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对高于香农频率的工频及倍频干扰信号，本文提出了利用程序查找其干扰频率的数字递推滤波方法进行滤波，并将它应用到ＷＹ－２型钢水测温定氧智能仪中，从而有效地解决了抗工频及倍频干扰信号的问题。
For power frequency and frequency doubling interference signals higher than Shannon frequency, this paper proposes a digital recursive filtering method using program to find out the interference frequency and applies it to the WY-2 molten steel temperature and oxygen analyzer, Thus effectively solve the anti-frequency and frequency doubling interference signal problems.