From jramirez@berkeley.edu Thu Jun 02 23:05:51 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!jramirez
From: jramirez@berkeley.edu (Joachim Ramírez)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Jun02.230551.1119@berkeley.edu>
Date: Thu, 02 Jun 1994 23:05:51 GMT
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Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.

A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor.
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.

MATLAB script available upon request via email.

-- 
Joachim Ramírez
Tape trading list upon request. SASE required for international mail.

From hgarcia@pacbell.net Sat Jun 04 00:01:51 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!hgarcia
From: hgarcia@pacbell.net (Hugo García)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Jun04.000151.1853@pacbell.net>
Date: Sat, 04 Jun 1994 00:01:51 GMT
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In article <1994Jun02.230551.1119@berkeley.edu>, jramirez@berkeley.edu (Joachim Ramírez) writes:
> Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.

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

Top-posters will be placed in my ~/.killfile without notice.

-- 
Hugo García | hgarcia@pacbell.net
PGP Key fingerprint: 2015 4535 9A0F 7624
"Keep the channels open."

From ogarcia@unam.mx Sat Jun 04 01:50:51 1994
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From: ogarcia@unam.mx (Olga García)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Jun04.015051.7941@unam.mx>
Date: Sat, 04 Jun 1994 01:50:51 GMT
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In article <1994Jun02.230551.1119@berkeley.edu>, jramirez@berkeley.edu (Joachim Ramírez) writes:
> Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.

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

-- 
Olga García
Tape trading list upon request. SASE required for international mail.

From bsilva@inria.fr Sun Jun 05 02:47:51 1994
Path: ashpoly!cascade!bigsur!inria!bsilva
From: bsilva@inria.fr (Bill Silva)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Jun05.024751.2101@inria.fr>
Date: Sun, 05 Jun 1994 02:47:51 GMT
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In article <1994Jun02.230551.1119@berkeley.edu>, jramirez@berkeley.edu (Joachim Ramírez) writes:
> Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.
> A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor.

Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz.

-- 
Bill Silva
Tape trading list upon request. SASE required for international mail.

From tsantos@berkeley.edu Sun Jun 05 19:09:51 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!tsantos
From: tsantos@berkeley.edu (Tyler Santos)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Jun05.190951.8414@berkeley.edu>
Date: Sun, 05 Jun 1994 19:09:51 GMT
References: <1994Jun02.230551.1119@berkeley.edu> <1994Jun04.015051.7941@unam.mx>
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In article <1994Jun04.015051.7941@unam.mx>, ogarcia@unam.mx (Olga García) writes:
> I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection.

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

PGP Public key available via finger or upon request.

-- 
Tyler Santos
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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