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A (音名).
A或者la是唱名的第六个音。A是用来调音的,当管弦乐团调音时,会叫双簧管吹A,其他乐器则听这音来调音;中乐团则是以笙的标准音调音。
当计算十二平均律时,以A4(中音A)为标准,设定为440 Hz(参见音高的相关讨论)。升一个半音时,频率乘以
。
A0是钢琴键盘上最低的音。而A7和C8(钢琴键盘上最高的音)很接近。
不同八度上的A音
科学记音法
|
亥姆霍兹记音法
|
频率 (Hz)
|
A9
|
a′′′′′′
|
14080
|
A8
|
a′′′′′
|
7040
|
A7
|
a′′′′
|
3520
|
A6
|
a′′′
|
1760
|
A5
|
a′′
|
880
|
A4
|
a′
|
440
|
A3
|
a
|
220
|
A2
|
A
|
110
|
A1
|
A͵或͵A
|
55
|
A0
|
A͵͵或͵͵A
|
27.50
|
A−1
|
A͵͵͵或͵͵͵A
|
13.75
|
由A开始的调
- A大调:A B C♯ D E F♯ G♯ A
- A小调
- A自然小调:A B C D E F G A
- A和声小调:A B C D E F G♯ A
- A旋律小调:A B C D E F♯ G♯ A G F E D C B A
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