抽头式交指带通滤波器的优化方法研究及仿真

摘要

The low frequency of gaussian noise filtration problems was researched. For digital signals are mixed with a lot of low frequency noise, the traditional filter method cannot be accurately controlled, and the control valve values fluctuate frequently. In order to solve this problem, this paper proposed a tap type into a bandpass filter algorithm , used two terminals of the external quality factor Q and resonator coupling coefficient K in the design, refered tap into a bandpass filter algorithm, and used iteration points frequency filter method for the higher precision of filtration ultralow frequency gaussian noise, the disadvantage that the traditional methods rely on threshold were overcome . Simulation results show that the method can filter ultralow frequency gaussian noises better and achieve satisfactory results.%研究滤波器超低频噪声的过滤优化问题.针对数字信号中混有大量超低频噪声的情况下,传统的等效电路过滤方法无法准确控制输入输出公差精度,控制阀值存在较大波动,造成过滤效果不理想.为了解决上述问题,提出了一种抽头式交指带通滤波算法,利用两终端的外部品质因数Q和谐振器间的耦合系数K设计抽头式交指型带通滤波算法,运用迭代分频滤波方法,高精度的过滤超低频高斯噪声.克服传统方法依赖阀值的弊端.仿真结果表明,抽头式方法能较好的过滤超低频高斯噪声,取得了满意的结果.