Abstract / scope
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.
ISO 16:1975Published
Acoustics — Standard tuning frequency (Standard musical pitch)
Acoustique — Fréquence d'accord normale (Fréquence musicale normale)