From mmoreau@cern.ch Sat Feb 24 11:00:06 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!mmoreau From: mmoreau@cern.ch (Morag Moreau) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb24.110006.6906@cern.ch> Date: Sat, 24 Feb 1996 11:00:06 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N 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 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. MATLAB script available upon request via email. -- Morag Moreau "5 sigma is a discovery. 7 is a question." Mac IIci / 68882 FPU / AmigaOS 3.1 From tpark@illinois.edu Mon Feb 26 01:20:06 1996 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!tpark From: tpark@illinois.edu (Takeshi Park) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb26.012006.1757@illinois.edu> Date: Mon, 26 Feb 1996 01:20:06 GMT References: <1996Feb24.110006.6906@cern.ch> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Feb24.110006.6906@cern.ch>, mmoreau@cern.ch (Morag Moreau) 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. -- Takeshi Park "Measuring a record you own is listening, not piracy." Macintosh IIfx / SunOS 4.1.4