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RE: Psychoacoustics is about correlating what we hear with what we measure

Posted by morricab on December 1, 2016 at 07:23:42:
It is also inaudible up to about 2%...with a pure sine wave. This means that with real music, even higher levels are likely to go unnoticed.

Keith Howard reported that even predominantly 2nd harmonic was not better sounding than an undistorted file when he made digital files with added distortion of different types. He did find; however, that a monotonic pattern (i.e. with even and odd harmonics falling away exponentially) was the least damaging of the file. This is totally consistent with what Hiraga was claiming and also what Cheever found.

All odd harmonic patterns, even at low levels, were the least pleasant and all even patterns were in the middle somewhere. Most well designed push/pull amps will have predominantly odd harmonics.

The human ear/brain is accustomed to a monotonic pattern, which is what the ear mechanism generates on it's own. Therefore, masking is pretty good if that pattern, at a given SPL, is followed closely.

Since there is no electronic equivalent to the undistorted file, the best we can do at this time is to have the least damaging pattern.

Note, Mr. Howard did not find ANY of the patterns Euphonic and preferrable to the undistorted original.