根据Quartus导出stp文件导出的txt数据，把txt文档里的无关内容删除，仅保留数据，可使用该m程序，轻松画出频谱图，作为开发人员的测试工具(Export the txt data derived from the STP file according to Quartus, delete the irrelevant content in the txt document, only retain the data, use t