DDC和DUC文档，介绍内容，不是代码文件，介绍的内容还可以-DDC and DUC document that describes the content, not code files, the contents can also be introduced

DDC/DUC. 上下变频使用，上板验证已通过，敬请使用。-DDC/DUC. up and down frequency conversion. On board verification can be used, please use