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CHAPTER 3

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.

Sharp as a Photograph?

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