From akim@earthlink.net Mon Nov 06 21:11:33 1995 Path: ashpoly!cascade!bigsur!earthlink!akim From: akim@earthlink.net (Anja Kim) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov06.211133.8132@earthlink.net> Date: Mon, 06 Nov 1995 21:11:33 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Anja Kim -- EarthLink Network "Measuring a record you own is listening, not piracy." From dmoreau@titech.ac.jp Tue Nov 07 18:29:33 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!dmoreau From: dmoreau@titech.ac.jp (Dmitri Moreau) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov07.182933.8193@titech.ac.jp> Date: Tue, 07 Nov 1995 18:29:33 GMT References: <1995Nov06.211133.8132@earthlink.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Nov06.211133.8132@earthlink.net>, akim@earthlink.net (Anja Kim) 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. PGP Public key available via finger or upon request. -- === Dmitri Moreau === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "Marcus is not one man." From koliveira@stanford.edu Thu Nov 09 10:34:33 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!koliveira From: koliveira@stanford.edu (Kirsty Oliveira) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov09.103433.7782@stanford.edu> Date: Thu, 09 Nov 1995 10:34:33 GMT References: <1995Nov06.211133.8132@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov06.211133.8132@earthlink.net>, akim@earthlink.net (Anja Kim) 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. -- Kirsty Oliveira Hayes Optima 288 @ 33,600 bps "They will send a copy in my place."