From mramirez@illinois.edu Sun Apr 09 17:19:12 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!mramirez From: mramirez@illinois.edu (Mateo Ramírez) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr09.171912.2833@illinois.edu> Date: Sun, 09 Apr 1995 17:19:12 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. 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? -- Mateo Ramírez | mramirez@illinois.edu PGP Key fingerprint: 9DE5 4EE3 9712 CEFA "Keep the channels open." From alopez@clari.net Tue Apr 11 10:39:12 1995 Path: ashpoly!cascade!mxgate!coyoacan!clari!alopez From: alopez@clari.net (Andrei López) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr11.103912.2360@clari.net> Date: Tue, 11 Apr 1995 10:39:12 GMT References: <1995Apr09.171912.2833@illinois.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Apr09.171912.2833@illinois.edu>, mramirez@illinois.edu (Mateo Ramírez) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Andrei López *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0