From lmuller@cern.ch Fri Mar 25 11:40:10 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!cern!lmuller
From: lmuller@cern.ch (Lisa Müller)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Mar25.114010.5744@cern.ch>
Date: Fri, 25 Mar 1994 11:40:10 GMT
Organization: European Laboratory for Particle Physics, Geneva
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A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width.
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.

-- 
Lisa Müller | lmuller@cern.ch
PGP Key fingerprint: D49D 2727 A6A3 64DE
"Keep the channels open."

From jlopez@hanse.de Sun Mar 27 04:50:10 1994
Path: ashpoly!cascade!mxgate!coyoacan!hanse!jlopez
From: jlopez@hanse.de (Ji-woo López)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Mar27.045010.9668@hanse.de>
Date: Sun, 27 Mar 1994 04:50:10 GMT
References: <1994Mar25.114010.5744@cern.ch>
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In article <1994Mar25.114010.5744@cern.ch>, lmuller@cern.ch (Lisa Müller) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

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.

-- 
Ji-woo López
Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg.
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