Assertion: tone | /r/CapableOf | depend upon sound pressure
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Source sentences:
text: Acoustical Terminology definition 12.09 of timbre describes it as "that attribute of auditory sensation which enables a listener to judge that two nonidentical sounds, similarly presented and having the same loudness and pitch, are dissimilar", adding, "Timbre depends primarily upon the frequency spectrum, although it also depends upon the sound pressure and the temporal characteristics of the sound" (Acoustical Society of America Standards Secretariat 1994).