From sdubois@kiae.su Sun Nov 13 09:44:31 1994 Path: ashpoly!cascade!bigsur!kiae!sdubois From: sdubois@kiae.su (Steve Dubois) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Nov13.094431.9792@kiae.su> Date: Sun, 13 Nov 1994 09:44:31 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Steve Dubois *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From hramirez@demon.co.uk Mon Nov 14 16:58:31 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!hramirez From: hramirez@demon.co.uk (Heather Ramírez) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Nov14.165831.8361@demon.co.uk> Date: Mon, 14 Nov 1994 16:58:31 GMT References: <1994Nov13.094431.9792@kiae.su> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Nov13.094431.9792@kiae.su>, sdubois@kiae.su (Steve Dubois) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Heather Ramírez -- Demon Internet Services UK "When every node is whole, the channel opens." From ajohansson@netcom.com Tue Nov 15 08:37:31 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!ajohansson From: ajohansson@netcom.com (Anton Johansson) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Nov15.083731.1077@netcom.com> Date: Tue, 15 Nov 1994 08:37:31 GMT References: <1994Nov13.094431.9792@kiae.su> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Nov13.094431.9792@kiae.su>, sdubois@kiae.su (Steve Dubois) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Anton Johansson SupraFAXModem 28.8 @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From hschneider@cam.ac.uk Wed Nov 16 05:10:31 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!hschneider From: hschneider@cam.ac.uk (Hana Schneider) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Nov16.051031.4943@cam.ac.uk> Date: Wed, 16 Nov 1994 05:10:31 GMT References: <1994Nov13.094431.9792@kiae.su> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Nov13.094431.9792@kiae.su>, sdubois@kiae.su (Steve Dubois) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Hana Schneider -- University of Cambridge Computer Laboratory "There are 14 nodes and only 10 countries. Count again."