Pfungwa date compression kuderedza inzwi rayo

Mazuva ano, vanhu vakawanda vanofunga zvakawanda sei mashoko compression kwacho kuti aponese zvakaoma dhisiki nzvimbo, ndiyo imwe unyatsoshandisa zvinokosha nzvimbo chero okuchengetera mano. Kazhinji, yepamusoro vanoshandisa vari nomubvunzo kushaya vakasununguka nzvimbo kwako nemotokari, zvakakodzera kubvisa chero mashoko achiedza kuzvisunungura kurudyi nzvimbo, apo zvakawanda yepamusoro vanoshandisa vanowanzoshandisa mashoko compression kuitira kuderedza inzwi rayo.

Zvisinei, vakawanda havazivi zita nedanho compression mashoko, tisingatauri chii algorithms zvinoshandiswa, uye kuti anopa kushanda neimwe.

Kana kuti tsonyera mashoko?

Data compression kunokosha zvokuti zuva, uye zvakakodzera kuti chero user. Chokwadi, mazuva ano zvinenge munhu anogona kutenga yepamusoro date kuchengetwa, ichipa mukana uchishandisa zvakakwana yakawanda vakasununguka nzvimbo, uye vakagadzirira pamwe mukuru-nokukurumidza Data nhepfenyuro makwara.

Zvisinei, chinofanira kuva zvakanaka kunzwisiswa uye kuti bhuku date kuti zvinofanira kuparadzirwa kunowedzerawo pamusoro nguva. Uye kana makore gumi chete apfuura, mutemo kwakajairika firimu kwainzi kuva bhuku 700MB, musi mafirimu, yakaitwa HD yakamboita, angava vhoriyamu akaenzana wandei makumi ezviuru gigabytes, tisingatauri sei zvikuru nzvimbo inogarwa yepamusoro mifananidzo muna Blu-ray format.

Kana date compression kunokosha?

Ichokwadi, mumwe ngaarege kutarisira kuti mashoko compression muitiro achauyisa imi makomborero akawanda, asi pane mumwe nhamba ezvinhu umo vamwe mashoko compression mitoo dzinokosha zvikuru, uye kunyange zvakafanira:

• Kuchinjwa zvimwe zvinyorwa kuburikidza e-mail. Izvi ndezvechokwadi kunyanya kune avo ezvinhu kana unofanira kubudisa mashoko pamwero, kushandisa dzakasiyana-siyana Mobile mano.
• Kazhinji date compression kwacho kuti kuderedza yaigarwa nzvimbo rinoshandiswa mune bhuku nedzimwe mashoko ari nzvimbo dzakasiyana-siyana kuti zvinoda kunze bandwidth;
• Kuchengetedza nzvimbo hard drive yako iri chiitiko kuti hazvibviri kuti kutsiva kana kuwedzera zvitsva okuchengetera zvivako. Kunyanya, inonyanya mamiriro ezvinhu ndiwo kana paine zvimwe zvausingakwanisi ari kuwanikwa bhajeti, asi haina zvakakwana yepachena dhisiki nzvimbo kuti.

Chokwadi, kuwedzera kune apa, pane zvakawanda mamiriro ezvinhu akasiyana kuti ingada kuti mashoko compression kwacho kuitira kuderedza inzwi rayo, asi izvi ndiwo inonyanya nhasi.

Ndingaita sei dzvinya mashoko?

Nhasi, kune nzira dzakasiyana-siyana kuti mashoko compression, asi vari mapoka mapoka maviri huru - compression iyi vamwe nezvinhu, uyewo lossless compression.

Kushandisa yokupedzisira boka nzira rinoshanda apo Data vanofanira kudzorerwa nounzenza yakakwirira nemazvo, kusvikira mumwe wedzeredzei. Izvi ndizvo chete kushanda panyaya kana compression rinoitwa kubva murugwaro gwaro.

Zvinokosha kucherechedza kuti mune mamwe mamiriro ezvinhu hapana chikonzero chiri yakarurama zvikuru rokuvakazve compressed Data saka anopa kushandisa algorithms dzakadaro, apo dhisiki Data compression rinoitwa nevamwe varasikirwa. Kunakisa lossy compression ndechokuti zvemichina uyu zvikuru nyore kushandisa, uye anotipa soro zvaibvira mwero archiving.

Lossy compression

Algorithms nokuti date compression vaaida anopa akarayira kuti unokosha nani compression apo kuramba yakakwana unhu ruzivo. Kazhinji, kushandisa algorithms dzakadaro rinoitwa kuti dzvinya analoginen data, akadai ose mifananidzo kana mitinhimira. Mumamiriro ezvinhu akadaro, anobviswa mafaira ingava rakasiyana ruzivo pakutanga, asi kune munhu ziso kana nzeve dzinenge indistinguishable.

Lossless

Compression algorithms ruzivo lossless kupa yakarurama zvikuru mashoko kupora, precluding chero kurasikirwa compressed mafaira. Zvisinei, zvinokosha kuti zvakarurama kunzwisisa chokwadi kuti iyi nyaya inopiwa hainyanyoshanda faira compression.

nzira Universal

Uyezve, pane dzimwe nhamba yezvisikwa nzira, iyo akaita chinobudirira date compression rikurumidze kuderedza nzvimbo inogarwa nayo. Kazhinji, unogona kusarudza zvose michina mikuru mitatu:

• Change rukova. Panyaya iyi, tsananguro itsva kuuya uncompressed mashoko kuburikidza kare kupatsanurwa mafaira, dzemaitirwe hauna kuitwa chero mukana, uye inofananidzira zviratidzo pachishandiswa chete mafaira avo kuti zvaiswa pasi dzimwe kurapa.
• Statistical compression. Izvi date compression muitiro kuderedza nayo kubatikana dhisiki nzvimbo iri kuparadzirwa munzvimbo mbiri Sub-Mapato - adaptive uye modular nzira. Adaptive Ipfungwa zvinopa kukarukureta pakati fungidziro kuti mafaira itsva mashoko ari kupatsanurwa mune yeEncoding kwacho. Zvikurukuru, nzira dzakadaro vanofanira zvinosanganisirawo dzakasiyana-siyana adaptive algorithms Shannon-there uye Huffman. Block algorithm rinopa yoga vyschityvanie neimwe ruzivo chikwata achiteverwa kuwedzera compressed misa.
• Unit kutendeuka. Kuuya ruzivo rakakamurwa dzakawanda zvinogumbura, uye zvadaro chinoitika chinokosha kushanduka. Muchiitiko chino, zvinofanira kucherechedzwa kuti vamwe nzira, kunyanya avo vari kwakavakirwa transposition vezvikwata akawanda, anogona anonamata chinokosha zvinoderedza bhuku compressed mashoko. Zvisinei, unofanira nzisisa kuti pashure kurapwa ichi, pakupedzisira pane chinokosha nani humboo mamiriro, naro maitiro unozotevera compression nevamwe algorithms chinozoiswa zvikuru nokukurumidza uye nyore.

Compression kana nokukopa

Chimwe chezvinhu zvinokosha zvinoumba ari negadziriro yeparutivi ndiwo mudziyo naro kufamba runodiwa mushandisi ruzivo. The zvakawanda date iwe dzichadzedzereka, zvikuru volume mudziyo unofanira kushandisa. Zvisinei, kana une date compression muitiro chichaitwa, ipapo dambudziko yokusava nzvimbo angangotadza kuramba akakodzera kwamuri.

Nei izvozvo?

Mukana date compression panguva backups anogona kuderedza nguva zvichava zvakakodzera kutevedzera zvakakodzera mafaira, uye panguva imwecheteyo kuzadzisa kunyatsoshanda mumari vakasununguka nzvimbo pamusoro tikachirega. Nemamwe mashoko, kana uchishandisa compression mashoko zvichabviswa zvakakopwa kuti zvikuru chiine nokutsanya, uye iwe unogona kuponesa mari yako uye mari, izvo zvaidiwa kutenga zvimwe okuchengetera vhoriyamu. Pakati pezvimwe zvinhu, kuita date compression, nemiwo akacheka nguva inodiwa kuti kutakurwa mashoko ose pamusoro Server, kana kuakopa pamusoro pemambure.

Data compression nokuti negadziriro yeparutivi kunogona kuitwa imwe kana kupfuura mafaira - iyi, zvose kuchaenderana worudzii chirongwa iwe kushandisa uye chii mashoko compressed.

Pakusarudza mudziyo, iva nechokwadi kuti kutarisa papi purogiramu dzvinya date wasarudza. It kunobva mhando mashoko, mauri compression kunyatsoshanda orugwaro magwaro anogona kuva anopfuura 90%, ukuwo mifananidzo compression tichabudirira kuti haana kupfuura 5%.