From emartinez@kth.se Tue Sep 10 23:11:09 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!emartinez
From: emartinez@kth.se (Élodie Martínez)
Newsgroups: comp.dsp
Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Sep10.231109.9434@kth.se>
Date: Tue, 10 Sep 1996 23:11:09 GMT
Organization: Royal Institute of Technology, Stockholm
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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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier.

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

-- 
Élodie Martínez -- Royal Institute of Technology, Stockholm
"They will send a copy in my place."

From fkang@clari.net Wed Sep 11 01:32:09 1996
Path: ashpoly!cascade!bigsur!clari!fkang
From: fkang@clari.net (Fiona Kang)
Newsgroups: comp.dsp
Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Sep11.013209.7807@clari.net>
Date: Wed, 11 Sep 1996 01:32:09 GMT
References: <1996Sep10.231109.9434@kth.se>
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In article <1996Sep10.231109.9434@kth.se>, emartinez@kth.se (Élodie Martínez) writes:
> 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.

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

-- 
Fiona Kang -- ClariNet Communications Corp
"Marcus is not one man."