{"id":29999,"date":"2019-10-31T21:33:07","date_gmt":"2019-10-31T18:33:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kompakt-disku-40-let-i-on-myortv-li\/"},"modified":"2019-10-31T21:33:07","modified_gmt":"2019-10-31T18:33:07","slug":"kompakt-disku-40-let-i-on-myortv-li","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/kompakt-disku-40-let-i-on-myortv-li","title":{"rendered":"CD m\u00e1 40 let a je mrtv\u00e9 (nebo?).","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"CD
\nPrototyp p\u0159ehr\u00e1va\u010de Philips, \u010dasopis Elektuur \u010d. 188, \u010derven 1979, Public domain mark 1.0<\/a><\/noindex><\/i><\/p>\n

Kompaktn\u00ed disku je 40 let a pro ty z n\u00e1s, kdo si pamatuj\u00ed, jak to v\u0161echno za\u010dalo, z\u016fst\u00e1v\u00e1 dodnes z\u00e1hadn\u00fdm technologick\u00fdm \u00fasp\u011bchem, i v dob\u011b, kdy byl tento nosi\u010d tla\u010den do pozad\u00ed streamingov\u00fdmi slu\u017ebami.<\/p>\n

Pokud se sna\u017e\u00edte ur\u010dit moment, kdy digit\u00e1ln\u00ed technologie za\u010daly vytla\u010dovat analogov\u00e9 v spot\u0159ebn\u00ed elektronice, pak lze vznik CD pova\u017eovat za takov\u00fd okam\u017eik. V polovin\u011b sedmdes\u00e1t\u00fdch let byly nej\u017e\u00e1dan\u011bj\u0161\u00edmi elektronick\u00fdmi \u201ehra\u010dkami\u201c analogov\u00fd videorekord\u00e9r a CB r\u00e1dio, ale s uveden\u00edm prvn\u00edch dom\u00e1c\u00edch po\u010d\u00edta\u010d\u016f a laserov\u00fdch p\u0159ehr\u00e1va\u010d\u016f se sny tou\u017e\u00edc\u00edch b\u00fdt \u201ena vrcholu vlny\u201c n\u00e1hle zm\u011bnily. CD p\u0159ehr\u00e1va\u010d se uk\u00e1zal jako prvn\u00ed dom\u00e1c\u00ed elektronick\u00fd p\u0159\u00edstroj, kter\u00fd obsahoval sice mal\u00fd, ale skute\u010dn\u00fd laser, co\u017e se tehdy zd\u00e1lo jako n\u011bco fantastick\u00e9ho, t\u00e9m\u011b\u0159 nerealistick\u00e9ho. Dnes nov\u00e9 technologie, kdy\u017e vstupuj\u00ed na trh, nevytv\u00e1\u0159ej\u00ed takov\u00fd efekt: jsou vn\u00edm\u00e1ny jako n\u011bco, co se objevuje a miz\u00ed \u201esv\u00fdm vlastn\u00edm tempem\u201c.<\/a><\/noindex><\/p>\n

Odkud p\u0159i\u0161el?<\/h1>\n

\n\u201eNohy\u201c form\u00e1tu rostou z nejnov\u011bj\u0161\u00edch metod videonahr\u00e1v\u00e1n\u00ed t\u00e9 doby, kter\u00e9 se v\u00fdvoj\u00e1\u0159i sna\u017eili p\u0159izp\u016fsobit i pro kvalitn\u00ed nahr\u00e1v\u00e1n\u00ed zvuku. V spole\u010dnosti Sony se sna\u017eili p\u0159izp\u016fsobit videomagnetofon pro digit\u00e1ln\u00ed nahr\u00e1v\u00e1n\u00ed zvuku, zat\u00edmco Philips cht\u011bl nahr\u00e1vat zvuk v analogu na optick\u00e9 disky, podobn\u00e9 t\u011bm, kter\u00e9 u\u017e byly pou\u017eity pro ukl\u00e1d\u00e1n\u00ed videa. Pot\u00e9 in\u017een\u00fd\u0159i obou korporac\u00ed dosp\u011bli k n\u00e1zoru, \u017ee je lep\u0161\u00ed nahr\u00e1vat na optick\u00fd disk, ale v digit\u00e1ln\u00ed podob\u011b. Dnes se to \u201eale\u201c zd\u00e1 b\u00fdt samoz\u0159ejm\u00e9, ale tehdy k tomu dosp\u011bli ne hned. Po v\u00fdvoji dvou nekompatibiln\u00edch, ale velmi podobn\u00fdch form\u00e1t\u016f za\u010daly spole\u010dnosti Sony a Philips spolupracovat, a do roku 1979 p\u0159edstavily prototypy p\u0159ehr\u00e1va\u010de a 120mm disku, kter\u00fd dok\u00e1zal pojmout v\u00edce ne\u017e hodinu 16bitov\u00e9ho stereozvuku s vzorkovac\u00ed frekvenc\u00ed 44,1 kHz. V popul\u00e1rn\u011b-nau\u010dn\u00e9 literatu\u0159e a periodik\u00e1ch byla nov\u00e9 technice p\u0159isuzov\u00e1na neuv\u011b\u0159iteln\u00e1 futuristi\u010dnost, p\u0159i\u010dem\u017e se p\u0159eh\u00e1n\u011bly jej\u00ed mo\u017enosti. V televizn\u00edch po\u0159adech slibovali, \u017ee tyto disky budou \u201enezni\u010diteln\u00e9\u201c v porovn\u00e1n\u00ed s vinylov\u00fdmi deskami, co\u017e je\u0161t\u011b v\u00edce podn\u011bcovalo z\u00e1jem o n\u011b. Leskl\u00fd st\u0159\u00edbrn\u00fd p\u0159ehr\u00e1va\u010d Philips s horn\u00edm nahr\u00e1v\u00e1n\u00edm vypadal \u00fa\u017easn\u011b, ale prvn\u00ed modely t\u011bchto za\u0159\u00edzen\u00ed se dostaly na police obchod\u016f a\u017e v roce 1982.<\/p>\n

Jak to funguje?<\/h1>\n

\nI kdy\u017e se u\u017eivatel\u016fm zd\u00e1la z\u00e1sada fungov\u00e1n\u00ed CD p\u0159ehr\u00e1va\u010de p\u0159\u00edli\u0161 slo\u017eit\u00e1 a nepochopiteln\u00e1, ve skute\u010dnosti je to p\u0159ekvapiv\u011b jednoduch\u00e9 a jasn\u00e9. Zvl\u00e1\u0161\u0165 ve srovn\u00e1n\u00ed s analogov\u00fdmi videomagnetofony, vedle kter\u00fdch st\u00e1lo mnoho z t\u011bchto p\u0159ehr\u00e1va\u010d\u016f. Na konci osmdes\u00e1t\u00fdch let na p\u0159\u00edkladu za\u0159\u00edzen\u00ed PC-D dokonce vysv\u011btlovali nejr\u016fzn\u011bj\u0161\u00ed t\u00e9mata budouc\u00edm in\u017een\u00fdr\u016fm elektroniky. Tehdy u\u017e mnoz\u00ed v\u011bd\u011bli, co to je za form\u00e1t, ale ne v\u0161ichni si mohli dovolit takov\u00fd p\u0159ehr\u00e1va\u010d koupit.<\/p>\n

\u010ctec\u00ed hlava CD mechaniky obsahuje p\u0159ekvapiv\u011b m\u00e1lo pohybliv\u00fdch \u010d\u00e1st\u00ed. Modul, kter\u00fd zahrnuje jak zdroj, tak p\u0159ij\u00edma\u010d z\u00e1\u0159en\u00ed, se pohybuje mal\u00fdm elektromotorem p\u0159es \u0161roubovici. IR laser osv\u011btluje prismu, kter\u00e1 odr\u00e1\u017e\u00ed paprsek pod \u00fahlem 90\u00b0. Objektiv ho zaost\u0159uje a pot\u00e9, co je odra\u017een od disku, se skrze stejn\u00fd objektiv vrac\u00ed zp\u011bt do prizmatu, ale tentokr\u00e1t nem\u011bn\u00ed sv\u016fj sm\u011br a dosahuje pole \u010dty\u0159 fotodiod. Mechanismus zaost\u0159ov\u00e1n\u00ed se skl\u00e1d\u00e1 z magnetu a c\u00edvek. P\u0159i spr\u00e1vn\u00e9m sledov\u00e1n\u00ed a zaost\u0159en\u00ed dosahuje nejvy\u0161\u0161\u00ed intenzity z\u00e1\u0159en\u00ed uprost\u0159ed pole, poru\u0161en\u00ed sledov\u00e1n\u00ed zp\u016fsobuje posun skvrny, zat\u00edmco poru\u0161en\u00ed zaost\u0159en\u00ed ji roz\u0161i\u0159uje. Automatika reguluje polohu \u010dtec\u00ed hlavy, zaost\u0159en\u00ed a po\u010det ot\u00e1\u010dek, aby na v\u00fdstupu vznikl analogov\u00fd sign\u00e1l, ze kter\u00e9ho lze extrahovat digit\u00e1ln\u00ed data p\u0159ich\u00e1zej\u00edc\u00ed po\u017eadovanou rychlost\u00ed.<\/p>\n

\"CD
\nZa\u0159\u00edzen\u00ed \u010dtec\u00ed hlavy s vysv\u011btlen\u00edm, CC BY-SA 3.0<\/a><\/noindex><\/i><\/p>\n

Bity se spojuj\u00ed do r\u00e1mc\u016f, na kter\u00e9 byla ji\u017e p\u0159i z\u00e1pisu aplikov\u00e1na modulace EFM (eight-to-fourteen modulation)<\/a><\/noindex>, kter\u00e1 umo\u017e\u0148uje vyh\u00fdbat se jednotliv\u00fdm nul\u00e1m a jedni\u010dk\u00e1m, nap\u0159\u00edklad sekvence 000100010010000100 se p\u0159ev\u00e1d\u00ed na 111000011100000111. Po pr\u016fchodu r\u00e1mc\u016f skrze vyhled\u00e1vac\u00ed tabulku vznik\u00e1 tok 16bitov\u00fdch dat, kter\u00fd proch\u00e1z\u00ed Reed-Solomonovu korekc\u00ed a p\u0159ich\u00e1z\u00ed na D\/A p\u0159evodn\u00edk. P\u0159esto\u017ee r\u016fzn\u00ed v\u00fdrobci b\u011bhem let existence form\u00e1tu zav\u00e1d\u011bli do tohoto syst\u00e9mu r\u016fzn\u00e1 vylep\u0161en\u00ed, hlavn\u00ed \u010d\u00e1st za\u0159\u00edzen\u00ed z\u016fst\u00e1vala pom\u011brn\u011b jednoduch\u00fdm opticko-elektronick\u00fdm uzlem.<\/p>\n

Co se s n\u00edm stalo potom?<\/h1>\n

\nV devades\u00e1t\u00fdch letech se form\u00e1t z fantastick\u00e9ho a presti\u017en\u00edho stal masov\u00fdm. P\u0159ehr\u00e1va\u010de v\u00fdrazn\u011b zlevnily, na trh p\u0159i\u0161ly p\u0159enosn\u00e9 modely. Diskov\u00e9 p\u0159ehr\u00e1va\u010de za\u010daly vytla\u010dovat kazetov\u00e9 z kapes. Tot\u00e9\u017e se d\u011blo i s CD-ROM, a ve druh\u00e9 polovin\u011b devades\u00e1t\u00fdch let bylo t\u011b\u017ek\u00e9 si p\u0159edstavit nov\u00fd PC bez CD mechaniky a multimedi\u00e1ln\u00ed encyklopedie v balen\u00ed. Nebyl v\u00fdjimkou ani Vist 1000HM \u2014 stylov\u00fd po\u010d\u00edta\u010d se sloupci integrovan\u00fdmi do monitoru, FM p\u0159\u00edjmac\u00edm a kompaktn\u00ed IR kl\u00e1vesnic\u00ed se zabudovan\u00fdm joystickem, p\u0159ipom\u00ednaj\u00edc\u00ed obrovsk\u00fd ovlada\u010d od hudebn\u00edho centra. Celkov\u011b k\u0159i\u010del sv\u00fdm vzhledem, \u017ee jeho m\u00edsto nen\u00ed v kancel\u00e1\u0159i, ale v ob\u00fdvac\u00edm pokoji, a m\u00e1 ambice obsadit m\u00edsto, kter\u00e9 zauj\u00edm\u00e1 pr\u00e1v\u011b hudebn\u00ed centrum. K n\u011bmu p\u0159ich\u00e1zel disk skupiny \u201eNautilus Pompilius\u201c s kompozicemi ve \u010dty\u0159bitov\u00fdch monofonn\u00edch WAV souborech, kter\u00e9 zab\u00edraly m\u00e1lo m\u00edsta. Existovaly tak\u00e9 specializovan\u00e9 za\u0159\u00edzen\u00ed vyu\u017e\u00edvaj\u00edc\u00ed jako nosi\u010d dat CD, nap\u0159\u00edklad Philips CD-i a Commodore Amiga CDTV, a tak\u00e9 p\u0159ehr\u00e1va\u010de Video CD, za\u0159\u00edzen\u00ed Sega Mega CD pro konzole Mega Drive\/Genesis, konzole 3DO a Play Station (prvn\u00ed)\u2026<\/p>\n

\"CD
\nCommodore Amiga CDTV, CC BY-SA 3.0<\/a><\/noindex><\/i><\/p>\n

\"CD
\nPo\u010d\u00edta\u010d Vist Black Jack II, kter\u00fd se od Vist 1000HM na pohled neli\u0161\u00ed, itWeek, (163)39`1998<\/a><\/noindex><\/i><\/p>\n

A zat\u00edmco bohat\u00ed tento trend osvojovali, na po\u0159adu dne byla nov\u00e1 t\u00e9mata: mo\u017enost nahr\u00e1vat CD doma. Op\u011bt to m\u011bl n\u00e1dech fantazie. Jen m\u00e1lokte\u0159\u00ed \u0161\u0165astn\u00ed majitel\u00e9 z\u00e1pisov\u00fdch mechanik se sna\u017eili sv\u00e9 n\u00e1klady na n\u011b vyv\u00e1\u017eit t\u00edm, \u017ee vyv\u011b\u0161ovali inzer\u00e1ty: \"Ud\u011bl\u00e1m z\u00e1lohu va\u0161eho pevn\u00e9ho disku na CD, levn\u011b.\" To v\u0161e nastalo ve stejnou dobu, kdy se objevil komprimovan\u00fd audioform\u00e1t MP3 a byly uvedeny na trh prvn\u00ed p\u0159ehr\u00e1va\u010de MPMan a Diamond Rio. Ty ale tehdy pou\u017e\u00edvaly st\u00e1le je\u0161t\u011b drahou flash pam\u011b\u0165, zat\u00edmco CD p\u0159ehr\u00e1va\u010d Lenoxx MP-786 se stal skute\u010dn\u00fdm hitem \u2014 skv\u011ble p\u0159ehr\u00e1val jak vlastn\u00ed, tak hotov\u00e9 disky s MP3 soubory. Napster a podobn\u00e9 platformy brzy padly za ob\u011b\u0165 nahr\u00e1vac\u00edm spole\u010dnostem, kter\u00e9 se v\u0161ak z\u00e1rove\u0148 za\u010daly zaj\u00edmat o nov\u00fd form\u00e1t. Jedn\u00edm z prvn\u00edch licencovan\u00fdch MP3 disk\u016f, kter\u00fd vydala skupina \u201eKrematorium\u201c, se stal tento p\u0159ehr\u00e1va\u010d. A p\u0159esto se jednomu p\u0159ekladateli jednou poda\u0159ilo dostat se do jednoho z t\u011bchto p\u0159ehr\u00e1va\u010d\u016f a odstranit z\u00e1vadu, kter\u00e1 zp\u016fsobovala, \u017ee se disk dot\u00fdkal v\u00edka. Uveden\u00ed prvn\u00edch iPod\u016f firmou Apple, kter\u00e9 umo\u017enily nakupovat alba prost\u0159ednictv\u00edm pohodln\u00e9ho rozhran\u00ed na obrazovce po\u010d\u00edta\u010de, povzbudilo hudebn\u00ed vydavatelstv\u00ed, aby kone\u010dn\u011b p\u0159e\u0161la z boje se zkomprimovan\u00fdmi audioform\u00e1ty na vyd\u011bl\u00e1v\u00e1n\u00ed pen\u011bz z nich. N\u00e1sledn\u011b smartphone t\u00e9m\u011b\u0159 vy\u0159adil samostatn\u00e9 MP3 p\u0159ehr\u00e1va\u010de je\u0161t\u011b rychleji, ne\u017e ty d\u0159\u00edve vytla\u010dily CD, a vinilov\u00e9 desky a kazety se nyn\u00ed znovu probouzej\u00ed k \u017eivotu. Je kompaktn\u00ed disk mrtv\u00fd? Asi ne, proto\u017ee v\u00fdroba jak mechanik, tak nosi\u010d\u016f nebyla zcela ukon\u010dena. A nen\u00ed vylou\u010deno, \u017ee nov\u00e1 vlna nostalgie znovu o\u017e\u00edvaj\u00edc\u00ed tento form\u00e1t.
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u043f\u0440\u043e\u0438\u0433\u0440\u044b\u0432\u0430\u0442\u0435\u043b\u044f Philips, \u0436\u0443\u0440\u043d\u0430\u043b Elektuur \u2116188, \u0438\u044e\u043d\u044c 1979, Public domain mark 1.0 \u041a\u043e\u043c\u043f\u0430\u043a\u0442-\u0434\u0438\u0441\u043a\u0443 40 \u043b\u0435\u0442, \u0438 \u0434\u043b\u044f \u0442\u0435\u0445 \u0438\u0437 \u043d\u0430\u0441, \u043a\u0442\u043e \u043f\u043e\u043c\u043d\u0438\u0442, \u043a\u0430\u043a \u043e\u043d \u043d\u0430\u0447\u0438\u043d\u0430\u043b\u0441\u044f, \u043e\u043d \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u0437\u0430\u0433\u0430\u0434\u043e\u0447\u043d\u044b\u043c \u0434\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u0435\u043c \u0432\u044b\u0441\u043e\u043a\u0438\u0445 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439 \u0434\u0430\u0436\u0435 \u0441\u0435\u0439\u0447\u0430\u0441, \u043a\u043e\u0433\u0434\u0430 \u044d\u0442\u043e\u043c\u0443 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