数字滤波器的实时执行与仿真入门

在学习和应用数字信号处理技术时，如何有效地利用各种仿真软件取决于使用者对有关原理的理解。针对当前教学中的薄弱环节和应用的需要，本文借助仿真阐述了数字滤波器实时执行的基本原理，重点说明了延时、状态变量描述和仿真编程的方法。所涉及的基本概念也是采用可编程DSP芯片或专用数字硬件实现高速实时处理所必需的。利用MATLAB软件对一个理想的数字余弦振荡器进行了仿真。

The Introduction to Real-time Implementation and Simulation of Digital Filters

While learning and applying digital signal processing, how we use simulation software efficiently depends on the user's understanding to the principles. In view of the weak link in present courses and the requirement in application, the paper illusrates the basic principles of real-time implementation of digital filters by simulation. The emphasis is placed on interpreting time delay, state varibable descripion and simulation method. These basic conceptions are necessary to implement high speed real-time processing with programmable DSP chip or special-purpose digital hardware. A simulation example is given with an idea digital cosinusoid ocillator in MATLAB.