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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Audioquest DBS cables posted by Scott Frankland on June 13, 2003 at 09:28:38:
In magnetics this type of distortion is due to anisotropy in the magnetic material, which in turn causes nonlinearity in the hysteresis characteristic. The primary physical mechanism is molecular friction among the domains, which is greatest at low flux levels. This is known as "shape anisotropy". The domains, in their attempt to rotate with signal-polarity reversals, must first overcome their tendency to "fit together" at their crystal boundaries. This causes the domains to snap suddenly open after a brief period of inertia (Barkhausen jumps). During this initial period of struggle the domains fail to precisely follow the flux change. Permalloy largely overcomes this type of distortion because the constituent alloys have complementary expansion coefficients (i.e., there is little magnetostriction of the material overall).Yes.
But applying a bias (magnetic in this case but the principle is the same) would not eliminate the nonlinear B/H relationship. It would just make it asymmetrical and you'd just end up with a decrease in odd-ordered harmonics and an increase in even-ordered harmonics. Which may be all well and good in itself.
But it seems the goal in this instance is to eliminate what amounts to crossover distortion, much as you would by biasing an output stage into pure class A or perhaps more appropriate an analogy here, going to a single-ended output scheme. And that's a whole different issue from hysteresis.
And while hysteresis is well known with regard to magnetic materials and even in dielectrics at high frequencies, I can't think of any property of a dielectric which would constitute crossover distortion which would require some sort of discontinuity between two complimentary unipolar elements.
se
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Follow Ups
- Re: Audioquest DBS cables - Steve Eddy 10:07:19 06/13/03 (1)
- Re: Audioquest DBS cables - Victor Khomenko 16:14:41 06/13/03 (0)
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