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本文讨论了软磁卡机读写、控制电路的设计及软磁卡机采用双频相位相干（P2F）数据记录方式的原理和软卡机与微机的接口
This article discusses the soft magnetic card reader and writer, the design of the control circuit and soft magnetic card machine using dual-frequency phase coherent (P2F) data recording principle and the soft card machine and the computer interface