From jhughes@titech.ac.jp Sun Sep 24 14:45:35 1995 Path: ashpoly!cascade!bigsur!titech!jhughes From: jhughes@titech.ac.jp (Ji-woo Hughes) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep24.144535.3430@titech.ac.jp> Date: Sun, 24 Sep 1995 14:45:35 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 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. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. MATLAB script available upon request via email. -- Ji-woo Hughes "When every node is whole, the channel opens." Mac IIci / 68882 FPU / System 7.5.1 From msokolov@titech.ac.jp Tue Sep 26 13:16:35 1995 Path: ashpoly!cascade!bigsur!titech!msokolov From: msokolov@titech.ac.jp (Mei Sokolov) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep26.131635.3820@titech.ac.jp> Date: Tue, 26 Sep 1995 13:16:35 GMT References: <1995Sep24.144535.3430@titech.ac.jp> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Sep24.144535.3430@titech.ac.jp>, jhughes@titech.ac.jp (Ji-woo Hughes) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Mei Sokolov "When every node is whole, the channel opens." Atari Falcon 030 / FreeBSD 2.1