
Eight-to-fourteen modulation (EFM) is a data encoding technique – formally, a channel code – used by compact discs (CD), laserdiscs (LD) and pre-Hi-MD MiniDiscs. EFMPlus is a related code, used in DVDs and SACDs. EFM and EFMPlus were both invented by Kees A. Schouhamer Immink.{Fact|date=June 2009} == Technological classification == EFM belongs...
Found on
http://en.wikipedia.org/wiki/Eight-to-fourteen_modulation

channel encoding, used for example in the compact disc system, whereby each group of eight data bits is replaced by a fourteen bit block in order to optimize the data throughput of the channel
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=807-01-12
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