From slopez@u-tokyo.ac.jp Sun Jun 12 11:27:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!slopez From: slopez@u-tokyo.ac.jp (Sven López) Newsgroups: comp.dsp Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jun12.112703.7814@u-tokyo.ac.jp> Date: Sun, 12 Jun 1994 11:27:03 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] 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. 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? -- Sven López "They will send a copy in my place." Pentium 90 (OS/2 Warp) / TOS 4.04 From jramirez@u-tokyo.ac.jp Mon Jun 13 03:13:03 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!jramirez From: jramirez@u-tokyo.ac.jp (Jen Ramírez) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jun13.031303.7736@u-tokyo.ac.jp> Date: Mon, 13 Jun 1994 03:13:03 GMT References: <1994Jun12.112703.7814@u-tokyo.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jun12.112703.7814@u-tokyo.ac.jp>, slopez@u-tokyo.ac.jp (Sven López) 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. -- Jen Ramírez | jramirez@u-tokyo.ac.jp PGP Key fingerprint: 35FF 291E 5979 198D "Keep the channels open." From hsato@cmu.edu Tue Jun 14 07:35:03 1994 Path: ashpoly!cascade!bigsur!cmu!hsato From: hsato@cmu.edu (Hana Sato) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jun14.073503.9263@cmu.edu> Date: Tue, 14 Jun 1994 07:35:03 GMT References: <1994Jun12.112703.7814@u-tokyo.ac.jp> <1994Jun13.031303.7736@u-tokyo.ac.jp> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jun13.031303.7736@u-tokyo.ac.jp>, jramirez@u-tokyo.ac.jp (Jen Ramírez) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Hana Sato | hsato@cmu.edu PGP Key fingerprint: E8C9 E976 8FB2 2907 "Keep the channels open."