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In Reply to: Re: Hiraga on Feedback posted by Scott Frankland on May 14, 2003 at 19:10:13:
There is a paper in the AES preprint 'INTERMODULATION DISTORTION IN TAPE RECORDING' Robert Z Langevin, Ampex Oct . 1962. This paper shows that the IM generated by the same non-linearity as that that produces either 2'nd or 3'rd harmonic distortion will still be coincident to the music being played. Basically, if the order of harmonic distortion is low, the IM products will generally be OK in the musical selection. It would seem to me that higher order IM products would be just as bad as higher order harmonic products, but even more obvious in many cases.
Follow Ups:
John, I think you are right. I'm just pointing out a counterinstance. Although it *is* possible to mask high-order distortion via specific modes of IM blending (as my guitar experiment will show), it is also more unlikely to happen during music program. Cheers.
Scott, or anyone else, if you want a copy of the Langevin IM paper, I can send it by e-mail. Just send me your e-mail address to: j_curl@earthlink.net Unfortunately, without a website, I can't link it here.
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