Pitch value - Onteichi

Japanese: 音程値 - おんていち
Pitch value - Onteichi

…The tuning used in music has evolved in pursuit of a balance between theoretical consistency and practical requirements. The absolute pitch of a musical note is determined by the number of vibrations per unit of time (usually one second), but since tuning is concerned only with the interrelationships between notes, the absolute value of the number of vibrations is not important, and the ratio of the vibrations (pitch ratio) or its logarithm (pitch value) is used to express the tuning. Pure pitch ratios are obtained by harmonic division of the string length. If the initial string length is 1, dividing it in half gives an octave, harmonically dividing the octave (1:2) gives a perfect fifth (2:3) and a perfect fourth (3:4), harmonically dividing a perfect fifth gives a major third (4:5) and a minor third (5:6), and harmonically dividing a major third gives a great whole tone (8:9) and a minor whole tone (9:10). …

*Some of the terminology explanations that mention "pitch value" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…音楽で実用された音律は,理論的整合性と実践的要求との調和を求めて変遷してきたといえる。楽音の絶対的な高さは単位時間(通常は1秒を単位とする)内における振動数によって決まるが,音律はあくまで音の相互関係を問題とするので,振動数の絶対値は重要でなく,音律の表示には振動数の比(音程比),またはその対数値(音程値)が用いられる。純正な音程比は弦長の調和分割によって得られ,最初の弦長を1とすると,それを2等分してオクターブが,オクターブ(1:2)を調和分割して完全5度(2:3)と完全4度(3:4)が,完全5度の調和分割によって長3度(4:5)と短3度(5:6)が,長3度の調和分割によって大全音(8:9)と小全音(9:10)が得られる。…

※「音程値」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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