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本文研究了用市电线路传输低频报警信号的接口装置——分离滤波器 .该滤波器能滤掉 2 2 0伏的工频信号 ,而让低频信号通过 ,获得了实用新型专利 .
In this paper, the interface device - the separation filter which transmits the low-frequency alarm signal by the utility line is researched.The filter can filter out the power frequency signal of 220V and let the low-frequency signal pass, and obtained the utility model patent.