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RealAudio
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==Codecs== RealAudio files are compressed using several [[audio codec]]s. Each codec is identified by a [[FourCC|four character code]]. Below is a list of the codecs and the version in which each was introduced: * {{mono|lpcJ}}, {{mono|14_4}}: [[IS-54]] [[VSELP]] (RealAudio 1) * {{mono|28_8}}: [[G.728]] [[LD-CELP]] (RealAudio 2) * {{mono|dnet}}: [[Dolby Laboratories|Dolby]] [[Dolby AC-3|AC3]] (RealAudio 3) * {{mono|sipr}}: Sipro Lab Telecom [[ACELP|ACELP-NET]] (RealAudio 4/5) * {{mono|cook}}: G2/[[Cook Codec]] (RealAudio 6) * {{mono|atrc}}: [[Sony Corporation|Sony]] [[ATRAC|ATRAC3]] (RealAudio 8) * {{mono|raac}}: [[MPEG-4]] [[Advanced Audio Coding|LC-AAC]] (RealAudio 9) * {{mono|racp}}: [[MPEG-4]] [[HE-AAC]] (RealAudio 10) * {{mono|ralf}}: [[RealAudio Lossless]] Format (RealAudio 10) While the newest version of RealPlayer should be able to play any RealAudio file, other programs may not support all codecs.
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