What Is Standard Pitch?

- Jun 20, 2018-

In 1975, the International Organization for Standardization (ISO) formally adopted the corresponding 440 Hz of the pitch notes A as the international audio standard, namely the standard pitch or the international standard pitch. On a regular piano keyboard, the sequence of sounds from any tone up to octaves higher than it is called "group". The small-character group A tune “1” corresponds to a frequency of 440 Hz, which is often used to tune.



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