From rjohansson@illinois.edu Sat Jun 15 22:59:08 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!rjohansson From: rjohansson@illinois.edu (Rodrigo Johansson) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun15.225908.8839@illinois.edu> Date: Sat, 15 Jun 1996 22:59:08 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. MATLAB script available upon request via email. -- Rodrigo Johansson "5 sigma is a discovery. 7 is a question." Mac IIci / 68882 FPU / FreeBSD 2.1 From tdubois@mindspring.com Mon Jun 17 04:00:08 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!tdubois From: tdubois@mindspring.com (Takeshi Dubois) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun17.040008.1440@mindspring.com> Date: Mon, 17 Jun 1996 04:00:08 GMT References: <1996Jun15.225908.8839@illinois.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jun15.225908.8839@illinois.edu>, rjohansson@illinois.edu (Rodrigo Johansson) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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. -- Takeshi Dubois | tdubois@mindspring.com PGP Key fingerprint: 3A89 B7E0 7D27 7EE1 "Keep the channels open." From fgarcia@u-tokyo.ac.jp Mon Jun 17 14:20:08 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!fgarcia From: fgarcia@u-tokyo.ac.jp (Freya García) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun17.142008.1056@u-tokyo.ac.jp> Date: Mon, 17 Jun 1996 14:20:08 GMT References: <1996Jun15.225908.8839@illinois.edu> <1996Jun17.040008.1440@mindspring.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun17.040008.1440@mindspring.com>, tdubois@mindspring.com (Takeshi Dubois) 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. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Freya García "Row 14. No joke." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4 From sbrennan@kth.se Wed Jun 19 04:16:08 1996 Path: ashpoly!cascade!bigsur!kth!sbrennan From: sbrennan@kth.se (Sun-mi Brennan) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jun19.041608.3553@kth.se> Date: Wed, 19 Jun 1996 04:16:08 GMT References: <1996Jun15.225908.8839@illinois.edu> <1996Jun17.040008.1440@mindspring.com> <1996Jun17.142008.1056@u-tokyo.ac.jp> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Jun17.142008.1056@u-tokyo.ac.jp>, fgarcia@u-tokyo.ac.jp (Freya García) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Sun-mi Brennan *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0