From asouza@cam.ac.uk Mon Apr 24 22:51:15 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!asouza
From: asouza@cam.ac.uk (Amy Souza)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Apr24.225115.5905@cam.ac.uk>
Date: Mon, 24 Apr 1995 22:51:15 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.
A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width.

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

-- 
Amy Souza | asouza@cam.ac.uk
PGP Key fingerprint: 864D 335A 3D20 9F6E
"Keep the channels open."

From tnakamura@uni-hamburg.de Wed Apr 26 07:38:15 1995
Path: ashpoly!cascade!bigsur!uni-hamburg!tnakamura
From: tnakamura@uni-hamburg.de (Tobias Nakamura)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Apr26.073815.5912@uni-hamburg.de>
Date: Wed, 26 Apr 1995 07:38:15 GMT
References: <1995Apr24.225115.5905@cam.ac.uk>
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In article <1995Apr24.225115.5905@cam.ac.uk>, asouza@cam.ac.uk (Amy Souza) 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.

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Tobias Nakamura | tnakamura@uni-hamburg.de
PGP Key fingerprint: 9742 A4FB 9C25 FA2A
"Keep the channels open."

From jkang@rwth-aachen.de Thu Apr 27 00:51:15 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!jkang
From: jkang@rwth-aachen.de (Jens Kang)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Apr27.005115.2642@rwth-aachen.de>
Date: Thu, 27 Apr 1995 00:51:15 GMT
References: <1995Apr24.225115.5905@cam.ac.uk> <1995Apr26.073815.5912@uni-hamburg.de>
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In article <1995Apr26.073815.5912@uni-hamburg.de>, tnakamura@uni-hamburg.de (Tobias Nakamura) writes:
> Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz.
> Unsubscribe me from this list! (Wait, this is Usenet, never mind).

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

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
Jens Kang | jkang@rwth-aachen.de
PGP Key fingerprint: 5A39 F4AE 8060 C6BA
"Keep the channels open."

From hlopez@inria.fr Thu Apr 27 07:45:15 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!hlopez
From: hlopez@inria.fr (Hana López)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Apr27.074515.4760@inria.fr>
Date: Thu, 27 Apr 1995 07:45:15 GMT
References: <1995Apr24.225115.5905@cam.ac.uk>
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In article <1995Apr24.225115.5905@cam.ac.uk>, asouza@cam.ac.uk (Amy Souza) 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.

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Hana López -- INRIA Rocquencourt
"There are 14 nodes and only 10 countries. Count again."