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

4.3 4.4 4.10 4.11 4.14 4.15 4.24 4.25 4.32 4.35 4.36 4.37 4.43

3.1 3.13 3.15 3.34 3.35