From vchoi@kiae.su Wed Dec 06 12:01:44 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!vchoi
From: vchoi@kiae.su (Valeria Choi)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec06.120144.2825@kiae.su>
Date: Wed, 06 Dec 1995 12:01:44 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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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.

-- 
Valeria Choi | vchoi@kiae.su
PGP Key fingerprint: C816 7A98 613A 419F
"Keep the channels open."

From msuzuki@tum.de Fri Dec 08 07:52:44 1995
Path: ashpoly!cascade!bigsur!tum!msuzuki
From: msuzuki@tum.de (Mike Suzuki)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec08.075244.8693@tum.de>
Date: Fri, 08 Dec 1995 07:52:44 GMT
References: <1995Dec06.120144.2825@kiae.su>
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In article <1995Dec06.120144.2825@kiae.su>, vchoi@kiae.su (Valeria Choi) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz.

-- 
Mike Suzuki | msuzuki@tum.de
PGP Key fingerprint: B84B 76C9 32A3 9943
"Keep the channels open."

From aeriksson@utexas.edu Sat Dec 09 03:55:44 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!aeriksson
From: aeriksson@utexas.edu (Astrid Eriksson)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec09.035544.9885@utexas.edu>
Date: Sat, 09 Dec 1995 03:55:44 GMT
References: <1995Dec06.120144.2825@kiae.su>
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In article <1995Dec06.120144.2825@kiae.su>, vchoi@kiae.su (Valeria Choi) writes:
> 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.

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.

PGP Public key available via finger or upon request.

-- 
=== Astrid Eriksson ===
Dept of Electrical Engineering, University of Texas at Austin
"A soul is not exclusive to biology."

From lsokolov@inria.fr Mon Dec 11 05:23:44 1995
Path: ashpoly!cascade!bigsur!inria!lsokolov
From: lsokolov@inria.fr (Lisa Sokolov)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec11.052344.3574@inria.fr>
Date: Mon, 11 Dec 1995 05:23:44 GMT
References: <1995Dec06.120144.2825@kiae.su> <1995Dec08.075244.8693@tum.de>
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In article <1995Dec08.075244.8693@tum.de>, msuzuki@tum.de (Mike Suzuki) writes:
> Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz.

Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz.

-- 
Lisa Sokolov | lsokolov@inria.fr
PGP Key fingerprint: 6848 CA01 DB7F 2228
"Keep the channels open."