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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滤波器相比,阻带衰减提高20dB;同锐化CIC滤波器相比,阻带衰减提高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。
In order to solve the limitation of the large passband distortion and stopband attenuation of the cascaded integral comb (CIC) filter applied to the sampling rate conversion system, based on the analysis of the transfer function and spectral characteristics of the traditional CIC filter, Second-order adjustable parameters Simple filter design of a high-performance CIC filter. The simulation results show that the stopband attenuation increases by 20dB compared with the interpolated second-order polynomial CIC filter of the same level. The attenuation of the stopband is improved by 80dB compared with the sharp CIC filter, and the passband performance is greatly improved ; Implementation complexity is low. Therefore, it is suitable for the passband, stopband performance and high complexity of the sampling rate conversion system.