利用DCT_LMS方法分别对锯齿波、方波、正弦波进行了滤波，滤波效果较好的恢复出了真实信号，相比单纯LMS滤波方法有了极大的提高。(The DCT_LMS method is used to filter the sawtooth wave, Fang Bo and sine wave. The real signal is recovered with better filtering effect, which has been greatly improved compared with the simple LMS filtering method.)