标准摘要
[中文适用范围]： 指定高音五线谱中音符 A 的频率，应为 440 Hz。 调谐和重调谐应通过精度为 0.5 Hz 的仪器进行。 [外文原描述]： 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.
英文名称Acoustics — Standard tuning frequency (Standard musical pitch)