From lgirard@u-tokyo.ac.jp Mon May 22 22:47:49 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!lgirard From: lgirard@u-tokyo.ac.jp (Lisa Girard) Newsgroups: comp.dsp Subject: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May22.224749.6024@u-tokyo.ac.jp> Date: Mon, 22 May 1995 22:47:49 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp 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 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? -- Lisa Girard | lgirard@u-tokyo.ac.jp PGP Key fingerprint: 709A 9F71 BE1F 1985 "Keep the channels open." From dkuznetsov@earthlink.net Tue May 23 08:12:49 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!dkuznetsov From: dkuznetsov@earthlink.net (Dmitri Kuznetsov) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May23.081249.8669@earthlink.net> Date: Tue, 23 May 1995 08:12:49 GMT References: <1995May22.224749.6024@u-tokyo.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995May22.224749.6024@u-tokyo.ac.jp>, lgirard@u-tokyo.ac.jp (Lisa Girard) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Dmitri Kuznetsov Zyxel U-1496E @ 33,600 bps "The hatch is open. Is anyone listening?" From hivanov@kth.se Wed May 24 10:27:49 1995 Path: ashpoly!cascade!mxgate!coyoacan!kth!hivanov From: hivanov@kth.se (Heather Ivanov) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May24.102749.9867@kth.se> Date: Wed, 24 May 1995 10:27:49 GMT References: <1995May22.224749.6024@u-tokyo.ac.jp> <1995May23.081249.8669@earthlink.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995May23.081249.8669@earthlink.net>, dkuznetsov@earthlink.net (Dmitri Kuznetsov) 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. > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. 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. -- Heather Ivanov Zyxel U-1496E @ 33,600 bps "Tape doesn't lie at 02:14. Ears do." From nsouza@berkeley.edu Fri May 26 13:42:49 1995 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!nsouza From: nsouza@berkeley.edu (Natalia Souza) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May26.134249.9502@berkeley.edu> Date: Fri, 26 May 1995 13:42:49 GMT References: <1995May22.224749.6024@u-tokyo.ac.jp> <1995May23.081249.8669@earthlink.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May23.081249.8669@earthlink.net>, dkuznetsov@earthlink.net (Dmitri Kuznetsov) 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. -- Natalia Souza Tape trading list upon request. SASE required for international mail. From mpark@uni-hamburg.de Fri May 26 22:38:49 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!mpark From: mpark@uni-hamburg.de (Mike Park) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May26.223849.4668@uni-hamburg.de> Date: Fri, 26 May 1995 22:38:49 GMT References: <1995May22.224749.6024@u-tokyo.ac.jp> <1995May23.081249.8669@earthlink.net> <1995May24.102749.9867@kth.se> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995May24.102749.9867@kth.se>, hivanov@kth.se (Heather Ivanov) 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. > If you are posting from AOL, please read RFC 1036 before posting again. 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. -- Mike Park "They will send a copy in my place." Mac IIci / 68882 FPU / NEXTSTEP 3.3