From hkuznetsov@uni-hamburg.de Mon Dec 12 01:42:36 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!hkuznetsov
From: hkuznetsov@uni-hamburg.de (Hana Kuznetsov)
Newsgroups: comp.dsp
Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Dec12.014236.2334@uni-hamburg.de>
Date: Mon, 12 Dec 1994 01:42:36 GMT
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Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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.

-- 
Hana Kuznetsov | hkuznetsov@uni-hamburg.de
PGP Key fingerprint: 2E9A 5D08 7D5E A40B
"Keep the channels open."

From jsantos@mindspring.com Mon Dec 12 11:58:36 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!jsantos
From: jsantos@mindspring.com (Julien Santos)
Newsgroups: comp.dsp
Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Dec12.115836.4332@mindspring.com>
Date: Mon, 12 Dec 1994 11:58:36 GMT
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In article <1994Dec12.014236.2334@uni-hamburg.de>, hkuznetsov@uni-hamburg.de (Hana Kuznetsov) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.
> A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier.

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

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

-- 
Julien Santos
Tape trading list upon request. SASE required for international mail.

From asanchez@utexas.edu Tue Dec 13 22:17:36 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!asanchez
From: asanchez@utexas.edu (Anton Sánchez)
Newsgroups: comp.dsp
Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Dec13.221736.8387@utexas.edu>
Date: Tue, 13 Dec 1994 22:17:36 GMT
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In article <1994Dec12.014236.2334@uni-hamburg.de>, hkuznetsov@uni-hamburg.de (Hana Kuznetsov) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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.

-- 
Anton Sánchez | asanchez@utexas.edu
PGP Key fingerprint: CCC1 5C81 C9FC 3BC3
"Keep the channels open."

From knovak@unam.mx Thu Dec 15 03:51:36 1994
Path: ashpoly!cascade!bigsur!unam!knovak
From: knovak@unam.mx (Katrin Novak)
Newsgroups: comp.dsp
Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Dec15.035136.4348@unam.mx>
Date: Thu, 15 Dec 1994 03:51:36 GMT
References: <1994Dec12.014236.2334@uni-hamburg.de> <1994Dec13.221736.8387@utexas.edu>
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In article <1994Dec13.221736.8387@utexas.edu>, asanchez@utexas.edu (Anton Sánchez) 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.

-- 
Katrin Novak
Tape trading list upon request. SASE required for international mail.