一个关于锁相环的介绍及码源，希望对于初学者有所帮助。分享给大家了！-Introduction of a phase-locked loop and the code on the source of hope for the beginners help. We share it!

通过借用MATLAB，输入信号及其参数，完成数字锁相，计算不同阶的谐波信号。(By MATLAB, input signal and its parameters, complete the digital lock phase and calculate the harmonic signals of different orders.)