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From: sam@hemuli.tik.vtt.fi (Sakari Mattila)
Newsgroups: comp.dsp
Subject: Re: Practical DSP problem
Message-ID: <5171@hemuli.tik.vtt.fi>
Date: 10 Oct 90 09:02:47 GMT
References: <5169@hemuli.tik.vtt.fi> <3594@syma.sussex.ac.uk>
Organization: Technical Research Centre of Finland, Laboratory for Information Processing (VTT/TIK)
Lines: 12


 
In old good analog world, I would high-pass or band reject filter these
fundamental frequencies. Then it could be possible to recover the wanted
mixed harmonic using autocorrelation or band-pass filtering.  I suppose,
that tit is necessary to measure a band around the measured harmonic in
order to estimate the increase of general noise level in your circuit
caused by the test signals f1 and f2. 
 
-- 
Sakari M. Mattila    71307.1525@CompuServe.COM
                     mattila@tik.vtt.fi    Sakari Mattila@3:663*371.0.FNET