From efournier@uni-hamburg.de Fri Sep 01 03:01:13 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!efournier From: efournier@uni-hamburg.de (Emi Fournier) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep01.030113.4797@uni-hamburg.de> Date: Fri, 01 Sep 1995 03:01:13 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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? -- Emi Fournier Hayes Optima 288 @ 28,800 bps "A soul is not exclusive to biology." From frobertson@kth.se Fri Sep 01 11:40:13 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!frobertson From: frobertson@kth.se (Fiona Robertson) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep01.114013.6856@kth.se> Date: Fri, 01 Sep 1995 11:40:13 GMT References: <1995Sep01.030113.4797@uni-hamburg.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep01.030113.4797@uni-hamburg.de>, efournier@uni-hamburg.de (Emi Fournier) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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. -- Fiona Robertson "Hold for relay." Atari Falcon 030 / AmigaOS 3.1 From mgonzalez@ox.ac.uk Sat Sep 02 20:30:13 1995 Path: ashpoly!cascade!mxgate!coyoacan!ox!mgonzalez From: mgonzalez@ox.ac.uk (Mei González) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep02.203013.1965@ox.ac.uk> Date: Sat, 02 Sep 1995 20:30:13 GMT References: <1995Sep01.030113.4797@uni-hamburg.de> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep01.030113.4797@uni-hamburg.de>, efournier@uni-hamburg.de (Emi Fournier) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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. -- Mei González "Marcus is not one man." PC-9821Ap2 (NEC) / TOS 4.04 From gdubois@ox.ac.uk Sat Sep 02 22:27:13 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!gdubois From: gdubois@ox.ac.uk (Graham Dubois) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep02.222713.8114@ox.ac.uk> Date: Sat, 02 Sep 1995 22:27:13 GMT References: <1995Sep01.030113.4797@uni-hamburg.de> <1995Sep02.203013.1965@ox.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep02.203013.1965@ox.ac.uk>, mgonzalez@ox.ac.uk (Mei González) 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. -- Graham Dubois Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------ From kgarcia@netcom.com Sun Sep 03 04:14:13 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!kgarcia From: kgarcia@netcom.com (Kirsty García) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Sep03.041413.7871@netcom.com> Date: Sun, 03 Sep 1995 04:14:13 GMT References: <1995Sep01.030113.4797@uni-hamburg.de> <1995Sep02.203013.1965@ox.ac.uk> <1995Sep02.222713.8114@ox.ac.uk> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep02.222713.8114@ox.ac.uk>, gdubois@ox.ac.uk (Graham Dubois) 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. -- Kirsty García *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0