脉冲编码调制程序，采用A律和u律，可在GUI中显示变换前后波形区别并播放声音。-A Pulse Code Modulation program based on A-law and u-law. Can display in the GUI waveform before-and-after difference and play the sound.

均匀PCM量化和u律非均匀量化的对比效果分析实验 不错的(Uniform law PCM quantization and u good non-uniform quantitative analysis of the contrast experiment)