From enakamura@berkeley.edu Thu Mar 02 20:56:24 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!enakamura From: enakamura@berkeley.edu (Emi Nakamura) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar02.205624.2413@berkeley.edu> Date: Thu, 02 Mar 1995 20:56:24 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. 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 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? -- Emi Nakamura | enakamura@berkeley.edu PGP Key fingerprint: F274 B88F A562 2F57 "Keep the channels open." From dnakamura@demon.co.uk Sat Mar 04 08:07:24 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!dnakamura From: dnakamura@demon.co.uk (Dave Nakamura) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar04.080724.6082@demon.co.uk> Date: Sat, 04 Mar 1995 08:07:24 GMT References: <1995Mar02.205624.2413@berkeley.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar02.205624.2413@berkeley.edu>, enakamura@berkeley.edu (Emi Nakamura) 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. -- Dave Nakamura *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0