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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 Definition Meaning - Merriam-Webster
    The meaning of COMPRESSION is the act, process, or result of compressing How to use compression in a sentence
  • 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
  • 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 Springs | McMaster-Carr
    Choose from our selection of compression springs, including over 9,800 products in a wide range of styles and sizes Same and Next Day Delivery
  • COMPRESSION | definition in the Cambridge English Dictionary
    COMPRESSION meaning: 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
    Define compression compression synonyms, compression pronunciation, compression translation, English dictionary definition of compression n 1 a The act or process of compressing b The state of being compressed 2 a The process by which the working substance in a heat engine, such as the
  • Compression: Meaning, Definition, Force, Ratio and Differences
    Compression is the process of making something smaller by pressing or squeezing it In technology, it means reducing the size of files, data, or signals so they use less space or can be sent faster Compression is used in many areas such as images, videos, audio, and text files
  • compression noun - Definition, pictures, pronunciation and usage notes . . .
    Definition of compression noun in Oxford Advanced Learner's Dictionary Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more
  • 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
  • High-Quality CPR - American Heart Association CPR First Aid
    High-quality CPR is the primary component in influencing survival from cardiac arrest To save more lives, healthcare providers must be competent in delivering high-quality CPR, and patient care teams must be coordinated and competent working together effectively High-quality CPR performance metrics include: Chest compression fraction >80% Compression rate of 100-120 min Compression depth of





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