全相位DFT FIR数字滤波器设计.doc

编 号： 审定成绩： 重庆邮电大学 毕业设计（论文） 设计（论文）题目：学院：学 生 姓 名 ：专 业 ：班 级 ：学 号 ：指 导 教 师 ：答辩组 负责人 ：填表时间：年月 重庆邮电大学数字信号处理的是对真实世界的连续模拟信号进行。因此在进行数字信号处理之前需要将信号从模拟域转换到数字域，这通常通过模数转换器实现。而数字信号处理的输出经常也要变换到模拟域，这是通过数模转换器实现的。数字信号处理的核心算法是离散傅立叶变换(DFT)是DFT使信号在数字域和频域都实现了离散化从而可以用通用计算机处理离散信号。DFT/FIR滤波导出了一种新型的零相位滤波器(全相位DFT数字滤波器，并分析了它与相应的DFT滤波响应向量之间的正、反变换公式，证明了这种滤波器的一些重要性质。全相位DFT方法兼有窗函数法和频率采样法的优点，是一种设计FIR滤波器的新方法，理论分析和模拟实验证实：总体性能优于传统方法，DFT数字滤波器除可用通常的卷积结构实现外，也可用一种直接频域网络实现，，， 【关键词】 DFT/FIR滤波全相位数据空间零相位滤波器全相位DFT数字滤波器ABSTRACT The digital signal processing is the effective ways and means to process the real world of continuous analog signal. Therefore, digital signal processing is required before carrying out the signal from the analog domain to the digital domain, this is usually achieved through the A/D. The digital signal processing often have to transform the output to the analog domain, which is through the D/A converter to achieve. The core digital signal processing algorithm is the Discrete Fourier Transform (DFT), DFT algorithm is the signal in the digital domain and frequency domain are realized discrete, general-purpose computer which can efficiently deal with discrete signals. Digital filter is an important part of digital signal processing, digital filters can be divided into IIR and FIR two categories. In this paper, the concept of all phase and, based on DFT / FIR filter derived a new type of zero-phase filter ( all phase DFT digital filter, the paper analyzes the impulse response and its corresponding DFT is between the filter response vector, inverse transform formula. proved some important properties of this filter, all phase DFT method for both the window function method and frequency sampling method has the merit of a new method of designing FIR filters, theoretical analysis and simulation results confirmed: the general better performance than traditional methods, all phase DFT addition t