主要是通过Altera公司的Cuclone系列的FPGA-EP1C3T144C8产生余弦波的源代码 基于LPM-ROM余弦波一周期含有256个10位数据；-Mainly through Altera s Cuclone series of FPGA-EP1C3T144C8 cosine wave generated source code based on the LPM-ROM cosine wave of one cycle containing 256 10-bit data