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[Amps] IM Distortion

To: <amps@contesting.com>
Subject: [Amps] IM Distortion
From: w8ji at contesting.com (Tom Rauch)
Date: Wed Mar 5 10:31:32 2003
>        My suspicion (that means somewhere between an 'opinion' and a
'fact')
> is that if standard two tone tests were performed, using a few different
> audio frequencies and applying some weighting/averaging rule to them, were
> applied to the same setup, there would be a large correlation with the
> referenced results. I would like to see that done (maybe it has and the
news
> just hasn't arrived here yet.) as a qualification for or against the
> spectrally averaged method as proposed.


The three-tone test I used to use does this. It is basically a two-tone test
with levels varied at a syllabic rate. It is best to do that test with the
HF tones at close spacing and at wide.

Unfortunately the test I used is no easier and no better than just using
speech, it is actually more complex and gives no better answers.

I think speech is the best test.

73 Tom

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