中文说明：
频率固定且不变，通过IIR陷波器，设计谱线增强器。
English Description：
The frequency is fixed and constant, and the line enhancer is designed by IIR Notch filter.
Design of line enhancer by IIR Notch Filter with fixed frequency
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中文说明：
频率固定且不变，通过IIR陷波器，设计谱线增强器。
English Description：
The frequency is fixed and constant, and the line enhancer is designed by IIR Notch filter.