信号与系统(第2章 节 信号的时域分析).pptVIP

第2章;Chap.2 Time-Domain Representations信号的时域分析;Chap.2 Time-Domain Representations信号的时域分析;2.1 Time-Domain Description of Continuous-Time Signals连续时间信号的时域描述;Basic Continuous-Time Signals典型连续信号;f (t)＝ A sin (ωt +φ) , t∈R ;按指数衰减的正弦信号 Exponentially damped sinusoidal Signals ;虚指数信号(Imaginary Exponential Signals);f (t)＝ e jω t , t∈R ;3、复指数信号 (Complex Exponential Signals, Eternal Signals);f (t)＝ A e s t , t∈R s=σ+jω;f (t)＝ A e s t , t∈R s=σ+jω;Definition:;二、奇异信号(Singularity Functions);利用阶跃信号表示矩形脉冲;利用阶跃信号表示矩形脉冲;利用阶跃信号的单边性表示信号的时间范围;2、单位冲激信号(Unit impulse Signals );3) 冲激信号的图形表示;三角脉冲;5) 冲激信号的性质(Properties of Unit Impulse);(2) 取样特性（积分取样）;(3) 展缩特性（尺度变换）Time Scaling;(4) 卷积特性（卷积取样）;(5) 冲激信号与阶跃信号的关系;r (t) ＝ { ;[例] 写出图示信号的时域描述式。; t;冲激偶信号具有与冲激信号相似的取样特性和展缩特性。;Relations of Impulse Function, Unit Function and Ramp function四种奇异信号之间的微积分关系;Chap.2 Time-Domain Representations信号的时域分析;2.3 Basic Operations of CT Signals连续时间信号的基本运算;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;2.3 Basic Operations of CT Signals;Chap.2 Time-Domain Representations信号的时域分析;2.2 Time-Domain Description of DT Signals (离散时间信号的时域描述);一、离散时间信号的表示;一、离散时间信号的表示;二、基本离散序列;二、基本离散序列;二、基本离散序列;二、基本离散序列;二、基本离散序列;二、基本离散序列;二、基本离散序列;二、基本离散序列;二、基本离散序列; ;Chap.2 Time-Domain Representations信号的时域分析;2.4 Basic Operation of DT Signals离散时间信号的基本运算;1;1;3、尺度变换（样本个数减少和增加）;3、尺度变换（样本个数减少和增加）;4、相加与相乘(Addition Multiplication);4、相加与相乘(Addition Multiplication);5、差分——Difference;6、求和（累加）——Sum;Chap.2 Time-Domain Representations信号的时域分析;2.5 Decomposition of Deterministic Signals确定信号的时域分解;2.5 Decomposition of Deterministic Signals;直流;2、To odd even Components;2、To odd even Components;3、To real part imaginary part Components;4、CT To linear composition of impulse Sign