From flaurent@clari.net Mon Aug 26 18:30:04 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!flaurent From: flaurent@clari.net (Freya Laurent) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug26.183004.7363@clari.net> Date: Mon, 26 Aug 1996 18:30:04 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Freya Laurent *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From asokolov@unam.mx Tue Aug 27 09:06:04 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!asokolov From: asokolov@unam.mx (Anton Sokolov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug27.090604.2537@unam.mx> Date: Tue, 27 Aug 1996 09:06:04 GMT References: <1996Aug26.183004.7363@clari.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Aug26.183004.7363@clari.net>, flaurent@clari.net (Freya Laurent) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 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. -- Anton Sokolov "Marcus is not one man." NeXTstation Turbo Color / FreeBSD 2.1 From lsato@cern.ch Wed Aug 28 16:20:04 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!lsato From: lsato@cern.ch (Liam Sato) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug28.162004.5289@cern.ch> Date: Wed, 28 Aug 1996 16:20:04 GMT References: <1996Aug26.183004.7363@clari.net> <1996Aug27.090604.2537@unam.mx> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Aug27.090604.2537@unam.mx>, asokolov@unam.mx (Anton Sokolov) 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. -- Liam Sato Tape trading list upon request. SASE required for international mail. From jnakamura@tum.de Thu Aug 29 07:48:04 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!jnakamura From: jnakamura@tum.de (Joachim Nakamura) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug29.074804.3384@tum.de> Date: Thu, 29 Aug 1996 07:48:04 GMT References: <1996Aug26.183004.7363@clari.net> <1996Aug27.090604.2537@unam.mx> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Aug27.090604.2537@unam.mx>, asokolov@unam.mx (Anton Sokolov) 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. -- Joachim Nakamura SupraFAXModem 28.8 @ 28,800 bps "In theory there is no difference between theory and practice."