基于MATLAB的数字滤波器的设计摘要.doc

毕业设计说明书（论文）中文摘要

在这个极具挑战的时代中，把计算机充分运用到教学及工程计算中，显然具有重要的意义，而随着计算机技术的发展,计算机软件在工程设计领域的应用越来越广。
本设计要研究的是基于MATLAB的数字滤波器的设计。则是应用计算机软件进行编程。首先了解滤波器的基本工作原理，针对不同数字滤波器所采用最合适的设计方法，设计FIR和IIR数字滤波器，以达到效果最佳。FIR一般要求信号具有线性相位，而FIR数字滤波器则可实现严格的线性相位，同时由于脉冲响应为有限长，因此还具有永远稳定的特性，鉴于此FIR主要解决了线性相位和稳定性的问题,否则多用IIR数字滤波器来实现。根据这个特点设计FIR和IIR滤波器，利用窗函数来设计FIR数字滤波器；利用模拟滤波器来设计IIR数字滤波器。
滤波是信号处理中最基本又极为重要的技术，利用滤波器技术可以从复杂的信号中提取出所需要的信号，抑制不需要的信号。绝大多数传感器输出的信号，在使用过程中，都必须进行滤波。所以滤波器是具有一定传输选择特性的、对信号进行加工处理的装置、它允许输入信号中的一些成分通过，抑制或衰减另一些成分。其功能是将输入信号变换为人们所需要的输入信号。
本设计主要给出了FIR数字滤波器与IIR数字滤波器的设计方法和原理。

关键词 数字滤波器 MATLAB FIR IIR

毕业设计说明书（论文）外文摘要

Title Design of Digital Filter Based On Matlab

Abstract
In this very challenging time, making full use of computer teaching and engineering calculation, Obviously it is of great significance, and with the development of computer technology. Computer software in the areas of engineering design used widely.
The design study is based on MATLAB digital filter design. It is the application of computer software programming. Filter all know the basic principle for different digital filter used in the most suitable design method Design of FIR and IIR filter, in order to achieve the best effect. FIR signal is typically require linear phase FIR digital filter which can be achieved by strict linear phase, Moreover, the impulse response of the finite length, it will also have stable characteristics In view of this mainly to solve the FIR linear phase and stability of the problem, with more IIR digital filter is to be achieved. Based on the above features of the design FIR and IIR filters, using window function design FIR digital filter; simulations of IIR filter design digital filters.
The filter is in the signal processing the most basic extremelyimportant technology, may withdraw the signal using the filtertechnology from the complex signal which needs, suppresses signalwhich does not need. The overwhelming majority sensor outputs the signal, in the useprocess, all must carry on the filter. Therefore the filter is has the certain transmission choicecharacteristic, carries on processing processing to the signal theinstallment, it allows in the input signal some ingredients to pass,the suppression or weakens another some ingredients.Its function is the input signal transformation the input signal whichneeds for the people.
This design has mainly produced the FIR numeral filter and the IIR numeral filter design method and the principle.

Key Words Digital Filter Matlab FIR IIR