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Eight-to-Fourteen Modulation
Last modified: Tuesday, June 14, 2005 

Eight-to-Fourteen Modulation, or EFM as it is abbreviated, is an encoding technique used by CDs and provides a way of countering errors by encoding a byte into 2 bytes. Using EFM the data is broken into 8-bit blocks (bytes). Each 8-bit block is translated into a corresponding 14-bit codeword using a predefined lookup table. The 14-bit codeword are chosen so that binary ones are always separated by a minimum of two and a maximum of ten binary zeroes. EFM maximizes the number of transitions possible with an arbitrary pit and land length which is determined by the wavelength of the laser light used to read the data. Eight-to-Fourteen Modulation uses an RLL encoding scheme.

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For internet.com pages about Eight-to-Fourteen Modulation . Also check out the following links!

Related Links

CCRMA Lecture
Coding and Modulation Schemes for Digital Audio.

EFM look-up
Eight-to-Fourteen Modulation Conversion Table.

related categories

CD-ROMs

Data Storage

related terms

byte

compact disc

data

MFM

RLL


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