音频格式介绍，做流媒体的朋友可以参考。

ISO/IEC 13818包括系统，视频，音频，性能测试等11个部分，该文档属于第部分，主要介绍了AAC中的关键技术-ISO/IEC 138 consists of 11 parts, such as Systems, Video, Audio, Conformance testing, Software simulation, and so on. This document is the 7th part of 13818, it describes the key technologies

PCM编码、WMA编码、ADPCM编码、LPC编码、MP3编码、AAC编码、CELP编码等，包括优缺点对比和主要应用领域 音频编码很好的参考-PCM encoding, WMA encoding, ADPCM coding, LPC encoding, MP3 encoding, AAC coding, CELP coding, including the advantages and disadvantages of contrast and the main application fiel