基于单片机的软件滤波系统的设计 本科毕业论文.doc

本科毕业设计论文 基于单片机的软件滤波系统的设计 学生姓名：班 级：指导教师： 常州工学院 年 月  CHANGZHOU INSTITUTE OF TECHNOLOGY 毕 业 设 计 说 明 书 题目：基于单片机的软件滤波系统的设计 二级学院（直属学部）： 专 业： 班级： 学生姓名： 学号： 指导教师姓名： 职称： 评阅教师姓名： 职称： 年 月 摘 要 本文设计了一种基于AT89S52单片机，在时域上对信号进行滤波，去除干扰的软件滤波系统。系统通过A/D转换芯片TLC549把模拟信号转换成数字信号，数字信号通过单片机AT89S52进行软件滤波。去除干扰的方法有十种，一、限副滤波;二、中位值滤波法;三、算术平均滤波法；四、递推平均滤波法；五、中位值平均滤波法；六、递推中值平均滤波法；七、限幅平均滤波法；八、消抖滤波法；九、一阶滞后滤波法；十、加权递推平均滤波法。 在硬件电路设计中，在满足控制要求的前提条件下，尽可能将相关电路简化。在软件设计上主要对数据采样，键盘选择，液晶显示，数字滤波等方面作了详细的介绍。综合硬、软件设计，在反复调试和改进的基础上，完成了本课题。最后对本课题进行了总结。 关键词：软件滤波 ；单片机； LCD1602 ；TLC549 Abstract Digital filters with higher precision than analog filter, even can realize the latter in theory cannot achieve performance. as the integrated circuit costs continue to reduce, digital filter is becoming more and more common and has become such as radio, cell phones, stereo receivers such an important part of daily articles. This paper presents a digital filters with AT89S52,whith filtering the signal in time domain .The analog signals into digital signals through the A / D converter chip ,then Filtering software use AT89S52 .There are ten ways to remove the interference: First, the limit of Vice filter; Second, median filtering; Third, the arithmetic mean filter; four recursive average filter; five, median average filtering method; six recursive median average filtering method; VII Limiting average filtering method; eight debounce filter; September, the first order lag filter; ten, the weighted average filter recursive. The hardware circuit design, the premise of meeting the control requirements under the conditions of the relevant circuit simplified as much as possible. Mainly in the software design of data sampling, keyboard options, LCD display, digital filtering, etc. are introduced in detail.Integrated the design of hardware and software．de