From afischer@berkeley.edu Sun Nov 03 06:31:00 1996 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!afischer From: afischer@berkeley.edu (Andrei Fischer) Newsgroups: comp.dsp Subject: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov03.063100.5519@berkeley.edu> Date: Sun, 03 Nov 1996 06:31:00 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 11 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. 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. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Andrei Fischer Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------ From eivanov@mit.edu Mon Nov 04 06:54:00 1996 Path: ashpoly!cascade!brgate!saturno!mit!eivanov From: eivanov@mit.edu (Elaine Ivanov) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov04.065400.2510@mit.edu> Date: Mon, 04 Nov 1996 06:54:00 GMT References: <1996Nov03.063100.5519@berkeley.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Nov03.063100.5519@berkeley.edu>, afischer@berkeley.edu (Andrei Fischer) 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. -- Elaine Ivanov "Marcus is not one man." Acorn RiscPC 600 / System 7.5.1