DSP 4ed [Proakis-Manolakis] 数字信号处理-Chapter 8.pdf
文本预览下载声明
Chapter 8
8.1
j 2π k N j 2πk j 2π k N j 2π k th
Since (e N ) = e = 1, e N satisfies the equation X = 1. Hence e N is an N root
N −1 j 2π kn j 2π ln
of unity. Consider n=0 e N e
显示全部