基于分段组合复调制高斯函数的多通带滤波器设计

摘要

针对数字信号处理中的滤波器设计问题，提出了一种多通带数字滤波器设计方法，即通过分段组合复调制将具有不同中心频率的高斯函数进行时域叠加，使其逼近任一多通带数字滤波器的幅频特性，最后通过实例验证了该方法的有效性和实用性。结果表明：通过灵活选择形状参数、频移，可以设计出性能良好的特殊用途滤波器。%In view of the problem of filter design in digital signal processing,a method of multi-band-pass digital filter design is put forward.The method can approach any amplitude frequency characteristic of multi-band-pass digital filter by splicing sectional combined complex modulated Gaussian function in time domain.At last,the validity and practicability of the method is validated by examples.The result shows that filter with special application and excellent performance can be designed to take as a choice of shape parameter and frequency-shifting.