Eight-to-Fourteen Modulation (EFM)

  The data encoding scheme used in CDs in order to optimize the process of reading off the disk. Groups of eight data bits are regrouped into fourteen-bit blocks by EFM modulator during cutting of the CD master, permitting about 25% greater data density to be laser-inscribed on the disc and allowing easier error recognition. An EFM demodulator in the CD player decodes the data.

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