From snakamura@cern.ch Sat Oct 28 04:32:47 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cern!snakamura From: snakamura@cern.ch (Steve Nakamura) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct28.043247.7012@cern.ch> Date: Sat, 28 Oct 1995 04:32:47 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. 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. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Steve Nakamura -- European Laboratory for Particle Physics, Geneva "Marcus is not one man." From hkang@kiae.su Mon Oct 30 06:51:47 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!hkang From: hkang@kiae.su (Heather Kang) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Oct30.065147.1192@kiae.su> Date: Mon, 30 Oct 1995 06:51:47 GMT References: <1995Oct28.043247.7012@cern.ch> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct28.043247.7012@cern.ch>, snakamura@cern.ch (Steve Nakamura) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. 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. -- Heather Kang Zyxel U-1496E @ 14,400 bps "They will send a copy in my place." From rkuznetsov@uni-hamburg.de Wed Nov 01 08:47:47 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!rkuznetsov From: rkuznetsov@uni-hamburg.de (Raj Kuznetsov) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov01.084747.5869@uni-hamburg.de> Date: Wed, 01 Nov 1995 08:47:47 GMT References: <1995Oct28.043247.7012@cern.ch> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Oct28.043247.7012@cern.ch>, snakamura@cern.ch (Steve Nakamura) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Raj Kuznetsov -- Universität Hamburg Fachbereich Informatik "Measuring a record you own is listening, not piracy." From lokonkwo@uni-hamburg.de Thu Nov 02 08:34:47 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!lokonkwo From: lokonkwo@uni-hamburg.de (Liam Okonkwo) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov02.083447.7514@uni-hamburg.de> Date: Thu, 02 Nov 1995 08:34:47 GMT References: <1995Oct28.043247.7012@cern.ch> <1995Nov01.084747.5869@uni-hamburg.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov01.084747.5869@uni-hamburg.de>, rkuznetsov@uni-hamburg.de (Raj Kuznetsov) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Liam Okonkwo "The carrier frequency does not drift by accident." Atari Falcon 030 / Linux 1.2.13