对电机的编码器输入的正交编码信号进行4倍频处理 ，生成一个新的计数脉冲 ，同时判断电机的转动方向，输出一个方向标志电平信号，从而可以让DSP知道电机的转速和方向。-On the motor encoder inputs of the quadrature encoder signals 4 octave treatment, generates a new pulse count and at the same time to determine the direction of motor rotation, the output level in one direction signs signal, so that we can let the DSP know the motor speed and direction.