From khughes@inria.fr Tue Dec 05 21:28:33 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!khughes
From: khughes@inria.fr (Kirsty Hughes)
Newsgroups: comp.dsp
Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec05.212833.4043@inria.fr>
Date: Tue, 05 Dec 1995 21:28:33 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.
A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width.

Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble.

-- 
Kirsty Hughes
Tape trading list upon request. SASE required for international mail.

From mgirard@berkeley.edu Thu Dec 07 19:21:33 1995
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From: mgirard@berkeley.edu (Matthias Girard)
Newsgroups: comp.dsp
Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec07.192133.9701@berkeley.edu>
Date: Thu, 07 Dec 1995 19:21:33 GMT
References: <1995Dec05.212833.4043@inria.fr>
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In article <1995Dec05.212833.4043@inria.fr>, khughes@inria.fr (Kirsty Hughes) 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.

-- 
Matthias Girard -- UC Berkeley Department of EECS
"Hardware is temporary. The signal survives."