$${\displaystyle {\int }_{-1/2}^{1/2}{\left|W（f）\right|}^2}df＝{\displaystyle \underset{n}{\sum }{\left|w（n）\right|}^2}．$$

$${\left|W（0）\right|}^2＝{\left|{\displaystyle \underset{n}{\sum }w}（n）\right|}^2．$$

$$\frac{{\displaystyle {\int }_{-1/2}^{1/2}{\left|W（f）\right|}^2}df}{{\left|W（0）\right|}^2}＝\frac{{\displaystyle \underset{n}{\sum }{\left|w（n）\right|}^2}}{{\left|{\displaystyle \underset{n}{\sum }w}（n）\right|}^2}．$$

$$\text{ENBW}＝f_{\mathrm{年代}}\frac{{\displaystyle \underset{n}{\sum }{\left|w（n）\right|}^2}}{{\left|{\displaystyle \underset{n}{\sum }w}（n）\right|}^2}．$$

$$\text{ENBW}＝N\frac{{\displaystyle \underset{n}{\sum }{\left|w（n）\right|}^2}}{{\left|{\displaystyle \underset{n}{\sum }w}（n）\right|}^2}．$$