说明：  Huffman编码的讲义，讲述了标准huffman编码的原理，也讲了各种变体形式，包括多媒体编码中常用的规范huffman编码原理。
(Huffman coded notes about the standard huffman coding principle, but also talk about a variety of variant forms, including multimedia encoding used in the normative principles of huffman coding.)