson) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Mar07.232953.1851@purdue.edu> Date: Mon, 07 Mar 1994 23:29:53 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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. -- Sergei Karlsson Tape trading list upon request. SASE required for international mail. From akang@stanford.edu Wed Mar 09 11:45:53 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!akang From: akang@stanford.edu (Anja Kang) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Mar09.114553.5935@stanford.edu> Date: Wed, 09 Mar 1994 11:45:53 GMT References: <1994Mar07.232953.1851@purdue.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Mar07.232953.1851@purdue.edu>, skarlsson@purdue.edu (Sergei Karlsson) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- === Anja Kang === Dept of Electrical Engineering, Stanford University Computer Systems Lab "The carrier frequency does not drift by accident." From nkarlsson@mit.edu Thu Mar 10 14:58:53 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!nkarlsson From: nkarlsson@mit.edu (Nadia Karlsson) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Mar10.145853.4650@mit.edu> Date: Thu, 10 Mar 1994 14:58:53 GMT References: <1994Mar07.232953.1851@purdue.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar07.232953.1851@purdue.edu>, skarlsson@purdue.edu (Sergei Karlsson) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Nadia Karlsson *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From sstewart@illinois.edu Fri Mar 11 19:59:53 1994 Path: ashpoly!cascade!mxgate!coyoacan!illinois!sstewart From: sstewart@illinois.edu (Sergei Stewart) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Mar11.195953.7682@illinois.edu> Date: Fri, 11 Mar 1994 19:59:53 GMT References: <1994Mar07.232953.1851@purdue.edu> <1994Mar09.114553.5935@stanford.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Mar09.114553.5935@stanford.edu>, akang@stanford.edu (Anja Kang) 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. -- Sergei Stewart Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign. ------------------------------------------------------------