From kcampbell@stanford.edu Wed Nov 15 15:25:59 1995
Path: ashpoly!cascade!brgate!saturno!stanford!kcampbell
From: kcampbell@stanford.edu (Karen Campbell)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Nov15.152559.1200@stanford.edu>
Date: Wed, 15 Nov 1995 15:25:59 GMT
Organization: Stanford University Computer Systems Lab
NNTP-Posting-Host: stanford.edu
X-Newsreader: TIN [version 1.2 PL2]
Lines: 11

A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width.
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.

-- 
=== Karen Campbell ===
Dept of Electrical Engineering, Stanford University Computer Systems Lab
"They will send a copy in my place."

From rkang@earthlink.net Thu Nov 16 02:20:59 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!rkang
From: rkang@earthlink.net (Rodrigo Kang)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Nov16.022059.7458@earthlink.net>
Date: Thu, 16 Nov 1995 02:20:59 GMT
References: <1995Nov15.152559.1200@stanford.edu>
Organization: EarthLink Network
NNTP-Posting-Host: earthlink.net
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1995Nov15.152559.1200@stanford.edu>, kcampbell@stanford.edu (Karen Campbell) writes:
> A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips.

Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform.

-- 
Rodrigo Kang
Opinions expressed are solely my own and not those of EarthLink Network.
------------------------------------------------------------