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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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  • Online File Compressor - Reduce the file size of your files
    Compress your files online Please select one of the compression tools below: A powerful PDF compressor that reduces the file size of your PDF file Select the compression level you need for your PDF document compression
  • 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 In the latter, compression is measured against the system’s volume at the standard pressure to which an organism is
  • 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]
  • How File Compression Works - HowStuffWorks
    Compressing a file essentially involves using compression software to reduce its size This process can help you save disk space and make the file easier to send over the Internet Here’s a straightforward guide on how to compress files, specifically focusing on creating a zip file, a popular format for compressed folders
  • 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
    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
  • compression noun - Definition, pictures, pronunciation and usage notes . . .
    compression (of something) (into something) the act of reducing something and fitting it into a smaller space or amount of time the compression of both plays into a single three-hour drama
  • 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 The cycle of an internal combustion engine during which the fuel and air mixture is compressed The process by which data is compressed
  • COMPRESSION Definition Meaning - Dictionary. com
    The re-encoding of data (usually the binary data used by computers) into a form that uses fewer bits of information than the original data Compression is often used to speed the transmission of data such as text or visual images, or to minimize the memory resources needed to store such data





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