A(A-sharp)是A的一个半音之上,B的一个半音之下。因此,AB异名同音。A在法语里是第十一个唱名,称为lá dièse

十二平均律中,如果中央C之上的A频率是440Hz,那C4中央C之上的A)的频率就是大约466.16 Hz。(参见音高。)

十二律

A十二律中对应无射

参见


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