摘要本文首先介绍了数字滤波器的应用和发展前景,其中对FIR数字滤波器的原理和设计方法进行了详细说明。FIR数字滤波器具有线性相位和稳定性的优点。当前,常用的FIR数字滤波器设计方法主要有窗函数法,频率采样法,最优等波纹设计法。本论文主要介绍了基于最速下降法设计FIR数字滤波器的原理和过程。该设计方法的核心是在给定的通带和阻带内使最大逼近误差最小,从而构建FIR滤波器单位脉冲响应的迭代寻优公式。分别对阶数和步长两个参数对误差的影响进行了详细分析。最后,给出了基于最速下降法和其他常用方法设计的FIR滤波器性能参数的比较,结果验证了设计方法的有效性。5772
关键字 FIR数字滤波器;最速下降法;窗函数法;频率采样法;最优等波纹法
毕业设计说明书(论文)外文摘要
Title FIR Digital Filter Design based on Steepest Descent Method
Abstract
This paper analyzes the application and development prospect of the domestic and international digital filtering technology, which introduced the principle and design method of FIR digital filters. FIR digital filters has linear phase and stability advantages. At present, the common design of FIR digital filter has window function method, frequency sampling method, optimal equiripple design method. This paper describes the principle and algorithm of the steepest descent method design FIR digital filter, the steepest descent method of the core is within the scope of the control error function iteration, respectively, consider the order and step on the error. Finally, the steepest descent method design and common method for FIR filter design index analysis.
Keywords FIR digital filters; the steepest descent method; window function method; frequency sampling method; optimal equiripple design method
目 次