From mmuller@demon.co.uk Sun Mar 26 15:36:16 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!mmuller
From: mmuller@demon.co.uk (Matthias Müller)
Newsgroups: comp.dsp
Subject: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Mar26.153616.2072@demon.co.uk>
Date: Sun, 26 Mar 1995 15:36:16 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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier.
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.

-- 
=== Matthias Müller ===
Dept of Electrical Engineering, Demon Internet Services UK
"There are 14 nodes and only 10 countries. Count again."

From lokonkwo@u-tokyo.ac.jp Mon Mar 27 23:51:16 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!lokonkwo
From: lokonkwo@u-tokyo.ac.jp (Liam Okonkwo)
Newsgroups: comp.dsp
Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Mar27.235116.8323@u-tokyo.ac.jp>
Date: Mon, 27 Mar 1995 23:51:16 GMT
References: <1995Mar26.153616.2072@demon.co.uk>
Organization: University of Tokyo Department of Information Science
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In article <1995Mar26.153616.2072@demon.co.uk>, mmuller@demon.co.uk (Matthias Müller) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.
> A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier.

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

-- 
Liam Okonkwo
Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science.
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From hwatanabe@cmu.edu Thu Mar 30 02:08:16 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!hwatanabe
From: hwatanabe@cmu.edu (Hugo Watanabe)
Newsgroups: comp.dsp
Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Mar30.020816.8998@cmu.edu>
Date: Thu, 30 Mar 1995 02:08:16 GMT
References: <1995Mar26.153616.2072@demon.co.uk>
Organization: Carnegie Mellon University School of CS
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In article <1995Mar26.153616.2072@demon.co.uk>, mmuller@demon.co.uk (Matthias Müller) 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.

-- 
Hugo Watanabe
Tape trading list upon request. SASE required for international mail.

From mandersson@illinois.edu Thu Mar 30 15:08:16 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!mandersson
From: mandersson@illinois.edu (Marisol Andersson)
Newsgroups: comp.dsp
Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Mar30.150816.2091@illinois.edu>
Date: Thu, 30 Mar 1995 15:08:16 GMT
References: <1995Mar26.153616.2072@demon.co.uk> <1995Mar27.235116.8323@u-tokyo.ac.jp>
Organization: University of Illinois Urbana-Champaign
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In article <1995Mar27.235116.8323@u-tokyo.ac.jp>, lokonkwo@u-tokyo.ac.jp (Liam Okonkwo) writes:
> Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz.

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

PGP Public key available via finger or upon request.

-- 
Marisol Andersson
Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign.
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