Lost and Found

The Story of Lossy Coding

iTunes files are encoded in AAC format, which, like mp3, is an example of a lossy coded format. Lossy coding was originally developed to produce smaller-size files and decrease download time for an impatient consumer. Lossy coding is a complicated process: in order to make a smaller file size, a Codec (coder-decoder) discards some of the source data based on frequency masking, level masking, and other criteria. Some information is lost compared to the standard PCM we’ve been discussing up to now.

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