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这个matlab程序是用周期循环检测算法检测：首先运行a.m程序，通过此程序运算得出循环频率a值；再运行zhouqi.m程序，对a值进行确定，通过周期循环算法对信号进行检测；

-Hello: This procedure is used matlab cycle detection algorithm: First run a.m program, obtained through the operation of this procedure cyclic frequency of a value　to run zhouqi.m procedures, a value determined by the signal cycle algorithm detection