From tjohansson@pipeline.com Sun Nov 12 02:49:18 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!tjohansson
From: tjohansson@pipeline.com (Thiago Johansson)
Newsgroups: comp.dsp
Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Nov12.024918.1084@pipeline.com>
Date: Sun, 12 Nov 1995 02:49:18 GMT
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Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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

-- 
=== Thiago Johansson ===
Dept of Electrical Engineering, The Pipeline Internet Network
"The hatch is open. Is anyone listening?"

From brobertson@pacbell.net Mon Nov 13 21:25:18 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!brobertson
From: brobertson@pacbell.net (Brian Robertson)
Newsgroups: comp.dsp
Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Nov13.212518.2988@pacbell.net>
Date: Mon, 13 Nov 1995 21:25:18 GMT
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In article <1995Nov12.024918.1084@pipeline.com>, tjohansson@pipeline.com (Thiago Johansson) 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.

-- 
Brian Robertson
Tape trading list upon request. SASE required for international mail.