DSP实训论文-使用MatlabGUI设计RC带通滤波器的设计.doc

摘要
滤波器的功能是让一定频率范围内的信号通过,而将此频率范围之外的信号加以抑制或使其急剧衰减。当干扰信号与有用信号不在同一频率范围之内,可使用滤波器有效的抑制干扰。数字滤波器是数字信号处理的基础,用来对信号进行过滤、检测与参数估计等处理,在通信、图像、语音等许多领域有着十分广泛的应用,尤其在图像处理、数据压缩等方面取得了令人瞩目的进展与成就。鉴于此,数字滤波器的设计想得尤为重要
用LC网络组成的无源滤波器在低频范围内有体积重量大,价格昂贵和衰减大等缺点,而用集成运放和RC网络组成的有源滤波器则比较适用于低频,此外,它还具有一定的增益,且因输入与输出之间有良好的隔离而便于级联。由于大多数反映生理信息的光电信号具有频率低、幅度小、易受干扰等特点,因而RC有源滤波器普遍应用于光电弱信号检测电路中。作为强大的计算软件, Matlab提供了编写图形用户界面的功能。所谓图形用户界面, 简称为GUI, 是由各种图形对象, 如图形窗口菜单按钮、文本框等构建的用户界面。
MATALB 可以创建图形用户界面GUI ( GraphicalUser Interface) ,它是用户和计算机之间交流的工具。Matlab 将所有GUl 支持的用户控件都集成在这个环境中并提供界面外观、属性和行为响应方式的设置方法,随着版本的提高,这种能力还会不断加强。而且具有强大的绘图功能,可以轻松的获得更高质量的曲线图。
本次实训就是使用MatlabGUI设计RC带通滤波器的设计。
关键词:MATLAB;GUI;IIR滤波器;FIR滤波器

Abstract
The function of the filter is to make certain frequency range of signal through, and the frequency of the signal beyond curbed or their sharp attenuation. When the disturbance signal and the useful signal is not the same frequency range, can use filter to suppress the interference effectively. Digital filter is the basis of digital signal processing, used to signal filtration, detection and parameter estimation processing, munication, image, sound, and many other areas has a very wide range of applications, especially in the image processing, pression and has achieved remarkable progress and ess. In view of this, the design of the digital filter to be particularly important
With work consisting of passive filter in the low frequency worldwide volume weight big, expensive and attenuation ings, but with integrated op-amp and work consisting of active filter is more applicable to low frequency, in addition, it also has some of the gain, and because between input and output has good isolation and facilitate cascade. Since most reflect the photoelectric signal has a physiological information low frequency and amplitude small, vulnerable to interference and other characteristics, thus RC active filters widely applied electric light weak signal detection circuit. As a powerful calculation software MATLAB