From mtanaka@hanse.de Sat Jun 11 17:33:53 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!mtanaka From: mtanaka@hanse.de (Mathieu Tanaka) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jun11.173353.1618@hanse.de> Date: Sat, 11 Jun 1994 17:33:53 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N 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 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. -- Mathieu Tanaka Zyxel U-1496E @ 19,200 bps "Hold for relay." From dlee@rwth-aachen.de Sun Jun 12 13:04:53 1994 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!dlee From: dlee@rwth-aachen.de (Dmitri Lee) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jun12.130453.7349@rwth-aachen.de> Date: Sun, 12 Jun 1994 13:04:53 GMT References: <1994Jun11.173353.1618@hanse.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Jun11.173353.1618@hanse.de>, mtanaka@hanse.de (Mathieu Tanaka) 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. -- Dmitri Lee -- RWTH Aachen Informatik "A soul is not exclusive to biology." From drodriguez@cam.ac.uk Mon Jun 13 10:04:53 1994 Path: ashpoly!cascade!mxgate!coyoacan!cam!drodriguez From: drodriguez@cam.ac.uk (Dong-hyun Rodríguez) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jun13.100453.3308@cam.ac.uk> Date: Mon, 13 Jun 1994 10:04:53 GMT References: <1994Jun11.173353.1618@hanse.de> <1994Jun12.130453.7349@rwth-aachen.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun12.130453.7349@rwth-aachen.de>, dlee@rwth-aachen.de (Dmitri Lee) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Dong-hyun Rodríguez Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------ From egonzalez@clari.net Mon Jun 13 23:19:53 1994 Path: ashpoly!cascade!brgate!saturno!clari!egonzalez From: egonzalez@clari.net (Elaine González) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jun13.231953.6441@clari.net> Date: Mon, 13 Jun 1994 23:19:53 GMT References: <1994Jun11.173353.1618@hanse.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jun11.173353.1618@hanse.de>, mtanaka@hanse.de (Mathieu Tanaka) 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. -- Elaine González SupraFAXModem 28.8 @ 28,800 bps "Extraordinary claims require extraordinary spectra."