From feriksson@delphi.com Sat Jan 14 19:21:37 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!feriksson From: feriksson@delphi.com (Freya Eriksson) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan14.192137.7671@delphi.com> Date: Sat, 14 Jan 1995 19:21:37 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N 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. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. MATLAB script available upon request via email. -- === Freya Eriksson === Dept of Electrical Engineering, Delphi Internet Services "There are 14 nodes and only 10 countries. Count again." From mlopez@demon.co.uk Mon Jan 16 12:15:37 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!mlopez From: mlopez@demon.co.uk (Mike López) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan16.121537.5275@demon.co.uk> Date: Mon, 16 Jan 1995 12:15:37 GMT References: <1995Jan14.192137.7671@delphi.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan14.192137.7671@delphi.com>, feriksson@delphi.com (Freya Eriksson) 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. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Mike López "In theory there is no difference between theory and practice." Atari TT030 / AmigaOS 3.1 From mkang@mindspring.com Tue Jan 17 08:44:37 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!mkang From: mkang@mindspring.com (Matthias Kang) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan17.084437.3181@mindspring.com> Date: Tue, 17 Jan 1995 08:44:37 GMT References: <1995Jan14.192137.7671@delphi.com> <1995Jan16.121537.5275@demon.co.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan16.121537.5275@demon.co.uk>, mlopez@demon.co.uk (Mike López) 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. -- Matthias Kang "In theory there is no difference between theory and practice." 486DX4/100 (FreeBSD 2.0.5) / NEXTSTEP 3.3