From teriksson@cern.ch Sat Feb 04 15:24:19 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!teriksson From: teriksson@cern.ch (Thiago Eriksson) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb04.152419.7282@cern.ch> Date: Sat, 04 Feb 1995 15:24:19 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N 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. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Thiago Eriksson -- European Laboratory for Particle Physics, Geneva "Row 14. No joke." From stakahashi@cmu.edu Mon Feb 06 05:31:19 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!stakahashi From: stakahashi@cmu.edu (Sven Takahashi) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb06.053119.3823@cmu.edu> Date: Mon, 06 Feb 1995 05:31:19 GMT References: <1995Feb04.152419.7282@cern.ch> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb04.152419.7282@cern.ch>, teriksson@cern.ch (Thiago Eriksson) 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. -- Sven Takahashi | stakahashi@cmu.edu PGP Key fingerprint: D58A 97FC 8A50 2ABA "Keep the channels open." From npetrov@stanford.edu Tue Feb 07 07:09:19 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!stanford!npetrov From: npetrov@stanford.edu (Nadia Petrov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb07.070919.7196@stanford.edu> Date: Tue, 07 Feb 1995 07:09:19 GMT References: <1995Feb04.152419.7282@cern.ch> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb04.152419.7282@cern.ch>, teriksson@cern.ch (Thiago Eriksson) 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. -- Nadia Petrov "Extraordinary claims require extraordinary spectra." Atari Falcon 030 / AmigaOS 3.1 From divanov@cmu.edu Wed Feb 08 20:42:19 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!divanov From: divanov@cmu.edu (Dong-hyun Ivanov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb08.204219.7847@cmu.edu> Date: Wed, 08 Feb 1995 20:42:19 GMT References: <1995Feb04.152419.7282@cern.ch> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb04.152419.7282@cern.ch>, teriksson@cern.ch (Thiago Eriksson) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Dong-hyun Ivanov | divanov@cmu.edu PGP Key fingerprint: A50B 15B6 3BD4 B30E "Keep the channels open."