p.862是ITU标准提案，主要是用来对窄带电话网的端到端语音质量和语音编码器解码的语音质量进行评估。中有p.862的标准文档和实现软件。-p.862 is ITU standard proposal, is mainly used to evaluate the narrowband telephone network and the end-to-end voice quality and voice quality of the decoded speech encoder. P.862

g7221是ITU的标准提案，主要应用了mlt变换技术，矢量量化技术和哈夫曼编码技术。中有g7221标准的中英文文档说明及实现的c源代码。-g7221 is the ITU standard proposal, the main application mlt transform vector quantization and Huffman coding techniques. In g7221 standards in English document describes the imple