华侨大学：《信号与系统》课程教学资源（PPT课件讲稿，机电版）DTF周期性证明

1. Continuous-time system 2. Discrete-time system

一、只有奇次分量；直流、偶次正弦分量为零 二、随谐波数增加幅值减小，相位恒等于－90°

6.1 The Magnitude-Phase Representation （ 幅度-相位） of the Fourier Transform

Chapter 8 Communication Systems Modulation : The general process of embedding an information -bearing signal into a second signal. Demodulation : Extracting the information-bearing signal. Modulation : Amplitude Modulation (AM) Frequency Modulation (FM) Phase Modulation (PM) Modulating

9.1 The Laplace Transform 1. The relationship 2. Region of Convergence（收敛域）

Let be a band-limited signal with then is uniquely determined by its samples if where

4.1 Representation of Aperiodic Signals :The Continuous-Time Fourier Transform

2.1 Discrete-time LTI Systems : The Convolution Sum （卷积和） 2.1.1 The Representation of Discrete-Time Signals in Terms of impulses

Chapter 1 Signals and Systems (1) A simple RC circuit Source voltage Vs and Capacitor voltage Vc (2) An automobile