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2. Notion of height
This notion is relatively easy to define in the case of pure sound, for which a classification can be established without ambiguity between sounds differing in frequency. The ANSI (1960) definition is clear:
"Pitch is the attribute of auditory sensation according to which sounds can be arranged on a scale, such as a musical scale, from low to high", depending on whether their frequency is low or high, states the Afnor definition in 1977.
In the more general situation of complex sounds with an extended spectrum, the above definition creates difficulties in many cases.
In music, we know that matching sounds whose frequencies differ by a factor of 2 (an octave) is much easier than matching sounds that are much closer in frequency....
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