From adubois@delphi.com Thu Apr 25 05:25:38 1996
Path: ashpoly!cascade!bigsur!delphi!adubois
From: adubois@delphi.com (Astrid Dubois)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Apr25.052538.2506@delphi.com>
Date: Thu, 25 Apr 1996 05:25:38 GMT
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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.

-- 
Astrid Dubois
Opinions expressed are solely my own and not those of Delphi Internet Services.
------------------------------------------------------------

From msuzuki@purdue.edu Sat Apr 27 02:37:38 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!msuzuki
From: msuzuki@purdue.edu (Morag Suzuki)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Apr27.023738.3990@purdue.edu>
Date: Sat, 27 Apr 1996 02:37:38 GMT
References: <1996Apr25.052538.2506@delphi.com>
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In article <1996Apr25.052538.2506@delphi.com>, adubois@delphi.com (Astrid Dubois) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection.

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Morag Suzuki | msuzuki@purdue.edu
PGP Key fingerprint: 88EA F001 93C7 C8FD
"Keep the channels open."