From brobertson@earthlink.net Fri Dec 23 01:54:58 1994
Path: ashpoly!cascade!bigsur!earthlink!brobertson
From: brobertson@earthlink.net (Bastien Robertson)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Dec23.015458.4755@earthlink.net>
Date: Fri, 23 Dec 1994 01:54:58 GMT
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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 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor.

MATLAB script available upon request via email.

-- 
Bastien Robertson
Tape trading list upon request. SASE required for international mail.

From elopez@illinois.edu Fri Dec 23 10:22:58 1994
Path: ashpoly!cascade!brgate!saturno!illinois!elopez
From: elopez@illinois.edu (Élodie López)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Dec23.102258.2508@illinois.edu>
Date: Fri, 23 Dec 1994 10:22:58 GMT
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In article <1994Dec23.015458.4755@earthlink.net>, brobertson@earthlink.net (Bastien Robertson) 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.

-- 
Élodie López
Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign.
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