电子科大讲义课堂 信号ch1.pptVIP

Signals Systems Second Edition 讲授者：电子工程学院 孔斌 * 课程说明 参考书目: 《信号与系统分析》 吕幼新 张明友 电子工业出版社 《信号与系统分析》 闵大镒 朱学勇 电子科技大学出版社 课件下载: 校园网 教师社区 电子工程 学院 孔斌 课件发布 下载密码: 2007 Chapter 1 Signals and Systems § 1.1 Basic Discrete-Time Signals § 1.1.1 The Discrete-Time Unit Impulse and Unit Step Sequences Unit Impulse n=0 0 n ≠ 0 Unit Step n ≥ 0 0 n0 Sifting property ① Chapter 1 Signals and Systems ② Sampling property Chapter 1 Signals and Systems § 1.2 Basic Continuous-Time Signals § 1.2.1 The Continuous- Time Unit Step and Unit Impulse Functions 1. Unit Step Function t 0 0 t 0 0 t 1 ② 0 t ≠ 0 ① 2. Unit Impulse Function 0 t (1) ③ 0 τ 积分区间 0 τ 积分区间 Chapter 1 Signals and Systems § 1.2.2 The Properties of Unit Impulse Functions 1. Sampling and Sifting properties If f(t) is continuous at the point of t=0 ① Sampling property ② Sifting property In General Scaling property If a is real, a ≠ 0 Specially a=-1 —— Even function Chapter 1 Signals and Systems 4. Properties of Unit Doublets （冲激偶的性质） 3. Defining For any ① ② ③ Chapter 1 Signals and Systems § 1.2.3 Continuous-Time Complex Exponential and Sinusoidal Signals ① ② Chapter 1 Signals and Systems ③ General Complex Exponential Signals §1.3 Transformations of the independent variable Time shift Time reversal Time- scaling Even and Odd Signals Differential and Integral Chapter 1 Signals and Systems Example 1.1 Given the signal x( t) → x(-3/2 t+