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§8.9 序列的傅里叶 变换(DTFT)

§8.9 序列的傅里叶 变换(DTFT). 一.定义. DTFT:Discrete-time Fourier transform. 为研究离散时间系统的频率响应作准备,从抽样信号的傅里叶变换引出:. 与 z 变换之关系. 逆变换. 表示. 二.傅氏变换、拉氏变换、 z 变换的关系. 1. 三种变换的比较. 2. 频率的比较. 3. s 平面虚轴上的拉氏变换即为傅氏变换. 4. z 平面单位圆上的 z 变换即为序列的傅氏变换( DTFT ). 变换名称. 傅里叶变换. 拉普拉斯变换. z 变换. 信号类型. 变量. 1 .三种变换的比较.

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§8.9 序列的傅里叶 变换(DTFT)

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  1. §8.9 序列的傅里叶变换(DTFT)

  2. 一.定义 DTFT:Discrete-time Fourier transform 为研究离散时间系统的频率响应作准备,从抽样信号的傅里叶变换引出:

  3. 与z变换之关系

  4. 逆变换 表示

  5. 二.傅氏变换、拉氏变换、z变换的关系 1.三种变换的比较 2.频率的比较 3.s平面虚轴上的拉氏变换即为傅氏变换 4.z平面单位圆上的z变换即为序列的傅氏变换(DTFT)

  6. 变换名称 傅里叶变换 拉普拉斯变换 z变换 信号类型 变量 1.三种变换的比较

  7. 2.频率的比较 模拟角频率 ,量纲:弧度/秒; 数字角频率 ,量纲:弧度; 是周期为 的周期函数 关系:

  8. 3.s平面虚轴上的拉氏变换即为傅氏变换 4.z平面单位圆上的z变换即为序列的傅氏变换(DTFT)

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