增量式光电编码器输出四分频脉冲计数，分别为A，B两路信号-Incremental optical encoder pulse count output frequency of a quarter, namely A, B two-way signal

光电编码器输出脉冲的几种计数方法，讲述了软件、硬件、软硬件结合时的计数效果。-Photoelectric encoder output pulse counting methods, tells the story of software, hardware, software and hardware combined with the count of effect.