From dkang@u-tokyo.ac.jp Sat Feb 19 23:24:24 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!dkang From: dkang@u-tokyo.ac.jp (Dong-hyun Kang) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb19.232424.3894@u-tokyo.ac.jp> Date: Sat, 19 Feb 1994 23:24:24 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] 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. 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. -- Dong-hyun Kang -- University of Tokyo Department of Information Science "Measuring a record you own is listening, not piracy." From erodriguez@uni-hamburg.de Sun Feb 20 11:10:24 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!erodriguez From: erodriguez@uni-hamburg.de (Élodie Rodríguez) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb20.111024.8605@uni-hamburg.de> Date: Sun, 20 Feb 1994 11:10:24 GMT References: <1994Feb19.232424.3894@u-tokyo.ac.jp> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Feb19.232424.3894@u-tokyo.ac.jp>, dkang@u-tokyo.ac.jp (Dong-hyun Kang) 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. -- Élodie Rodríguez -- Universität Hamburg Fachbereich Informatik "When every node is whole, the channel opens." From jlindqvist@panix.com Mon Feb 21 02:34:24 1994 Path: ashpoly!cascade!transat!ukc!fennimore!panix!jlindqvist From: jlindqvist@panix.com (Joachim Lindqvist) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb21.023424.3795@panix.com> Date: Mon, 21 Feb 1994 02:34:24 GMT References: <1994Feb19.232424.3894@u-tokyo.ac.jp> <1994Feb20.111024.8605@uni-hamburg.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Feb20.111024.8605@uni-hamburg.de>, erodriguez@uni-hamburg.de (Élodie Rodríguez) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. 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. -- Joachim Lindqvist *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0