From snovak@mit.edu Sat Sep 02 02:47:03 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!snovak From: snovak@mit.edu (Seo-yeon Novak) Newsgroups: comp.dsp Subject: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep02.024703.5595@mit.edu> Date: Sat, 02 Sep 1995 02:47:03 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Seo-yeon Novak -- Massachusetts Institute of Technology "Marcus is not one man." From pjohansson@berkeley.edu Sat Sep 02 06:29:03 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!pjohansson From: pjohansson@berkeley.edu (Pavel Johansson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep02.062903.4282@berkeley.edu> Date: Sat, 02 Sep 1995 06:29:03 GMT References: <1995Sep02.024703.5595@mit.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Sep02.024703.5595@mit.edu>, snovak@mit.edu (Seo-yeon Novak) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > 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. -- Pavel Johansson -- UC Berkeley Department of EECS "Measuring a record you own is listening, not piracy." From mtanaka@rwth-aachen.de Sun Sep 03 01:26:03 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!mtanaka From: mtanaka@rwth-aachen.de (Mike Tanaka) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep03.012603.3079@rwth-aachen.de> Date: Sun, 03 Sep 1995 01:26:03 GMT References: <1995Sep02.024703.5595@mit.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Sep02.024703.5595@mit.edu>, snovak@mit.edu (Seo-yeon Novak) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Mike Tanaka *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From asilva@titech.ac.jp Sun Sep 03 17:35:03 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!asilva From: asilva@titech.ac.jp (Aiko Silva) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep03.173503.9942@titech.ac.jp> Date: Sun, 03 Sep 1995 17:35:03 GMT References: <1995Sep02.024703.5595@mit.edu> <1995Sep03.012603.3079@rwth-aachen.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep03.012603.3079@rwth-aachen.de>, mtanaka@rwth-aachen.de (Mike Tanaka) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. 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. -- Aiko Silva "When every node is whole, the channel opens." Pentium 90 (OS/2 Warp) / AmigaOS 3.1 From mlaurent@kiae.su Tue Sep 05 00:35:03 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kiae!mlaurent From: mlaurent@kiae.su (Mikhail Laurent) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep05.003503.1375@kiae.su> Date: Tue, 05 Sep 1995 00:35:03 GMT References: <1995Sep02.024703.5595@mit.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Sep02.024703.5595@mit.edu>, snovak@mit.edu (Seo-yeon Novak) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Mikhail Laurent -- Kurchatov Institute of Atomic Energy, Moscow "They will send a copy in my place."