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The article Audio codec needs to be expanded.

Improvements

 * Include a discussion of how audio codecs are designed around human hearing.
 * Provide a short list of popular audio codecs.
 * Mention the difference between lossy compression, lossless compression, and uncompressed codecs.
 * The article states that an audio codec compresses and decompresses audio data, but some codecs (notably PCM) do not perform compression of data.
 * Find citations for already-present information, or remove it.