频率是每单位时间重复事件的发生数量。它是在赫兹（Hz）中测量的。
1 dec = 5 oct
1 oct = 0.2 dec
例子:
将15 十年转换为八度：
15 dec = 75 oct
| 十年 | 八度 |
|---|---|
| 0.01 dec | 0.05 oct |
| 0.1 dec | 0.5 oct |
| 1 dec | 5 oct |
| 2 dec | 10 oct |
| 3 dec | 15 oct |
| 5 dec | 25 oct |
| 10 dec | 50 oct |
| 20 dec | 100 oct |
| 30 dec | 150 oct |
| 40 dec | 200 oct |
| 50 dec | 250 oct |
| 60 dec | 300 oct |
| 70 dec | 350 oct |
| 80 dec | 400 oct |
| 90 dec | 450 oct |
| 100 dec | 500 oct |
| 250 dec | 1,250 oct |
| 500 dec | 2,500 oct |
| 750 dec | 3,750 oct |
| 1000 dec | 5,000 oct |
| 10000 dec | 50,000 oct |
| 100000 dec | 500,000 oct |
规则