基于单片机的数字滤波器设计.doc

基于单片机数字滤波器设计 摘 要 数据采集又称数据获取，是利用一种装置，从系统外部采集数据并输入到系统内部的一个接口。数据采集技术广泛应用在各个领域。比如摄像头，麦克风，都是数据采集工具。被采集数据是已被转换为电讯号的各种物理量，如温度，水位，风速，压力等，可以是模拟量，也可以是数字量。在互联网行业快速发展的今天，数据采集已经被广泛应用于互联网及分布式领域，数据采集领域已经发生重要变化。而在数据采集中存在各种噪声。滤除噪声的方法有很多种，既有数字滤波器，也有模拟滤波器。本文采用了基于单片机和c语言来设计并开发数字滤波系统。针对于单片机数据采集系统中经常出现的随机干扰，通过交流信号发生器输入来模拟数据采集过程，验证了几种使用较为普遍的克服随机干扰的单片机数字滤波算法，并给出了相应的c程序，同时也对这几种滤波算法进行了比较，并指出每一种算法具体适用范围和注意事项。另外本文使用了proteus进行仿真验证这几种滤波方法，用了AD和DA来采集及输出数据。 关键词 单片机/proteus/数字滤波。 BASED ON SCM DIGITALFILTER DESIGN ABSTRACT Data acquisition, also called data acquisition is the use of a device from the system input to external data collection and an interface that internal system. Data collection technology is widely quoted in various fields. Such as cameras, microphones, are data acquisition tools. Are collected data has been converted to telecommunications number of various physical quantities such as temperature, pressure, water, wind speed, etc, can be analogue, also can be the digital quantity. In the Internet industry fast development today, data acquisition has been widely used in Internet and distributed field, data acquisition field has changed in important changes. And in data acquisition exist in all sorts of noise. Filter out the noise a variety of ways, both digital filters, also have simulation filter. Here we adopted based on SCM and C language to design and develop digital filtering system. We based on single-chip microcomputer data acquisition system often appears in the random disturbance, through the manual input to simulate data acquisition process, and verifies the several use common overcome random disturbance single-chip digital filtering algorithm, and presents the corresponding C program, especially for the median value filter and the median value average filtering algorithm procedures were improved. Also on this compares several filtering algorithm, and points out the concrete each kind of algorithm is applicable range and precautions. In addition we use the simulation test