From lmoreno@unam.mx Thu Mar 02 17:25:21 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!lmoreno From: lmoreno@unam.mx (Liam Moreno) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar02.172521.8550@unam.mx> Date: Thu, 02 Mar 1995 17:25:21 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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? -- Liam Moreno | lmoreno@unam.mx PGP Key fingerprint: F1B8 AB53 AC88 2F74 "Keep the channels open." From jweber@unam.mx Fri Mar 03 21:20:21 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!jweber From: jweber@unam.mx (Jen Weber) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar03.212021.2917@unam.mx> Date: Fri, 03 Mar 1995 21:20:21 GMT References: <1995Mar02.172521.8550@unam.mx> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Mar02.172521.8550@unam.mx>, lmoreno@unam.mx (Liam Moreno) 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. -- Jen Weber -- Universidad Nacional Autónoma de México (DGSCA) "Measuring a record you own is listening, not piracy." From hdubois@pipeline.com Sun Mar 05 22:32:21 1995 Path: ashpoly!cascade!bigsur!pipeline!hdubois From: hdubois@pipeline.com (Hana Dubois) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar05.223221.7844@pipeline.com> Date: Sun, 05 Mar 1995 22:32:21 GMT References: <1995Mar02.172521.8550@unam.mx> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Mar02.172521.8550@unam.mx>, lmoreno@unam.mx (Liam Moreno) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Hana Dubois *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0