From msanchez@delphi.com Mon Jul 04 22:28:30 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!msanchez From: msanchez@delphi.com (Mateo Sánchez) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jul04.222830.3705@delphi.com> Date: Mon, 04 Jul 1994 22:28:30 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. MATLAB script available upon request via email. -- Mateo Sánchez -- Delphi Internet Services "A soul is not exclusive to biology." From dnakamura@unam.mx Tue Jul 05 23:54:30 1994 Path: ashpoly!cascade!brgate!saturno!unam!dnakamura From: dnakamura@unam.mx (Dmitri Nakamura) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jul05.235430.6343@unam.mx> Date: Tue, 05 Jul 1994 23:54:30 GMT References: <1994Jul04.222830.3705@delphi.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jul04.222830.3705@delphi.com>, msanchez@delphi.com (Mateo Sánchez) writes: > 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. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Dmitri Nakamura *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From sweber@hanse.de Wed Jul 06 15:06:30 1994 Path: ashpoly!cascade!bigsur!hanse!sweber From: sweber@hanse.de (Steve Weber) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jul06.150630.7272@hanse.de> Date: Wed, 06 Jul 1994 15:06:30 GMT References: <1994Jul04.222830.3705@delphi.com> <1994Jul05.235430.6343@unam.mx> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jul05.235430.6343@unam.mx>, dnakamura@unam.mx (Dmitri Nakamura) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Steve Weber Zyxel U-1496E @ 9600 Telebit bps "The carrier frequency does not drift by accident." From blee@titech.ac.jp Wed Jul 06 17:51:30 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!blee From: blee@titech.ac.jp (Bastien Lee) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jul06.175130.5570@titech.ac.jp> Date: Wed, 06 Jul 1994 17:51:30 GMT References: <1994Jul04.222830.3705@delphi.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Jul04.222830.3705@delphi.com>, msanchez@delphi.com (Mateo Sánchez) writes: > 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. 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. -- === Bastien Lee === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "They will send a copy in my place." From asuzuki@u-tokyo.ac.jp Fri Jul 08 14:37:30 1994 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!asuzuki From: asuzuki@u-tokyo.ac.jp (Anja Suzuki) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jul08.143730.7594@u-tokyo.ac.jp> Date: Fri, 08 Jul 1994 14:37:30 GMT References: <1994Jul04.222830.3705@delphi.com> <1994Jul06.175130.5570@titech.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jul06.175130.5570@titech.ac.jp>, blee@titech.ac.jp (Bastien Lee) 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. -- Anja Suzuki Hayes Optima 288 @ ISDN 64k bps "The hatch is open. Is anyone listening?"