说明：  将10Khz的输入信号经过分频得到两路互补的方波信号，方波信号的频率由分频计数初值决定。然后将分频后的方波进行移相，从而得到另外两路方波信号，移相的大小也由计数器的的初值决定。
(After the 10Khz frequency input signals are two complementary square wave signals, square wave signal frequency by a frequency count of initial decision. And then divided by the square wave phase shift, resulting in another two square wave signals, phase shift of the size of the initial decision by the counter.)