有限冲击响应数字滤波器FIRDF系统设计

介绍基于快速傅立叶变换ＦＦＴ、褶积镶边理论以及线性相位理论所开发出的ＦＩＲ数字滤波系统及工作原理。成功开发出的ＦＩＲ数字滤波系统在数字信号处理的专业应用上，对连续信号能高效地进行数字高通、数字低通、数字带通及数字带阻四种功能的滤波处理，系统设计所采用的优化分析和处理方法使其幅相频特性比较理想，从而保证输出信号在较高的精度上没有幅值和相位失真；在控制方式上具有比硬件控制及软硬结合控制较大的优越性：变参数输入的灵活性、分析结果系统内输出的多样性、面向对象应用软件使用上的友好性、可移植性、再开发性、可维护性、开发周期的高效性和费用的便宜性等。分析结果表用，ＦＩＲ数字滤波系统用于实际的滤波处理是稳定并且可靠的。

Designl of a Finite Impulse Response Digital Filter System

Finite impulse response digital filter system(FIRDFS)based on the theory of Fast Fourier Transformation,Convolution and Linear Phase is presented in the paper.FIRDFS has four types of function on the fast speed process of continuous signal:digital high pass,low pass,band pass and band reject.Optimum analysis and processing of system design makes the frequency characteristics of amplitude and phase relatively ideal,so as not to cause the distortion of output signal on amplitude and phase.The control mode based on pure software of FIRDFS has more advantages than those based on pure hardware or integration of software and hardware:the flexibility of variable parameter input,the diversity of output in the system,the convenience of the use of object-oriented application software,less expensive and efficient development,good property of transplanting,maintenance and redevelopment.Analysis shows the stability and reliability of FIRDFS in the practical filtering processing.