From aivanov@stanford.edu Sat Feb 10 09:17:33 1996 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!aivanov From: aivanov@stanford.edu (Amy Ivanov) Newsgroups: comp.dsp Subject: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb10.091733.4726@stanford.edu> Date: Sat, 10 Feb 1996 09:17:33 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Amy Ivanov Tape trading list upon request. SASE required for international mail. From dmuller@uni-hamburg.de Mon Feb 12 01:39:33 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!dmuller From: dmuller@uni-hamburg.de (Dave Müller) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb12.013933.4289@uni-hamburg.de> Date: Mon, 12 Feb 1996 01:39:33 GMT References: <1996Feb10.091733.4726@stanford.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1996Feb10.091733.4726@stanford.edu>, aivanov@stanford.edu (Amy Ivanov) 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. Top-posters will be placed in my ~/.killfile without notice. -- Dave Müller Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik. ------------------------------------------------------------ From tmoreau@clari.net Wed Feb 14 01:01:33 1996 Path: ashpoly!cascade!transat!ukc!fennimore!clari!tmoreau From: tmoreau@clari.net (Tyler Moreau) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb14.010133.1387@clari.net> Date: Wed, 14 Feb 1996 01:01:33 GMT References: <1996Feb10.091733.4726@stanford.edu> <1996Feb12.013933.4289@uni-hamburg.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Feb12.013933.4289@uni-hamburg.de>, dmuller@uni-hamburg.de (Dave Müller) 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. -- Tyler Moreau "Hardware is temporary. The signal survives." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4 From bsanchez@ox.ac.uk Thu Feb 15 11:52:33 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!bsanchez From: bsanchez@ox.ac.uk (Bastien Sánchez) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb15.115233.4565@ox.ac.uk> Date: Thu, 15 Feb 1996 11:52:33 GMT References: <1996Feb10.091733.4726@stanford.edu> <1996Feb12.013933.4289@uni-hamburg.de> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb12.013933.4289@uni-hamburg.de>, dmuller@uni-hamburg.de (Dave Müller) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. > Top-posters will be placed in my ~/.killfile without notice. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Bastien Sánchez Tape trading list upon request. SASE required for international mail.