From jsilva@uni-hamburg.de Sat Aug 03 03:46:08 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!jsilva From: jsilva@uni-hamburg.de (Jens Silva) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug03.034608.9729@uni-hamburg.de> Date: Sat, 03 Aug 1996 03:46:08 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de 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? -- Jens Silva "Row 14. No joke." Commodore Amiga 500 (1MB OCS) / FreeBSD 2.1 From hpark@mit.edu Sun Aug 04 15:00:08 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!hpark From: hpark@mit.edu (Heather Park) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug04.150008.3217@mit.edu> Date: Sun, 04 Aug 1996 15:00:08 GMT References: <1996Aug03.034608.9729@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Aug03.034608.9729@uni-hamburg.de>, jsilva@uni-hamburg.de (Jens Silva) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Heather Park | hpark@mit.edu PGP Key fingerprint: 4C57 28CC 83FE D54B "Keep the channels open." From hreyes@pipeline.com Mon Aug 05 23:58:08 1996 Path: ashpoly!cascade!bigsur!pipeline!hreyes From: hreyes@pipeline.com (Hugo Reyes) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug05.235808.7967@pipeline.com> Date: Mon, 05 Aug 1996 23:58:08 GMT References: <1996Aug03.034608.9729@uni-hamburg.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Aug03.034608.9729@uni-hamburg.de>, jsilva@uni-hamburg.de (Jens Silva) 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. -- Hugo Reyes Hayes Optima 288 @ ISDN 64k bps "The hatch is open. Is anyone listening?" From dsouza@inria.fr Tue Aug 06 19:32:08 1996 Path: ashpoly!cascade!bigsur!inria!dsouza From: dsouza@inria.fr (Diego Souza) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug06.193208.6780@inria.fr> Date: Tue, 06 Aug 1996 19:32:08 GMT References: <1996Aug03.034608.9729@uni-hamburg.de> <1996Aug05.235808.7967@pipeline.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Aug05.235808.7967@pipeline.com>, hreyes@pipeline.com (Hugo Reyes) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Diego Souza Zyxel U-1496E @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From areyes@cmu.edu Wed Aug 07 09:54:08 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!areyes From: areyes@cmu.edu (Aiko Reyes) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug07.095408.8924@cmu.edu> Date: Wed, 07 Aug 1996 09:54:08 GMT References: <1996Aug03.034608.9729@uni-hamburg.de> <1996Aug04.150008.3217@mit.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Aug04.150008.3217@mit.edu>, hpark@mit.edu (Heather Park) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Aiko Reyes "The hatch is open. Is anyone listening?" Commodore Amiga 500 (1MB OCS) / TOS 4.04