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从滤波器的系数敏感度角度 ,提出一种基于全通滤波器的 IIR陷波器来抑制信号中的周期性干扰。该滤波器是由全通滤波器的级联构成的 ,因为全通滤波器传递函数的分子和分母多项式之间的镜像对称关系 ,该滤波器可以用高效的格型运算结构来实现 ,并且具有很低的系数敏感度 ,使得系数量化后的陷波频点偏移量最小。本文详细论述了该陷波器的设计方法 ,并深入分析了其在低频段的系数敏感度问题。通过实际数据验证了这种滤波器能够有效的抑制电力线通信信号中的谐波干扰。
From the perspective of the coefficient sensitivity of the filter, an all-pass filter-based IIR notch filter is proposed to suppress the periodic interference in the signal. The filter consists of a cascade of all-pass filters because of the mirror symmetry between the numerator of the all-pass filter transfer function and the denominator polynomial, which filter can be implemented with an efficient lattice operation structure and has The low coefficient sensitivity makes it possible to minimize the frequency offset of the notch after quantization. This paper discusses in detail the design method of the notch filter, and analyzes its coefficient sensitivity in the low frequency band. The actual data verify that this filter can effectively suppress harmonic interference in power line communication signals.