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

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