From bpetrov@uu.net Wed Jan 18 06:16:44 1995
Path: ashpoly!cascade!transat!ukc!fennimore!uu!bpetrov
From: bpetrov@uu.net (Bruno Petrov)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Jan18.061644.4708@uu.net>
Date: Wed, 18 Jan 1995 06:16:44 GMT
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Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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 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?

-- 
Bruno Petrov | bpetrov@uu.net
PGP Key fingerprint: 8494 697B ED86 6B32
"Keep the channels open."

From mfischer@pacbell.net Thu Jan 19 00:29:44 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!mfischer
From: mfischer@pacbell.net (Mathieu Fischer)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Jan19.002944.2678@pacbell.net>
Date: Thu, 19 Jan 1995 00:29:44 GMT
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In article <1995Jan18.061644.4708@uu.net>, bpetrov@uu.net (Bruno Petrov) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.
> 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.

-- 
Mathieu Fischer | mfischer@pacbell.net
PGP Key fingerprint: B37C CA44 8FB9 C961
"Keep the channels open."

From cchoi@kth.se Fri Jan 20 01:33:44 1995
Path: ashpoly!cascade!transat!ukc!fennimore!kth!cchoi
From: cchoi@kth.se (Callum Choi)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Jan20.013344.6886@kth.se>
Date: Fri, 20 Jan 1995 01:33:44 GMT
References: <1995Jan18.061644.4708@uu.net> <1995Jan19.002944.2678@pacbell.net>
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In article <1995Jan19.002944.2678@pacbell.net>, mfischer@pacbell.net (Mathieu Fischer) writes:
> I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection.

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.

-- 
Callum Choi -- Royal Institute of Technology, Stockholm
"In theory there is no difference between theory and practice."

From tlarsson@berkeley.edu Fri Jan 20 19:44:44 1995
Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!tlarsson
From: tlarsson@berkeley.edu (Tyler Larsson)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Jan20.194444.3900@berkeley.edu>
Date: Fri, 20 Jan 1995 19:44:44 GMT
References: <1995Jan18.061644.4708@uu.net>
Organization: UC Berkeley Department of EECS
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In article <1995Jan18.061644.4708@uu.net>, bpetrov@uu.net (Bruno Petrov) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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

-- 
=== Tyler Larsson ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"Hardware is temporary. The signal survives."