改进的高性能级联积分梳状滤波器

为解决应用于采样率变换系统中的级联积分梳状(CIC)滤波器通带失真大和阻带衰减小对其应用的限制,在分析传统CIC滤波器传输函数和频谱特性的基础上,引入二级可调参数简单滤波器,设计一种高性能CIC滤波器。仿真结果表明,它与同级数规模的内插二阶多项式CIC滤波器、锐化CIC滤波器相比,阻带衰减分别提高20dB、80dB;通带性能得到较大改善;实现复杂度较低。因此,它适用于对通带、阻带性能和实现复杂度要求较高的采样率变换系统。

Improved high performance cascaded integrator comb filter

Cascaded integrator comb(CIC) filters are widely used for sample rate conversion,but the large distortion of the pass band and the small attenuation of the stop band limit its applications.Two simple parameter-tuned filters are presented here for CIC filters based on the transition function and the characteristics of conventional CIC filters.Simulations show the stop band attenuation is 20 dB better than the interpolated second-order polynomials CIC(ISOP-CIC) and 80 dB better than the sharpening CIC(SCIC) of the same order.The pass band performance is also improved and the implementation is less complex.Thus,this design is well suited for speed-limited systems with sample rate conversion which require high performance pass bands and stop bands.