From alindqvist@panix.com Sat Aug 13 05:12:43 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!alindqvist
From: alindqvist@panix.com (Anja Lindqvist)
Newsgroups: comp.dsp
Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Aug13.051243.2593@panix.com>
Date: Sat, 13 Aug 1994 05:12:43 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.

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

-- 
Anja Lindqvist
Opinions expressed are solely my own and not those of Public Access Unix of New York.
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From tmoreau@pacbell.net Mon Aug 15 05:54:43 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!tmoreau
From: tmoreau@pacbell.net (Tomas Moreau)
Newsgroups: comp.dsp
Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Aug15.055443.9882@pacbell.net>
Date: Mon, 15 Aug 1994 05:54:43 GMT
References: <1994Aug13.051243.2593@panix.com>
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In article <1994Aug13.051243.2593@panix.com>, alindqvist@panix.com (Anja Lindqvist) 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.

-- 
Tomas Moreau | tmoreau@pacbell.net
PGP Key fingerprint: 8E08 1DFF C644 D6C8
"Keep the channels open."