From sbrennan@demon.co.uk Tue Dec 03 06:56:48 1996
Path: ashpoly!cascade!mxgate!coyoacan!demon!sbrennan
From: sbrennan@demon.co.uk (Seo-yeon Brennan)
Newsgroups: comp.dsp
Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Dec03.065648.9267@demon.co.uk>
Date: Tue, 03 Dec 1996 06:56:48 GMT
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A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

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 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.

-- 
Seo-yeon Brennan | sbrennan@demon.co.uk
PGP Key fingerprint: 2AB2 A454 94BB F134
"Keep the channels open."

From asuzuki@kiae.su Tue Dec 03 11:30:48 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!asuzuki
From: asuzuki@kiae.su (Anton Suzuki)
Newsgroups: comp.dsp
Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Dec03.113048.6000@kiae.su>
Date: Tue, 03 Dec 1996 11:30:48 GMT
References: <1996Dec03.065648.9267@demon.co.uk>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1996Dec03.065648.9267@demon.co.uk>, sbrennan@demon.co.uk (Seo-yeon Brennan) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

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

PGP Public key available via finger or upon request.

-- 
=== Anton Suzuki ===
Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow
"We don't sign stars. We build them."