From amartinez@demon.co.uk Wed Jan 03 10:11:58 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!amartinez
From: amartinez@demon.co.uk (Andrei Martínez)
Newsgroups: comp.dsp
Subject: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Jan03.101158.9650@demon.co.uk>
Date: Wed, 03 Jan 1996 10:11:58 GMT
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Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier.
A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor.

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

-- 
=== Andrei Martínez ===
Dept of Electrical Engineering, Demon Internet Services UK
"The hatch is open. Is anyone listening?"

From dfournier@purdue.edu Fri Jan 05 03:04:58 1996
Path: ashpoly!cascade!mxgate!coyoacan!purdue!dfournier
From: dfournier@purdue.edu (Dave Fournier)
Newsgroups: comp.dsp
Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Jan05.030458.2311@purdue.edu>
Date: Fri, 05 Jan 1996 03:04:58 GMT
References: <1996Jan03.101158.9650@demon.co.uk>
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In article <1996Jan03.101158.9650@demon.co.uk>, amartinez@demon.co.uk (Andrei Martínez) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.
> A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier.

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.

-- 
Dave Fournier
Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network.
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