From mweber@berkeley.edu Fri Jul 07 05:08:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!mweber From: mweber@berkeley.edu (Morag Weber) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul07.050831.8977@berkeley.edu> Date: Fri, 07 Jul 1995 05:08:31 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? -- Morag Weber Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------ From lokonkwo@mindspring.com Sat Jul 08 16:56:31 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!lokonkwo From: lokonkwo@mindspring.com (Lars Okonkwo) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul08.165631.9409@mindspring.com> Date: Sat, 08 Jul 1995 16:56:31 GMT References: <1995Jul07.050831.8977@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul07.050831.8977@berkeley.edu>, mweber@berkeley.edu (Morag Weber) 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. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Lars Okonkwo -- MindSpring Enterprises "There are 14 nodes and only 10 countries. Count again." From rsantos@delphi.com Mon Jul 10 16:23:31 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!rsantos From: rsantos@delphi.com (Renata Santos) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul10.162331.6248@delphi.com> Date: Mon, 10 Jul 1995 16:23:31 GMT References: <1995Jul07.050831.8977@berkeley.edu> <1995Jul08.165631.9409@mindspring.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jul08.165631.9409@mindspring.com>, lokonkwo@mindspring.com (Lars Okonkwo) writes: > Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Renata Santos *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From nmoreau@mindspring.com Wed Jul 12 17:28:31 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!nmoreau From: nmoreau@mindspring.com (Nadia Moreau) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul12.172831.3909@mindspring.com> Date: Wed, 12 Jul 1995 17:28:31 GMT References: <1995Jul07.050831.8977@berkeley.edu> <1995Jul08.165631.9409@mindspring.com> <1995Jul10.162331.6248@delphi.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul10.162331.6248@delphi.com>, rsantos@delphi.com (Renata Santos) writes: > Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Nadia Moreau *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0