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Re: Some links

To the amazement of many here, I'm sure, ;-) this is the sort of article that excites audio designers and shows a previously unpredicted problem with negative feedback, except for Otala's early paper, of course, that never got into the AES Journal, because it was considered too controversial by the Lipshitz crowd.

Hi John,

Yes, I seem to remember a pretty long thread about the Gilbert paper on DIYA :-). I think your interpretation of this paper is somewhat different from mine though. The conclusion I reached was that the closed-loop distortion was as usual much less than the open-loop distortion. However, the open-loop amp had no AM-to-PM conversion, while such distortion was present in the closed-loop amp. It seems to me that referring to this as a "problem" depends on the assumption that the subjective effect of the AM-to-PM distortion is far worse than that of AM-to-AM. I'm not aware of any studies that have taken place regarding the relative audibility of AM-to-PM distortion compared to AM-to-AM when the magnitude of the distortion components are equal. It would be interesting to find out though. But regardless of our differing interpretations, I think we both agree that it's an interesting paper that's well worth spending time on.

And speaking of interesting publications, there's a classic text on the Volterra series that for a long time was out of print and unavailable except for very expensive used copies. It is now back in print again, with new material added. I didn't realize until recently that for time-invariant nonlinear systems, the input-output relationship was completely described by the Volterra series, which includes the linear system theory as a special case. Very thought-provoking stuff. The book is The Volterra and Wiener Theories of Nonlinear Systems.

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