From stanaka@ox.ac.uk Sun Apr 28 02:15:55 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!stanaka
From: stanaka@ox.ac.uk (Steve Tanaka)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Apr28.021555.7836@ox.ac.uk>
Date: Sun, 28 Apr 1996 02:15:55 GMT
Organization: Oxford University Computing Laboratory
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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.

What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT?

-- 
Steve Tanaka | stanaka@ox.ac.uk
PGP Key fingerprint: A9EC 3D26 210C 4269
"Keep the channels open."

From nnovak@berkeley.edu Mon Apr 29 03:07:55 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!nnovak
From: nnovak@berkeley.edu (Nadia Novak)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Apr29.030755.4247@berkeley.edu>
Date: Mon, 29 Apr 1996 03:07:55 GMT
References: <1996Apr28.021555.7836@ox.ac.uk>
Organization: UC Berkeley Department of EECS
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In article <1996Apr28.021555.7836@ox.ac.uk>, stanaka@ox.ac.uk (Steve Tanaka) 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.

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
Nadia Novak
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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