From gsuzuki@purdue.edu Sat Jul 01 17:37:51 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!gsuzuki From: gsuzuki@purdue.edu (Graham Suzuki) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul01.173751.9530@purdue.edu> Date: Sat, 01 Jul 1995 17:37:51 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu 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. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Graham Suzuki | gsuzuki@purdue.edu PGP Key fingerprint: 56C9 B8F3 A0A8 9979 "Keep the channels open." From jmacdonald@mit.edu Sat Jul 01 19:55:51 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mit!jmacdonald From: jmacdonald@mit.edu (Julien MacDonald) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul01.195551.1188@mit.edu> Date: Sat, 01 Jul 1995 19:55:51 GMT References: <1995Jul01.173751.9530@purdue.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jul01.173751.9530@purdue.edu>, gsuzuki@purdue.edu (Graham Suzuki) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Julien MacDonald Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From hdubois@inria.fr Sun Jul 02 14:21:51 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!hdubois From: hdubois@inria.fr (Hana Dubois) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul02.142151.7929@inria.fr> Date: Sun, 02 Jul 1995 14:21:51 GMT References: <1995Jul01.173751.9530@purdue.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul01.173751.9530@purdue.edu>, gsuzuki@purdue.edu (Graham Suzuki) 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. -- Hana Dubois Zyxel U-1496E @ 28,800 bps "Measuring a record you own is listening, not piracy." From ksuzuki@cern.ch Tue Jul 04 14:03:51 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!ksuzuki From: ksuzuki@cern.ch (Katrin Suzuki) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul04.140351.4251@cern.ch> Date: Tue, 04 Jul 1995 14:03:51 GMT References: <1995Jul01.173751.9530@purdue.edu> <1995Jul01.195551.1188@mit.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Jul01.195551.1188@mit.edu>, jmacdonald@mit.edu (Julien MacDonald) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Katrin Suzuki "Extraordinary claims require extraordinary spectra." Commodore Amiga 500 (1MB OCS) / NEXTSTEP 3.3