MP3 文件是由帧(frame)构成的，帧是MP3 文件最小的组成单位。MP3 的全称应为MPEG1 Layer-3 音频

文件，MPEG(Moving Picture Experts Group)在汉语中译为活动图像专家组，特指活动影音压缩标准，MPEG

音频文件是MPEG1 标准中的声音部分，也叫MPEG 音频层，它根据压缩质量和编码复杂程度划分为三层，即

Layer-1、Layer2、Layer3，且分别对应MP1、MP2、MP3 这三种声音文件-MP3 files are by-frame (frame) make-up, the frame is the smallest unit of MP3 files. MP3 full name should be MPEG1 Layer-3 audio files, MPEG (Moving Picture Experts Group) in Chinese translated into Moving Picture Experts Group, refers specifically to the activities of audio and video compression standard, MPEG audio files is the voice part of the MPEG1 standard, also known as MPEG audio layer, It is based on the quality and coding complexity compression is divided into three layers, namely, Layer-1, Layer2, Layer3, and the corresponding MP1, MP2, MP3 audio files of these three