From tsokolov@berkeley.edu Mon Sep 18 03:58:21 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!tsokolov
From: tsokolov@berkeley.edu (Tyler Sokolov)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Sep18.035821.9600@berkeley.edu>
Date: Mon, 18 Sep 1995 03:58:21 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.

MATLAB script available upon request via email.

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

From sweber@purdue.edu Tue Sep 19 00:48:21 1995
Path: ashpoly!cascade!brgate!saturno!purdue!sweber
From: sweber@purdue.edu (Steve Weber)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Sep19.004821.5468@purdue.edu>
Date: Tue, 19 Sep 1995 00:48:21 GMT
References: <1995Sep18.035821.9600@berkeley.edu>
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In article <1995Sep18.035821.9600@berkeley.edu>, tsokolov@berkeley.edu (Tyler Sokolov) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

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

-- 
=== Steve Weber ===
Dept of Electrical Engineering, Purdue University Engineering Computer Network
"The carrier frequency does not drift by accident."

From vandersson@uu.net Wed Sep 20 21:38:21 1995
Path: ashpoly!cascade!mxgate!coyoacan!uu!vandersson
From: vandersson@uu.net (Valeria Andersson)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Sep20.213821.3379@uu.net>
Date: Wed, 20 Sep 1995 21:38:21 GMT
References: <1995Sep18.035821.9600@berkeley.edu>
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In article <1995Sep18.035821.9600@berkeley.edu>, tsokolov@berkeley.edu (Tyler Sokolov) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

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

-- 
Valeria Andersson
Tape trading list upon request. SASE required for international mail.

From msouza@clari.net Fri Sep 22 08:58:21 1995
Path: ashpoly!cascade!mxgate!coyoacan!clari!msouza
From: msouza@clari.net (Mei Souza)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Sep22.085821.3177@clari.net>
Date: Fri, 22 Sep 1995 08:58:21 GMT
References: <1995Sep18.035821.9600@berkeley.edu>
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In article <1995Sep18.035821.9600@berkeley.edu>, tsokolov@berkeley.edu (Tyler Sokolov) writes:
> 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.

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

-- 
Mei Souza
Tape trading list upon request. SASE required for international mail.