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compression    音标拼音: [kəmpr'ɛʃən]
n. 压缩,压榨,缩小
n. 压缩

压缩,压榨,缩小压缩

compression
压缩


compression
压缩

compression
压缩

compression
n 1: an increase in the density of something [synonym: {compaction},
{compression}, {concretion}, {densification}]
2: the process or result of becoming smaller or pressed
together; "the contraction of a gas on cooling" [synonym:
{compression}, {condensation}, {contraction}]
3: encoding information while reducing the bandwidth or bits
required [ant: {decompression}]
4: applying pressure [synonym: {compression}, {compressing}] [ant:
{decompressing}, {decompression}]

Compression \Com*pres"sion\, n. [L. compressio: cf. F.
compression.]
1. The act of compressing, or state of being compressed.
"Compression of thought." --Johnson.
[1913 Webster]

2. (Computers) reduction of the space required for storage
(of binary data) by an algorithm which converts the data
to a smaller number of bits while preserving the
information content. The act of compressing [3].

Note: Compression may be {lossless compression}, in which all
of the information in the original data is preserved,
and the original data may be recovered in form
identical to its original form; or {lossy compression},
in which some of the information in the original data
is lost, and decompression results in a data form
slightly different from the original. {Lossy
compression} is used, for example, to compress audio or
video recordings, and sometimes images, where the
slight differences in the original data and the data
recovered after {lossy compression} may be
imperceptable to the human eye or ear. The {JPEG}
format is produced by a {lossy compression} algorithm.
[PJC]

74 Moby Thesaurus words for "compression":
abbreviation, abridgment, abstract, agglutination, apocope,
astriction, astringency, bottleneck, cervix, circumscription,
clamping, clamping down, clumping, clustering, coarctation,
compactedness, compaction, compressure, concentration, concretion,
condensation, consolidation, conspectus, constriction,
constringency, contraction, contracture, crush, curtailment,
decrease, densification, diminuendo, elision, ellipsis, epitome,
foreshortening, hardening, hourglass, hourglass figure, isthmus,
knitting, narrow place, narrowing, neck, nip, pinch, precis, press,
pressure, puckering, pursing, recap, recapitulation, reduction,
retrenchment, shortening, solidification, squeeze, squeezing,
stranglement, strangulation, striction, stricture, summary,
summation, syncope, synopsis, systole, telescoping, tightening,
truncation, tweak, wasp waist, wrinkling

1. (Or "compaction") The coding of data to save
storage space or transmission time. Although data is already
coded in digital form for computer processing, it can often be
coded more efficiently (using fewer bits). For example,
{run-length encoding} replaces strings of repeated characters
(or other units of data) with a single character and a count.
There are many compression {algorithms} and utilities.
Compressed data must be decompressed before it can be used.

The standard {Unix} compression utilty is called {compress}
though {GNU}'s superior {gzip} has largely replaced it. Other
compression utilties include {pack}, {zip} and {PKZIP}.

When compressing several similar files, it is usually better
to join the files together into an {archive} of some kind
(using {tar} for example) and then compress them, rather than
to join together individually compressed files. This is
because some common compression {algorithms} build up tables
based on the data from their current input which they have
already compressed. They then use this table to compress
subsequent data more efficiently.

See also {TIFF}, {JPEG}, {MPEG}, {Lempel-Ziv Welch},
"{lossy}", "{lossless}".

{Compression FAQ
(ftp://rtfm.mit.edu/pub/usenet/news.answers/compression-faq/)}.

{Web Content Compression FAQ
(http://perl.apache.org/docs/tutorials/client/compression/compression.html)}.

{Usenet} newsgroups: {news:comp.compression},
{news:comp.compression.research}.

2. Reducing the dynamic range of an audio signal,
making quiet sounds louder and loud sounds quieter. Thus,
when discussing digital audio, the preferred term for reducing
the total amount of data is "compaction". Some advocate this
term in all contexts.

(2004-04-26)


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  • Compression | Pressure, Force Volume | Britannica
    Compression, decrease in volume of any object or substance resulting from applied stress Compression may be undergone by solids, liquids, and gases and by living systems In the latter, compression is measured against the system’s volume at the standard pressure to which an organism is
  • COMPRESSION Definition Meaning - Merriam-Webster
    The meaning of COMPRESSION is the act, process, or result of compressing How to use compression in a sentence
  • Compression (physics) - Wikipedia
    In mechanics, compression is the application of balanced inward ("pushing") forces to different points on a material or structure, that is, forces with no net sum or torque directed so as to reduce its size in one or more directions [1]
  • COMPRESSION | English meaning - Cambridge Dictionary
    COMPRESSION definition: 1 the act of pressing something into a smaller space or putting pressure on it from different… Learn more
  • Compression - definition of compression by The Free Dictionary
    1 the act of compressing 2 the state of being compressed 3 the effect or result of being compressed 4 (in internal-combustion engines) the reduction in volume and increase of pressure of the air or combustible mixture in the cylinder prior to ignition 5 reduction of the size of computer data by efficient storage
  • What is compression in physics? - California Learning Resource Network
    Compression is the process of reducing the size or volume of an object, gas, or gas molecule by applying external pressure There are three main types of compression: mechanical, thermal, and electromagnetic
  • compression - Wiktionary, the free dictionary
    compression (countable and uncountable, plural compressions) An increase in density; the act of compressing, or the state of being compressed; compaction (automotive) The cycle of an internal combustion engine during which the fuel and air mixture is compressed
  • COMPRESSION definition in American English - Collins Online Dictionary
    Compression is the act or process of applying something with pressure Compression devices are designed to reduce swelling in the limbs by applying pressure If there is swelling in the ankle, a tight bandage can be used for compression
  • Compression (physics) - Force in Physics
    In physics and mechanics, compression refers to a physical force that exerts pressure on an object, leading it to be compressed or pressed inward, resulting in a reduction of its size or volume For instance, when force is applied to a gas-filled balloon, the gas molecules are compressed, causing the balloon to shrink
  • Compression Therapy: Types and Benefits - Cleveland Clinic
    Compression therapy helps increase blood circulation in the lower legs, ankles and feet It is an effective treatment for pain and swelling caused by conditions associated with poor circulation, such as chronic venous insufficiency and varicose veins





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