说明：  A-Law/U-Law/Linear格式相互转换:这个程序提供了在A-Law，U-Law和16位线性音频编码格式之间的转换算法，您可以在编译的时候选择采用快速查表算法还是节省存储空间的计算算法。
(A-Law/U-Law/Linear format conversion : This procedure provided in A-Law, U-Law and 16 linear Audio Coding format conversion between the algorithm, You can compile time to choose fast lookup table algorithm to save storage space or the calculation algorithm.)