差分格式中的一种类型，matlab编程实现的，能看到明显效果。-difference format of a type, Matlab programming, and be able to see tangible results.

三次差分编码 和一次LZW压缩matlab源码，绝对正确，而且压缩率很高，80 以上，要是有不懂的，可以咨询我。-This is a realisation of lzw compression.If you have some problems ,you can contact with me.

语音压缩 自适应差分脉冲调制编码 即ADPCM 用matlab开发 -Adaptive differential pulse-modulated voice compression coding using matlab development that ADPCM