使用VHDL语言，实现通信脉冲编码调制（PCM）的u律压缩。,Using VHDL language, the realization of communication pulse code modulation (PCM) of u law compression.

The DVI Adaptive Differential Pulse Code Modulation (ADPCM) algorithm was first described in an IMA recommendation on audio formats and conversion practices [1]. ADPCM is a transformation that encodes 16-bit audio as 4 bits (a 4:1 compression ratio).

ADPCM(Adaptive Differential Pulse Code Modulation)，是一种针对 16bits( 或8bits或者更高) 声音波形数据的一种有损压缩算法,它将声音流中每次采样的 16bit 数据以 4bit 存储,所以压缩比 1:4. 而且压缩/解压缩算法非常简单,所以是一种低空间消耗，高质量高效率声音获得的好途径。保存声音的数据文件后缀名为 .AUD 的大多用ADPCM 压缩-ADPCM (Adaptive Differential Pulse Code Mod

LFM pulse compression of the Matlab program, ECG data and includes source code written in MATLAB, The performance of the program has reached a high level.