From mkowalski@pacbell.net Tue Apr 26 07:52:43 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!mkowalski From: mkowalski@pacbell.net (Mei Kowalski) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr26.075243.8642@pacbell.net> Date: Tue, 26 Apr 1994 07:52:43 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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? -- Mei Kowalski -- Pacific Bell Internet Services "Marcus is not one man." From atakahashi@kiae.su Wed Apr 27 18:14:43 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!atakahashi From: atakahashi@kiae.su (Anja Takahashi) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr27.181443.8633@kiae.su> Date: Wed, 27 Apr 1994 18:14:43 GMT References: <1994Apr26.075243.8642@pacbell.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr26.075243.8642@pacbell.net>, mkowalski@pacbell.net (Mei Kowalski) 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. -- Anja Takahashi Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From sdubois@stanford.edu Thu Apr 28 03:13:43 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!sdubois From: sdubois@stanford.edu (Seo-yeon Dubois) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr28.031343.5200@stanford.edu> Date: Thu, 28 Apr 1994 03:13:43 GMT References: <1994Apr26.075243.8642@pacbell.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Apr26.075243.8642@pacbell.net>, mkowalski@pacbell.net (Mei Kowalski) 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. -- Seo-yeon Dubois SupraFAXModem 28.8 @ 19,200 bps "Measuring a record you own is listening, not piracy."