电子信息工程-利用数字方法分析信号频谱及系统特性.docVIP

毕业论文（设计） 毕业论文 利用数字方法分析信号频谱 　　　　　　题　　目 及系统特性 指导教师 　　　　　　学生姓名 二O一四 年 四 月 二十 利用数字方法分析信号频谱及系统特性 摘 要 频谱是将号频虚数从频号频谱号些频号这号号频随着计电术的数号频谱发挥应个领频谱析 Using digital signal spectrum analysis method and system characteristics Abstract Spectrum analysis is expressed as a sinusoidal signal component or the imaginary component of the index of the superposition of different frequencies , i.e., the angle from the frequency analysis signal . Spectrum analysis , the amplitude of the sinusoidal signal and analyzes the signal which is superimposed sinusoidal signal obtained by frequency , the frequency analysis of the signal is constituted . With the development of computer and microelectronics technology , the use of digital signal spectrum analysis method has been applied to various fields and plays an important role . Digital signal spectrum analysis method is not only important to reveal the signal characteristics , mainly used for the periodic component of the identification signal , the signal processing means is also important . DFT is in the time domain and frequency domain are discrete Fourier transform , fast and suitable for numerical calculation algorithm is the use of a computer to achieve a common signal spectrum analysis article describes the use of mathematical tools to analyze the signal DFT spectrum of basic processes, spectrum analysis focuses on the causes of the formation process of the error and error analysis of the main measures to reduce the instances cited the spectral analysis of MATLAB environment to achieve the program by comparison with the theoretical analysis , explaining the presence of the signal spectrum use DFT spectrum analysis aliasing , spectral leakage and barrier effect , and the corresponding improvements. Keywords: spectrum analysis; numerical methods; MATLAB; discrete Fourier transform; 目 录 摘 要 i Abstract ii 绪 论 1 1 信号频谱的概念和应用 2 1.1 信号频谱的概念 2 1.2 信号频谱的应用及举例 3 1.2.1 应用范围 3 1.2.2 具