Abstract
The present writer insists that, as a fundamental matter, "noise" belongs to the category of "natural sounds" and "voice and phoneme" to the line of "speech sounds", in another words that the former is the concrete, outward, physical phenomena while the latter is the abstractive, inward, psychological image. The main reason of these discrimination comes from:1) the existence or non-existence of "contents", i. e. , "linguistic meaning" in the background of sounds. 2) the establishment or non-establishment of "auditory conventions" which often allows to cause some distortions of sounds or so called phonetic changes. 3) "natural sounds" are, as its nature, universal or international but "speech sounds" are limited to national or individual language. Anyway, there is no existence of "sounds" itself besides the existence of man, or more exactly the existence of ears, in the world. Even the most scientific experiment of acousticians would have to employ the judgement of auditory organs at its last stage.
