2 BIT 自适应差分编解码（ADPCM）程序，用于音频编码压缩和解码，功能不错！,GOOD！

2bit语音adpcm编码算法，适用于仅需要记录通话内容，不保证音质的场合。-The 2bit voice adpcm coding algorithm, applies only need to record conversations, does not guarantee the sound quality of the occasion.