MP3 and AAC Explained
The last few years have shown widespread proliferation of .mp3 files from both legal and illegal sources. Yet most people using these audio files do not know much about audio compression and how to use it. The paper includes an introduction to audio compression for music file exchange. Beyond the basics, the focus is on quality issues and compression ratio/audio bandwidth/artifacts tradeoffs.
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This paper costs $33 for non-members and is temporarily free for AES members.