From nnakamura@uni-hamburg.de Thu Aug 22 15:11:11 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!nnakamura From: nnakamura@uni-hamburg.de (Natalia Nakamura) Newsgroups: comp.dsp Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug22.151111.1460@uni-hamburg.de> Date: Thu, 22 Aug 1996 15:11:11 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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? -- Natalia Nakamura "5 sigma is a discovery. 7 is a question." Amiga 1200 (Blizzard 030/50) / Linux 1.2.13 From alee@hanse.de Thu Aug 22 17:40:11 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!alee From: alee@hanse.de (Anja Lee) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug22.174011.8977@hanse.de> Date: Thu, 22 Aug 1996 17:40:11 GMT References: <1996Aug22.151111.1460@uni-hamburg.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Aug22.151111.1460@uni-hamburg.de>, nnakamura@uni-hamburg.de (Natalia Nakamura) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Anja Lee -- Hanse-Netzwerk Hamburg "Marcus is not one man." From amoreno@pacbell.net Sat Aug 24 10:33:11 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!amoreno From: amoreno@pacbell.net (Amy Moreno) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug24.103311.1327@pacbell.net> Date: Sat, 24 Aug 1996 10:33:11 GMT References: <1996Aug22.151111.1460@uni-hamburg.de> <1996Aug22.174011.8977@hanse.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Aug22.174011.8977@hanse.de>, alee@hanse.de (Anja Lee) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Amy Moreno -- Pacific Bell Internet Services "The carrier frequency does not drift by accident." From fmartinez@mit.edu Sun Aug 25 21:15:11 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!fmartinez From: fmartinez@mit.edu (Fiona Martínez) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug25.211511.5370@mit.edu> Date: Sun, 25 Aug 1996 21:15:11 GMT References: <1996Aug22.151111.1460@uni-hamburg.de> <1996Aug22.174011.8977@hanse.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Aug22.174011.8977@hanse.de>, alee@hanse.de (Anja Lee) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Fiona Martínez "Row 14. No joke." Amiga 3000T / NEXTSTEP 3.3 From alopez@pipeline.com Mon Aug 26 22:47:11 1996 Path: ashpoly!cascade!bigsur!pipeline!alopez From: alopez@pipeline.com (Aiko López) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Aug26.224711.4512@pipeline.com> Date: Mon, 26 Aug 1996 22:47:11 GMT References: <1996Aug22.151111.1460@uni-hamburg.de> <1996Aug22.174011.8977@hanse.de> <1996Aug24.103311.1327@pacbell.net> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Aug24.103311.1327@pacbell.net>, amoreno@pacbell.net (Amy Moreno) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. > If you are posting from AOL, please read RFC 1036 before posting again. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Aiko López "The hatch is open. Is anyone listening?" Pentium 90 (OS/2 Warp) / SunOS 4.1.4