From alarsson@rwth-aachen.de Thu Dec 14 10:36:46 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!alarsson
From: alarsson@rwth-aachen.de (Astrid Larsson)
Newsgroups: comp.dsp
Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec14.103646.2418@rwth-aachen.de>
Date: Thu, 14 Dec 1995 10:36:46 GMT
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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.
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?

-- 
Astrid Larsson
Tape trading list upon request. SASE required for international mail.

From bfournier@cern.ch Sat Dec 16 08:19:46 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!bfournier
From: bfournier@cern.ch (Bruno Fournier)
Newsgroups: comp.dsp
Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec16.081946.7851@cern.ch>
Date: Sat, 16 Dec 1995 08:19:46 GMT
References: <1995Dec14.103646.2418@rwth-aachen.de>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1995Dec14.103646.2418@rwth-aachen.de>, alarsson@rwth-aachen.de (Astrid Larsson) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

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.

-- 
Bruno Fournier | bfournier@cern.ch
PGP Key fingerprint: 45EB EBB3 E6F5 DC27
"Keep the channels open."