[信息与通信]北京交通大学信号与系统ch3.ppt

Ch3 Fourier representations of signals and Linear Time-Invariant Systems（信号与LTI系统的傅里叶表示） Ch3.1 Introduction Ch3.2 Complex Sinusoids and Frequency Response of LTI System（复正弦信号和LTI系统的频率响应） Ch3.3 Fourier Representations for Four Classes of Signals（ 4种信号的傅里叶表示） Fourier Representations for Four Classes of Signals Ch3.4 离散周期信号的傅里叶级数 （Discrete-Time Fourier Series: DTFS) DTFS pairs（ DTFS对） Ch3.5 连续周期信号的傅里叶级数 （Continuous-Time Fourier Series: CTFS) Ch3.6 离散时间非周期信号的傅里叶变换 （Discrete-Time Fourier Transform: DTFT) Spectra of exponential signals The spectrum of Rectangular pulse Inverse DTFT of A Rectangular Spectrum DTFT of A unit impulse Inverse DTFT of A Unit Spectrum Ch3.7 连续时间非周期信号的傅里叶变换 （Fourier Transform--FT) Ch3.8 傅里叶分析的性质 (properties of Fourier Represents) Ch3.8 周期性（Periodicity） 周期性（Periodicity） Ch3.9 Linearity and Symmetry(线性与对称特性) Representation of a step function as the sum of a constant and a signum function. Symmetry Properties: Real and Imaginary Signals Ch3.10 Convolution Property(时域卷积) Ch3.11 Differential and Integration Property(时域微分和积分特性) Ch3.11.3 Integration Property(积分特性) Ch3.12.1 Time-Shift Property (时移特性) Time-Shift Property (时移特性) Application of the time-shift property. Ch3.12.2 Frequency-Shift Property（频移特性） Frequency-Shift Property（频移特性） Ch3.13 Finding Inverse Fourier Transform by Using Partial-Fraction Expansions（部分分式法求傅里叶反变换） Ch3.13.2 Inverse Discrete-Time Fourier Transform（由X(ej?)求x(n)） Ch3.14 Multiplication Property（时域相乘） Application：Amplitude modulation（幅度调制） Application：Amplitude modulation（幅度调制） Ch3.15 Scaling Properties（尺度展缩） Ch3.16 Parseval Relationships （帕斯瓦尔定理） Ch3.17 Time-Bandwidth Product（时间带宽积） Ch3.18 Duality （对称互易特性） Frequency Representations of LTI Systems （LTI 系统的频域描述） Frequency Response of LTI System (LTI系统的频率响应) Ch3.10.2 Filtering ( 滤波) Frequency Response of LTI System Representations and Solutions of LTI Systems in Frequency Domain （LTI 系统的频域描述和求解） Ch8.1 Conditions of Distorionless Transmission(无失真传输系统的条件)