时移尺度举例For example2Given thatf (t)←→F( jω),findf (at – b) ←→ Ans:f (t – b)←→e -jωb F( jω)f (at – b) ←→orf (at) ←→f (at – b) =
时移尺度举例For example2Given thatf (t)←→F( jω),findf (at – b) ←→ Ans:f (t – b)←→e -jωb F( jω)f (at – b) ←→orf (at) ←→f (at – b) =
时移举例3求图(a)所示三脉冲信号的频谱。解: 因为脉冲个数增多,频谱包络不变,带宽不变。
时移举例3求图(a)所示三脉冲信号的频谱。解: 因为脉冲个数增多,频谱包络不变,带宽不变。
时移特性举例For example F(jω) = Ans:f1(t) = g6(t - 5) , f2(t) = g2(t - 5) g6(t - 5) ←→g2(t - 5) ←→∴ F(jω) =‖+
时移特性举例For example F(jω) = Ans:f1(t) = g6(t - 5) , f2(t) = g2(t - 5) g6(t - 5) ←→g2(t - 5) ←→∴ F(jω) =‖+
冲激信号尺度变换举例例1例2
冲激信号尺度变换举例例1例2
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尺度变换例1For example 1Ans:Using symmetry,so that,
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