用matlab的m文件编写的编码器初步仿真，实现了正余弦波、方波，以及脉冲计数和四倍频脉冲计数，初步实现了编码器的初步模型。-With matlab m-file write encoder preliminary simulation, to achieve a positive cosine wave, square wave, and pulse count and quadruple pulse count, the initial realization of preliminary