Το βιβλίο του D'Appolito δεν το έχω. Προς το παρόνΩς προς τον Toole, προφανώς αναφέρεσαι στο εξής απόσπασμα:
"Thus began the legend that harmonic distortions are relatively benign and intermodulation distortions are bad. It is true in the context of these test signals, but they are both simply different ways of quantifying the same problem (the nonlinearity in the loudspeaker), and neither test signal (one tone or two) is even a crude approximation of human voices or music. Contributing to the mismatch between perception and measurement is the fact that such a technical measurement totally ignores masking. Included in the numbers generated by the measurements are distortion components that, to humans, are partially or completely masked. The numbers are wrong.
The end result of this is that traditional measures of harmonic or intermodulation distortion are almost meaningless. They do not quantify distortion in a way that can, with any reliability, predict a human response to it while listening to music or movies. They do not correlate because they ignore any characteristics of the human receptor, an outrageously nonlinear device in its own right. The excessive simplicity of the signals also remains a problem. Music and movies offer an infi nite variety of input signals and therefore an infinite variety of distorted outputs.
Taking advantage of advances in psychoacoustic understanding and using the analytical and modeling capabilities of computers, some new investigations are attempting to identify some of the underlying perceptual mechanisms and develop better test methods. Voishvillo (2006) provides an excellent overview of the past, present, and possible future of distortion measurements. Geddes and Lee (2003), Lee and Geddes (2003, 2006), and Moore et al. (2004) provide additional perspectives."
I remain unconvinced. Η ψυχοακουστική μας έχει σερβίρει πολλές φορές πατάτες νερόβραστες και ανάλατες, που απέκτησαν την ισχύν δόγματος, μέχρις ότου κάποιος να κάνει το κατάλληλο πείραμα;
http://www.cas.sc.edu/dean/news/2009...ic-Kunchur.pdf
Αυτό δεν σημαίνει ότι οι μετρήσεις παραμόρφωσης είναι η Λυδία Λίθος της ποιότητας. Μόνον ο επιστημολογικά αδαής θα έβγαζε τέτοιο συμπέρασμα.


Ως προς τον Toole, προφανώς αναφέρεσαι στο εξής απόσπασμα:
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