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Что (кто) такое MFM encoding - определение
ENCODING IN COMMUNICATION TECHNOLOGY
Delay encoding; Miller code; Miller encoding; MMFM; Miller coding; Modified Modified Frequency Modulation; M2FM; M²FM; Miller sub-carrier coding; Miller subcarrier coding; Miller encoded subcarrier; Miller encoded sub-carrier; Miller sub-carrier code; Miller subcarrier code; Delay coding; MFM (encoding); FM (encoding); Digital FM; Delay code; Modified modified frequency modulation; MMFM (encoding); FM line code; Modified modified FM; Modified squared FM; Modified squared frequency modulation; Intel MMFM; Intel M²FM; Intel M2FM; ISBC MMFM; ISBC M²FM; ISBC M2FM; ISIS MMFM; ISIS M²FM; ISIS M2FM; Intel Modified Modified Frequency Modulation; Intel Modified modified frequency modulation; Miller Code; Modified Frequency Modulation; MFM encoding; Data separator
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Encoding (memory)
MEMORY PROCESS
Encoding (Memory); Memory encoding; Computational models of memory encoding
Memory has the ability to encode, store and recall information. Memories give an organism the capability to learn and adapt from previous experiences as well as build relationships.
Modified Frequency Modulation
<storage> (MFM, Modified FM, or sometimes "Multiple
Frequency Modulation") A modification to the original
frequency modulation scheme for encoding data on {magnetic
disks}. MFM allows more than 1 symbol per flux transition (up
to 3), giving greater density of data. It is used with a data
rate of between 250-500 kbit/s on industry standard 3.5" and
5.25" low and high density diskettes, and up to 5 Mbit/s on
ST-506 hard disks. Except for 1.44 MB floppy disks, this
encoding is obsolete.
Other data encoding schemes include GCR, FM, RLL. See
also: PRML.
(2002-06-24)
Modified frequency modulation
Modified frequency modulation (MFM) is a run-length limited (RLL) line code used to encode data on most floppy disks and some hard disk drives. It was first introduced on hard disks in 1970 with the IBM 3330 and then in floppy disk drives beginning with the IBM 53FD in 1976.
MFM
WIKIMEDIA DISAMBIGUATION PAGE
MFM (disambiguation)
Modified Frequency Modulation
character encoding scheme
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SYSTEM USING A PRESCRIBED SET OF DIGITAL VALUES TO REPRESENT TEXTUAL CHARACTERS
Character set; Text encoding; International character set; Character code; Charset; Text encodings; Character encodings; Character sets; Legacy encoding; Character Set; Codeset; Legacy character set; Coded character set; Charsets; Coded Character Set; Character repertoire; Character encoding scheme; Character encoding form; Code character; Coded character; Code unit; Symbol set; Draft:List of computer character encodings; Character encoding system; Character coding system; Character coding; IBM Character Data Representation Architecture; Character Data Representation Architecture; IBM CDRA; CDRA; File encoding; File encodings; Convmv; Code set; Unicode encoding model; Character encoding translation; History of character encoding
character repertoire
SYSTEM USING A PRESCRIBED SET OF DIGITAL VALUES TO REPRESENT TEXTUAL CHARACTERS
Character set; Text encoding; International character set; Character code; Charset; Text encodings; Character encodings; Character sets; Legacy encoding; Character Set; Codeset; Legacy character set; Coded character set; Charsets; Coded Character Set; Character repertoire; Character encoding scheme; Character encoding form; Code character; Coded character; Code unit; Symbol set; Draft:List of computer character encodings; Character encoding system; Character coding system; Character coding; IBM Character Data Representation Architecture; Character Data Representation Architecture; IBM CDRA; CDRA; File encoding; File encodings; Convmv; Code set; Unicode encoding model; Character encoding translation; History of character encoding
<character> The set of all characters onto which a {coded
character set} maps integers (code positions).
For example, consider these two simple coded character sets:
Coded Character Set One:
integer 0 -> the character "A"
integer 1 -> the character "B"
Coded Character Set Two:
integer 0 -> the character "B"
integer 1 -> the character "A"
Both of these coded character sets map to the characters "A"
and "B", so they have the same character repertoire. But
since the mapping is different (and obviously incompatible),
these are different coded character sets.
(1998-12-17)
character encoding
SYSTEM USING A PRESCRIBED SET OF DIGITAL VALUES TO REPRESENT TEXTUAL CHARACTERS
Character set; Text encoding; International character set; Character code; Charset; Text encodings; Character encodings; Character sets; Legacy encoding; Character Set; Codeset; Legacy character set; Coded character set; Charsets; Coded Character Set; Character repertoire; Character encoding scheme; Character encoding form; Code character; Coded character; Code unit; Symbol set; Draft:List of computer character encodings; Character encoding system; Character coding system; Character coding; IBM Character Data Representation Architecture; Character Data Representation Architecture; IBM CDRA; CDRA; File encoding; File encodings; Convmv; Code set; Unicode encoding model; Character encoding translation; History of character encoding
<character> (Or "character encoding scheme") A mapping of
binary values to code positions and back; generally a 1:1
(bijective) mapping.
In the case of ASCII, this is generally a f(x)=x mapping:
code point 65 maps to the byte value 65, and vice versa. This
is possible because ASCII uses only code positions
representable as single bytes, i.e., values between 0 and 255,
at most. (US-ASCII only uses values 0 to 127, in fact.)
Unicode and many CJK coded character sets use many more
than 255 positions, requiring more complex mappings: sometimes
the characters are mapped onto pairs of bytes (see DBCS).
In many cases, this breaks programs that assume a one-to-one
mapping of bytes to characters, and so, for example, treat any
occurrance of the byte value 13 as a carriage return. To
avoid this problem, character encodings such as UTF-8 were
devised.
(1998-10-18)
character set
SYSTEM USING A PRESCRIBED SET OF DIGITAL VALUES TO REPRESENT TEXTUAL CHARACTERS
Character set; Text encoding; International character set; Character code; Charset; Text encodings; Character encodings; Character sets; Legacy encoding; Character Set; Codeset; Legacy character set; Coded character set; Charsets; Coded Character Set; Character repertoire; Character encoding scheme; Character encoding form; Code character; Coded character; Code unit; Symbol set; Draft:List of computer character encodings; Character encoding system; Character coding system; Character coding; IBM Character Data Representation Architecture; Character Data Representation Architecture; IBM CDRA; CDRA; File encoding; File encodings; Convmv; Code set; Unicode encoding model; Character encoding translation; History of character encoding
<character> 1. A particular mapping between characters and
byte strings, i.e. the combination of a particular
character encoding (which maps between byte strings and
integers) and a particular coded character set (which maps
between integers and characters).
For example: ASCII (the ASCII coded character set, encoded
directly as single-byte values), or UTF-8 (the Unicode coded
character set, encoded with an 8-bit transformation method).
2. Occasionally: a character repertoire; or a {coded
character set}.
(1998-12-17)
coded character set
SYSTEM USING A PRESCRIBED SET OF DIGITAL VALUES TO REPRESENT TEXTUAL CHARACTERS
Character set; Text encoding; International character set; Character code; Charset; Text encodings; Character encodings; Character sets; Legacy encoding; Character Set; Codeset; Legacy character set; Coded character set; Charsets; Coded Character Set; Character repertoire; Character encoding scheme; Character encoding form; Code character; Coded character; Code unit; Symbol set; Draft:List of computer character encodings; Character encoding system; Character coding system; Character coding; IBM Character Data Representation Architecture; Character Data Representation Architecture; IBM CDRA; CDRA; File encoding; File encodings; Convmv; Code set; Unicode encoding model; Character encoding translation; History of character encoding
<character, standard> A mapping from a set of integers to a
set of characters. This mapping is generally 1:1 (i.e.,
bijective), for example, the code position 65 in ASCII
maps only to "A", and it's the only position that maps to "A".
There are several standard coded character sets, the most
widely used is ASCII, generally in its Latin-1 dialect,
with Unicode becoming slowly more common; while EBCDIC and
Baudot are extinct except in legacy systems.
A coded character set may include letters, digits,
punctuation, control codes, various mathematical and
typographic symbols, and other characters. Each character in
the set is represented by a unique character code (or "{code
position}").
(1998-10-18)
Википедия
Modified frequency modulation
Modified frequency modulation (MFM) is a run-length limited (RLL) line code used to encode data on most floppy disks and some hard disk drives. It was first introduced on hard disks in 1970 with the IBM 3330 and then in floppy disk drives beginning with the IBM 53FD in 1976.
MFM is a modification to the original frequency modulation encoding (FM) code specifically for use with magnetic storage. MFM allowed devices to double the speed data was written to the media as the code guaranteed only one polarity change per encoded data bit. For this reason, MFM disks are typically known as "double density" while the earlier FM became known as "single density".
MFM is used with a data rate of 250–500 kbit/s (500–1000 kbit/s encoded) on industry-standard 5+1⁄4-inch and 3+1⁄2-inch ordinary and high-density floppy diskettes. MFM was also used in early hard disk designs, before the advent of more efficient types of RLL codes. Outside of niche applications, MFM encoding is obsolete in magnetic recording.
