From msato@netcom.com Mon Jan 08 18:42:11 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!msato From: msato@netcom.com (Morag Sato) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan08.184211.6362@netcom.com> Date: Mon, 08 Jan 1996 18:42:11 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 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. -- Morag Sato *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From cgonzalez@tum.de Tue Jan 09 19:21:11 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!cgonzalez From: cgonzalez@tum.de (Camila González) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan09.192111.7232@tum.de> Date: Tue, 09 Jan 1996 19:21:11 GMT References: <1996Jan08.184211.6362@netcom.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Jan08.184211.6362@netcom.com>, msato@netcom.com (Morag Sato) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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. PGP Public key available via finger or upon request. -- Camila González Zyxel U-1496E @ 33,600 bps "We don't sign stars. We build them." From gsuzuki@titech.ac.jp Wed Jan 10 20:41:11 1996 Path: ashpoly!cascade!brgate!saturno!titech!gsuzuki From: gsuzuki@titech.ac.jp (Göran Suzuki) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan10.204111.2208@titech.ac.jp> Date: Wed, 10 Jan 1996 20:41:11 GMT References: <1996Jan08.184211.6362@netcom.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jan08.184211.6362@netcom.com>, msato@netcom.com (Morag Sato) 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. -- === Göran Suzuki === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "There are 14 nodes and only 10 countries. Count again."