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Video compression systems: audio codec Audio codec The 'audio codec' block contains all modules which are used for audio compression/decompression. Examples of these modules are: MPEG-1, layer 1 MPEG-1, layer 2 MPEG-1, layer 3 (also know as MPEG-3 or MP3) MPEG-2 audio additions (like 5.1 digital audio) G.711 G.722 G.728 etc.