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DBpedia 2014

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Run-length_limited abstract "Run length limited or RLL coding is a line coding technique that is used to send arbitrary data over a communications channel with bandwidth limits. RLL codes are defined by four main parameters: m, n, d, k. The first two m/n refer to the rate of the code, while the remaining two specify the minimum d and maximum k number of zeroes between consecutive ones. This is used in both telecommunication and storage systems which move a medium past a fixed recording head. Specifically, RLL bounds the length of stretches (runs) of repeated bits during which the signal does not change. If the runs are too long, clock recovery is difficult — if they are too short, the high frequencies might be attenuated by the communications channel. By modulating the data, RLL reduces the timing uncertainty in decoding the stored data, which would lead to the possible erroneous insertion or removal of bits when reading the data back. Run-length limited codes were widely used in hard disk drives until the mid-1980s, and are still used in digital optical discs such as CD, DVD, MD, Hi-MD and Blu-ray. This mechanism ensures that the boundaries between bits can always be accurately found (preventing bit slip), while efficiently using the media to reliably store the maximum amount of data in a given space. Early disk drives used very simple encoding schemes, such as RLL (0,1) FM code, but higher density RLL (2,7) and RLL (1,7) codes became the de facto industry standard for hard disks by the early 1990s.".
Run-length_limited wikiPageExternalLink tapeint.htm.
Run-length_limited wikiPageID "449077".
Run-length_limited wikiPageRevisionID "575582151".
Run-length_limited hasPhotoCollection Run-length_limited.
Run-length_limited subject Category:Audio_storage.
Run-length_limited subject Category:Line_codes.
Run-length_limited subject Category:Physical_layer_protocols.
Run-length_limited subject Category:Rotating_disc_computer_storage_media.
Run-length_limited subject Category:Video_storage.
Run-length_limited type Abstraction100002137.
Run-length_limited type Code106667317.
Run-length_limited type Communication100033020.
Run-length_limited type Direction106786629.
Run-length_limited type LineCodes.
Run-length_limited type Message106598915.
Run-length_limited type PhysicalLayerProtocols.
Run-length_limited type Protocol106665108.
Run-length_limited type Rule106652242.
Run-length_limited type WrittenCommunication106349220.
Run-length_limited comment "Run length limited or RLL coding is a line coding technique that is used to send arbitrary data over a communications channel with bandwidth limits. RLL codes are defined by four main parameters: m, n, d, k. The first two m/n refer to the rate of the code, while the remaining two specify the minimum d and maximum k number of zeroes between consecutive ones. This is used in both telecommunication and storage systems which move a medium past a fixed recording head.".
Run-length_limited label "Run Length Limited encoding".
Run-length_limited label "Run Length Limited".
Run-length_limited label "Run Length Limited".
Run-length_limited label "Run-length limited".
Run-length_limited sameAs Run_length_limited.
Run-length_limited sameAs Run_Length_Limited.
Run-length_limited sameAs Run_Length_Limited_encoding.
Run-length_limited sameAs Run_Length_Limited.
Run-length_limited sameAs m.029s4v.
Run-length_limited sameAs Q281884.
Run-length_limited sameAs Q281884.
Run-length_limited sameAs Run-length_limited.
Run-length_limited wasDerivedFrom Run-length_limited?oldid=575582151.
Run-length_limited isPrimaryTopicOf Run-length_limited.