Zigzag

语音编码中的MELP的经典估计，用于matlab实现(MELP speech coding in the classical estimate for matlab to achieve)

说明：  用单片机来直接驱动步进电机很精确走小步子.(Using single-chip to directly drive stepper motor is very accurate take small steps.)

设电文字符集D及各字符出现的概率F如下： D={a，b，c，d，e，f，g，h}（字符数n=8） F={5，29，7，8，14，23，3，11}( ) 编写完成下列功能的程序： ①构造关于F的Huffman树； ②求出并打印D总各字符的Huffman编码。 程序结构： 类型说明； 构造Huffman树的函数：Huffman_tree(H[m+1])； 求Huffman编码的函数：Huffman_code(code[n+1])； main() { 变量说明； 输入字符集D及频率F； 调用Huffman_tree(H)； 调用Huffman_code(code)； 打印编码； Y 继续？ N 停止 }

利用霍夫曼编码算法对数字图像进行压缩及解压缩处理，解压出来的图像与源图像几乎完全一致，峰值信噪比为无穷大(The use of Huffman coding algorithm for digital image compression and decompression processing, extracting images from the source image is almost exactly the same infinite PSNR)

BWT压缩方法描述，是一种被bzip2等数据压缩技术所使用的算法(The Burrows–Wheeler transform (BWT, also called block-sorting compression), is an algorithm used in data compression techniques such as bzip2.)

说明：  JPEG-LS压缩和解压缩算法的C代。。。。(This is a commonly used JPEG-LS codec C language.)

哈夫曼编码(Huffman Coding)，又称霍夫曼编码，是一种编码方式，哈夫曼编码是可变字长编码(VLC)的一种。Huffman于1952年提出一种编码方法，该方法完全依据字符出现概率来构造异字头的平均长度最短的码字，有时称之为最佳编码，一般就叫做Huffman编码(有时也称为霍夫曼编码)。(Huffman encoding (Huffman Coding), also called Huffman Coding, is a way of Coding, Huffman Coding is variable word length Coding (VLC). Huffman in 1952 put forward a kind of coding method, this method is completely based on the characters of the occurrence probability to construct the average length of the shortest code word, sometimes called the best coding, generally is called Huffman coding (sometimes referred to as the Huffman coding).)

zigzag函数的matlab实现，通常图象压缩中经常需要用的ZIGZAG函数(the zigzag function realized by matlab)

基于verilog的LZS压缩和解压算法，压缩比1；2 。里面带有C原言的代码。已经通过验证！(Verilog based LZS compression and decompression algorithm, compression ratio 1; 2. It has the C code in it. It has been verified!)

利用gzip.dll解压http请求返回的内容。内附gzip.dll。参考网上资料自己写的VB6工程源码。自己编译EXE的时候注意把gzip.dll释放到exe所在目录。(Use gzip.dll to decompress the content returned by HTTP request. Gzip.dll is attached. Refer to the VB6 project source code written by myself.)