# 汉明函数

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${\displaystyle 0.54+0.46\cos {\phi ,\quad -\pi <\phi <\phi }}$,
${\displaystyle 0,\quad \phi <-\pi {\text{ or }}\phi >\pi }$,

FIG. W-12. Windows in the time and frequency domains. (a) Window shapes in time-domain. (b) Spectral shapes. The effective width of the boxcar is greater than that for the other window shapes and hence the central lobe is sharper.