From jnovak@delphi.com Sat Mar 02 20:07:03 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!jnovak From: jnovak@delphi.com (Julien Novak) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Mar02.200703.8351@delphi.com> Date: Sat, 02 Mar 1996 20:07:03 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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. 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. -- Julien Novak *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From echoi@mindspring.com Mon Mar 04 17:04:03 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!echoi From: echoi@mindspring.com (Elaine Choi) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Mar04.170403.3000@mindspring.com> Date: Mon, 04 Mar 1996 17:04:03 GMT References: <1996Mar02.200703.8351@delphi.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Mar02.200703.8351@delphi.com>, jnovak@delphi.com (Julien Novak) 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. -- Elaine Choi US Robotics Courier V.34 @ ISDN 64k bps "Tape doesn't lie at 02:14. Ears do."