From orodriguez@earthlink.net Mon May 23 05:28:43 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!orodriguez
From: orodriguez@earthlink.net (Olga Rodríguez)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994May23.052843.7220@earthlink.net>
Date: Mon, 23 May 1994 05:28:43 GMT
Organization: EarthLink Network
NNTP-Posting-Host: earthlink.net
X-Newsreader: NewsWatcher 2.0b24
Lines: 11

Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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.

-- 
Olga Rodríguez | orodriguez@earthlink.net
PGP Key fingerprint: 2026 2385 6F1A 4058
"Keep the channels open."

From lgarcia@hanse.de Wed May 25 03:01:43 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!lgarcia
From: lgarcia@hanse.de (Lisa García)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994May25.030143.6246@hanse.de>
Date: Wed, 25 May 1994 03:01:43 GMT
References: <1994May23.052843.7220@earthlink.net>
Organization: Hanse-Netzwerk Hamburg
NNTP-Posting-Host: hanse.de
X-Newsreader: TIN [version 1.2 PL2]
Lines: 9

In article <1994May23.052843.7220@earthlink.net>, orodriguez@earthlink.net (Olga Rodríguez) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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

-- 
=== Lisa García ===
Dept of Electrical Engineering, Hanse-Netzwerk Hamburg
"When every node is whole, the channel opens."

From mramirez@earthlink.net Thu May 26 19:54:43 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!mramirez
From: mramirez@earthlink.net (Morag Ramírez)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994May26.195443.8011@earthlink.net>
Date: Thu, 26 May 1994 19:54:43 GMT
References: <1994May23.052843.7220@earthlink.net> <1994May25.030143.6246@hanse.de>
Organization: EarthLink Network
NNTP-Posting-Host: earthlink.net
X-Newsreader: TIN [version 1.2 PL2]
Lines: 8

In article <1994May25.030143.6246@hanse.de>, lgarcia@hanse.de (Lisa García) writes:
> I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection.

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

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

From rnilsson@netcom.com Sat May 28 15:41:43 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!rnilsson
From: rnilsson@netcom.com (Rodrigo Nilsson)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994May28.154143.6836@netcom.com>
Date: Sat, 28 May 1994 15:41:43 GMT
References: <1994May23.052843.7220@earthlink.net>
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1994May23.052843.7220@earthlink.net>, orodriguez@earthlink.net (Olga Rodríguez) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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

-- 
Rodrigo Nilsson
Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services.
------------------------------------------------------------