说明：  此代码为将ADPCM数据转换为线性PCM的程序源码源代码，该该程序源码经验证可用，已经用于我实验室的产品中。 可直接使用。
(This code for ADPCM data is converted to linear PCM source of program source code, the program source proven available, has been used in my laboratory products. Can be used directly.)