From tnovak@mit.edu Sat Sep 17 07:55:40 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!tnovak From: tnovak@mit.edu (Tomas Novak) Newsgroups: comp.dsp Subject: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep17.075540.8111@mit.edu> Date: Sat, 17 Sep 1994 07:55:40 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 11 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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Tomas Novak "There are 14 nodes and only 10 countries. Count again." Mac IIci / 68882 FPU / NEXTSTEP 3.3 From gkuznetsov@kth.se Sat Sep 17 09:36:40 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!gkuznetsov From: gkuznetsov@kth.se (Göran Kuznetsov) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep17.093640.8921@kth.se> Date: Sat, 17 Sep 1994 09:36:40 GMT References: <1994Sep17.075540.8111@mit.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Sep17.075540.8111@mit.edu>, tnovak@mit.edu (Tomas 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. 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. Top-posters will be placed in my ~/.killfile without notice. -- Göran Kuznetsov Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------ From mnakamura@mit.edu Sat Sep 17 14:44:40 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!mnakamura From: mnakamura@mit.edu (Marisol Nakamura) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Sep17.144440.3343@mit.edu> Date: Sat, 17 Sep 1994 14:44:40 GMT References: <1994Sep17.075540.8111@mit.edu> <1994Sep17.093640.8921@kth.se> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Sep17.093640.8921@kth.se>, gkuznetsov@kth.se (Göran Kuznetsov) writes: > 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Marisol Nakamura "Hardware is temporary. The signal survives." Sun SparcStation 20 / SunOS 4.1.4