From lchoi@kth.se Wed May 01 06:42:55 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!lchoi From: lchoi@kth.se (Liam Choi) Newsgroups: comp.dsp Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May01.064255.2935@kth.se> Date: Wed, 01 May 1996 06:42:55 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] 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. MATLAB script available upon request via email. -- Liam Choi Hayes Optima 288 @ ISDN 64k bps "Marcus is not one man." From npark@u-tokyo.ac.jp Thu May 02 15:16:55 1996 Path: ashpoly!cascade!bigsur!u-tokyo!npark From: npark@u-tokyo.ac.jp (Nadia Park) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May02.151655.1312@u-tokyo.ac.jp> Date: Thu, 02 May 1996 15:16:55 GMT References: <1996May01.064255.2935@kth.se> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996May01.064255.2935@kth.se>, lchoi@kth.se (Liam Choi) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Nadia Park Zyxel U-1496E @ 9600 Telebit bps "When every node is whole, the channel opens." From dgarcia@cam.ac.uk Fri May 03 15:21:55 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!dgarcia From: dgarcia@cam.ac.uk (Dong-hyun García) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May03.152155.6602@cam.ac.uk> Date: Fri, 03 May 1996 15:21:55 GMT References: <1996May01.064255.2935@kth.se> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996May01.064255.2935@kth.se>, lchoi@kth.se (Liam Choi) 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. -- Dong-hyun García Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------ From pramirez@cmu.edu Sat May 04 17:41:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!pramirez From: pramirez@cmu.edu (Pavel Ramírez) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996May04.174155.7530@cmu.edu> Date: Sat, 04 May 1996 17:41:55 GMT References: <1996May01.064255.2935@kth.se> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996May01.064255.2935@kth.se>, lchoi@kth.se (Liam Choi) 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. -- Pavel Ramírez Tape trading list upon request. SASE required for international mail.