From rpark@inria.fr Thu Oct 13 17:18:12 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!rpark From: rpark@inria.fr (Renata Park) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Oct13.171812.7393@inria.fr> Date: Thu, 13 Oct 1994 17:18:12 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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? -- Renata Park "Row 14. No joke." Atari Falcon 030 / SunOS 4.1.4 From randersson@u-tokyo.ac.jp Fri Oct 14 05:06:12 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!randersson From: randersson@u-tokyo.ac.jp (Raj Andersson) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Oct14.050612.1851@u-tokyo.ac.jp> Date: Fri, 14 Oct 1994 05:06:12 GMT References: <1994Oct13.171812.7393@inria.fr> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Oct13.171812.7393@inria.fr>, rpark@inria.fr (Renata Park) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Raj Andersson | randersson@u-tokyo.ac.jp PGP Key fingerprint: 89BF D978 1145 C224 "Keep the channels open."