Re: KPA-500 "Output for Input" schedule?
Posted by
P.B. Christensen on
May 12, 2011; 11:41pm
URL: http://elecraft.85.s1.nabble.com/KPA-500-Output-for-Input-schedule-tp6352735p6357616.html
> I would like to know if some kind of feedback (maybe complicated)
> could bring about a quantum leap in linearity, like sampling the
> output of the amp and feeding that back to the K3 to digitally
> pre-alter the audio to cancel the distortion going out.
That's exactly the function of adaptive pre-distortion.and is used in the
ADAT ADT-200A. Scarce as that rig is, it works well.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.123.2357&rep=rep1&type=pdfSee the section entitled "The Predistortion Concept." The adaptive part of
predistortion comes from the use of a dynamic algorithm like LMS -- the
same, or nearly the same algorithm used in the K3's denoiser DSP function.
Paul, W9AC
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