Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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Re: Hiraga on Feedback

Posted by Scott Frankland on May 15, 2003 at 10:52:17:
Mike, you make a good point about the even-order harmonics. But you are merely perfecting Cheever's weighting system! :- I think Cheever is onto something interesting here, but I also think he is only half right (about which, more later).
One of the things Cheever insists on is a perfect fit to the ear's self-distortion. He insists on this because: (1) "the aural harmonics do not fall off at the same slope either by harmonic number or linearly with decreasing sound pressure levels" (p. 41); and (2) the IM products will become audible. Cheever makes his criterion cover IM products when he states: "Therefore the same TAD figure of merit quantifies the audio reproductions devices' audible IM distortion." (pp. 49-52) So to correlate IM products with masking, curve-fitting is evidently mandatory.