This standard was last reviewed and confirmed in 2022. Therefore this version remains current.
Specifies the frequency for the note A in the treble stave and shall be 440 Hz. Tuning and retuning shall be effected by instruments producing it within an accuracy of 0,5 Hz.
Status: PublishedPublication date: 1975-01
Edition: 1Number of pages: 1
Technical Committee: ISO/TC 43 Acoustics
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