电子科大-信号与系统课件chap2.ppt

Chapter 2 LTI Systems 6 几种典型系统 ① 恒等系统 ② 微分器 ③ 积分器 ④ 延迟器 ⑤ 累加器 Chapter 2 LTI Systems §2.3.4 LTI Systems with and without Memory 1. Discrete-time System It is memoryless An LTI system without memory 2. Continuous-time System An LTI system without memory Chapter 2 LTI Systems §2.3.5 Invertibility of LTI Systems LTI系统的可逆性 System Inverse System identity system (恒等系统） Chapter 2 LTI Systems §2.3.6 Causality for LTI Systems LTI系统的因果性 1. Discrete-time System 与n时刻以后输入有关 Causal system 2. Continuous-time System Causal system Chapter 2 LTI Systems Consider a linear system Causal Initial Rest (初始松弛） For any time t0 §2.3.7 Stability for LTI Systems (稳定性） 1. Discrete-time System Chapter 2 LTI Systems Stable System 2. Continuous-time System absolutely Summable 绝对可加 Stable System ① The system is stable. ② absolutely Integrable 绝对可积 The system is not stable. Chapter 2 LTI Systems §2.3.8 The Unit Step Response of an LTI Systems LTI系统的单位阶跃响应 Discrete-time System Continuous-time System Unit Step Response Unit Step Response Chapter 2 LTI Systems §2.4 Singularity Functions (奇异函数） §2.4.1 The Unit Impulse as an Idealized Short Pulse 0 △ t 0 2△ t Chapter 2 LTI Systems Example 2.16 Chapter 2