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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: Masking of intermods vs masking of harmonics posted by andy_c on June 14, 2006 at 07:13:24:
Are you sitting down? Strap yourself in or you may fall off your chair when you hear this.Starting on page 34 of his paper Cheever cites self harmonic distortion and distortion masking as part of his rationale for the basic thrust of his paper, development of the specification of T.A.D. which stands for "total aural disonance." This specification supposedly relates measured distortion to the degree of unpleasantness of sound. As you recall from other postings on this topic, I cited Cheever's contention that higher order harmonics of harmonic distortion should be more heavily weighted when judging the level of harmonic distortion. Here's part of it. The human ear generates its own harmonic distortion, fairly high levels of it and it generates more as sound gets louder (rattling your ears or teeth or something inside your head) but only at low harmonic numbers, n=1 and n=2. Then however, remarkably the brain filters it out so you hear only a pure fundimental tone. So far this is real. Now the kicker. Therefore according to Cheever, the brain will also filter out low order harmonic distortion in the same way (I'm not kidding, he really says this) proving that it's the higher order harmonics which are the bad actors. (This paper is really sickening, it is a complete embarrassment to read and realize this comes from a candidate for an M.E.E. at an acredited college in the United States.) BTW, this type of rationale runs through the entire paper so far. I'll have more to say about it when I finish re-reading it.
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Follow Ups
- Cheever's explanation of harmonic masking - Soundmind 19:20:47 06/14/06 (0)
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