The SPLL consists of calculation frequency error, updating loop middle variable, and output control signal.

该锁相环由计算频率误差、更新环路中间变量、输出控制信号组成。

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Moreover, this algorithm is carries on under the closed-loop system, it can examine the component signal deviation that controls the object to reduce or correct output error.

另外，该算法是在闭环系统下进行的，它能够检测出信号的偏差，利用偏差信号对受控对象进行控制，以减小或纠正输出量的偏差。

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