From sivanov@unam.mx Sun Nov 24 17:06:57 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!sivanov From: sivanov@unam.mx (Sergei Ivanov) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov24.170657.1953@unam.mx> Date: Sun, 24 Nov 1996 17:06:57 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- === Sergei Ivanov === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "We don't sign stars. We build them." From rrobertson@cmu.edu Tue Nov 26 15:02:57 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!rrobertson From: rrobertson@cmu.edu (Rodrigo Robertson) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov26.150257.5535@cmu.edu> Date: Tue, 26 Nov 1996 15:02:57 GMT References: <1996Nov24.170657.1953@unam.mx> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Nov24.170657.1953@unam.mx>, sivanov@unam.mx (Sergei Ivanov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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. -- Rodrigo Robertson -- Carnegie Mellon University School of CS "We don't sign stars. We build them." From jtanaka@kiae.su Wed Nov 27 15:29:57 1996 Path: ashpoly!cascade!mxgate!coyoacan!kiae!jtanaka From: jtanaka@kiae.su (Jens Tanaka) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov27.152957.2585@kiae.su> Date: Wed, 27 Nov 1996 15:29:57 GMT References: <1996Nov24.170657.1953@unam.mx> <1996Nov26.150257.5535@cmu.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Nov26.150257.5535@cmu.edu>, rrobertson@cmu.edu (Rodrigo Robertson) 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. -- Jens Tanaka -- Kurchatov Institute of Atomic Energy, Moscow "They will send a copy in my place." From abrennan@kiae.su Thu Nov 28 11:12:57 1996 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!abrennan From: abrennan@kiae.su (Aiko Brennan) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov28.111257.9810@kiae.su> Date: Thu, 28 Nov 1996 11:12:57 GMT References: <1996Nov24.170657.1953@unam.mx> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1996Nov24.170657.1953@unam.mx>, sivanov@unam.mx (Sergei Ivanov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Aiko Brennan === Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow "Hold for relay." From fstewart@tum.de Thu Nov 28 12:59:57 1996 Path: ashpoly!cascade!mxgate!coyoacan!tum!fstewart From: fstewart@tum.de (Fiona Stewart) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov28.125957.4247@tum.de> Date: Thu, 28 Nov 1996 12:59:57 GMT References: <1996Nov24.170657.1953@unam.mx> <1996Nov26.150257.5535@cmu.edu> <1996Nov27.152957.2585@kiae.su> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Nov27.152957.2585@kiae.su>, jtanaka@kiae.su (Jens Tanaka) 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. -- Fiona Stewart Zyxel U-1496E @ 28,800 bps "There are 14 nodes and only 10 countries. Count again."