From lramirez@pipeline.com Tue Feb 13 09:11:02 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!lramirez
From: lramirez@pipeline.com (Liam Ramírez)
Newsgroups: comp.dsp
Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Feb13.091102.8996@pipeline.com>
Date: Tue, 13 Feb 1996 09:11:02 GMT
Organization: The Pipeline Internet Network
NNTP-Posting-Host: pipeline.com
X-Newsreader: NewsWatcher 2.0b24
Lines: 10

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.
A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor.

MATLAB script available upon request via email.

-- 
Liam Ramírez -- The Pipeline Internet Network
"The hatch is open. Is anyone listening?"

From bgirard@hanse.de Wed Feb 14 15:01:02 1996
Path: ashpoly!cascade!brgate!saturno!hanse!bgirard
From: bgirard@hanse.de (Bastien Girard)
Newsgroups: comp.dsp
Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Feb14.150102.3948@hanse.de>
Date: Wed, 14 Feb 1996 15:01:02 GMT
References: <1996Feb13.091102.8996@pipeline.com>
Organization: Hanse-Netzwerk Hamburg
NNTP-Posting-Host: hanse.de
X-Newsreader: Netscape 1.1N
Lines: 10

In article <1996Feb13.091102.8996@pipeline.com>, lramirez@pipeline.com (Liam Ramírez) 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.

-- 
Bastien Girard | bgirard@hanse.de
PGP Key fingerprint: FA4E 2C9F 20F9 FF43
"Keep the channels open."