4.2   周期信号的傅里叶变换                                        
4.3   连续时间傅里叶变换的性质                                    
4.3.1  线性                                                    
4.3.2  时移性质                                                
4.3.3  共轭及共轭对称性                                         
4.3.4  微分与积分                                               
4.3.5  时间与频率的尺度变换                                     
4.3.6  对偶性                                                   
4.3.7  帕斯瓦尔定理                                             
4.4   卷积性质                                                     
4.4.1  举例                                                     
4.5   相乘性质                                                     
4.5.1  具有可变中心频率的频率选择性滤波器                       
4.6   傅里叶变换性质和基本傅里叶变换对列表                         
4.7   由线性常系数微分方程表征的系统     
                         
第五章    离散时间傅里叶变化
5.0   引言                                                         
5.1   非周期信号的表示：离散时间傅里叶变换                         
5.1.1  离散时间傅里叶变换的导出                                 
5.1.2  离散时间傅里叶变换举例                                   
5.1.3  关于离散时间傅里叶变换的收敛问题                         
5.2   周期信号的傅里叶变换                                         
5.3   离散时间傅里叶变换的性质                                     
5.3.1  离散时间傅里叶变换的周期性                               
5.3.2  线性                                                     
5.3.3  时移与频移性质                                           
5.3.4  共轭及共轭对称性                                         
5.3.5  差分与累加                                               
5.3.6  时间反转                                                 
5.3.7  时域扩展                                               
5.3.8  频域微分                                               
5.3.9  帕斯瓦尔定理                                           
5.4   卷积性质                                                   
5.4.1  举例                                                   
5.5   相乘性质                                                   
5.6   傅里叶变换性质和基本傅里叶变换对列表