[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.ajsa.cz\/vyvoj-zaznamovych-medii\/#Article","mainEntityOfPage":"https:\/\/www.ajsa.cz\/vyvoj-zaznamovych-medii\/","headline":"V\u00fdvoj z\u00e1znamov\u00fdch m\u00e9di\u00ed","name":"V\u00fdvoj z\u00e1znamov\u00fdch m\u00e9di\u00ed","description":"Za\u010dalo to nejjednodu\u0161\u0161\u00edm zp\u016fsobem, kter\u00fd bylo mo\u017eno pou\u017e\u00edt. Mechanika a elektronika ve sv\u00fdch po\u010d\u00e1tc\u00edch \u0161la ruku v ruce. Tak vznikl gramofon a gramofonov\u00e9 desky. Ka\u017ed\u00fd v\u00ed, jak takov\u00e1 v\u011bc vypad\u00e1, \u010dern\u00e1 kulat\u00e1 placka s vroubky. Jak ale ve skute\u010dnosti funguje? Do vinylov\u00e9 desky jsou mechanicky vyryty ve spir\u00e1le dr\u00e1\u017eky, skrz kter\u00e9 je pak vedena jehla, […]","datePublished":"2023-05-07","dateModified":"2023-05-07","author":{"@type":"Person","@id":"https:\/\/www.ajsa.cz\/author\/#Person","name":"","url":"https:\/\/www.ajsa.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/4faace62981be50719be6a25151192978e6d585737a520836dcb98934de3bb45?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/4faace62981be50719be6a25151192978e6d585737a520836dcb98934de3bb45?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"ajsa.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.ajsa.cz\/wp-content\/uploads\/img_a344487_w2935_t1558349043.jpg","url":"https:\/\/www.ajsa.cz\/wp-content\/uploads\/img_a344487_w2935_t1558349043.jpg","height":0,"width":0},"url":"https:\/\/www.ajsa.cz\/vyvoj-zaznamovych-medii\/","about":["Technika"],"wordCount":435,"articleBody":"Za\u010dalo to nejjednodu\u0161\u0161\u00edm zp\u016fsobem, kter\u00fd bylo mo\u017eno pou\u017e\u00edt. Mechanika a elektronika ve sv\u00fdch po\u010d\u00e1tc\u00edch \u0161la ruku v ruce. Tak vznikl gramofon a gramofonov\u00e9 desky. Ka\u017ed\u00fd v\u00ed, jak takov\u00e1 v\u011bc vypad\u00e1, \u010dern\u00e1 kulat\u00e1 placka s vroubky. Jak ale ve skute\u010dnosti funguje? Do vinylov\u00e9 desky jsou mechanicky vyryty ve spir\u00e1le dr\u00e1\u017eky, skrz kter\u00e9 je pak vedena jehla, kter\u00e1 rozrezonuje zesilova\u010d, a tak p\u0159evede dr\u00e1\u017eky na zvuk. Jde tedy o jednoduch\u00fd z\u00e1pis, kter\u00fd vznik\u00e1 pouh\u00fdm vyryt\u00edm spir\u00e1ly na desku. Vr\u00fdv\u00e1n\u00ed je slo\u017eit\u00e1 procedura a nen\u00ed mo\u017eno ji jednoduch\u00fdm zp\u016fsobem jen tak urychlit, jeliko\u017e z\u00e1\u0159ez mus\u00ed b\u00fdt nesm\u00edrn\u011b p\u0159esn\u00fd a p\u0159i rychlej\u0161\u00ed v\u00fdrob\u011b se l\u00e1mou jehly, a to dokonce i ty nejtvrd\u0161\u00ed na sv\u011bt\u011b, a to ty diamantov\u00e9.
 
 D\u00e1le pak p\u0159i\u0161ly kazety. V\u0161ichni v\u00edme \u017ee se skl\u00e1daj\u00ed z magnetick\u00e9ho p\u00e1su, kter\u00fd je navinut na dvou kotou\u010d\u00edch. Magnetismus vznik\u00e1 pomoc\u00ed vlastnosti atom\u016f, kter\u00e1 se naz\u00fdv\u00e1 \u201espin\u201c \u010desky bychom \u0159ekli rotace kolem vlastn\u00ed osy. N\u011bkter\u00e9 atomy dosahuj\u00ed vy\u0161\u0161\u00edch rychlost\u00ed ot\u00e1\u010den\u00ed a t\u00edm p\u00e1dem i lep\u0161\u00edho magnetismu. Elektronick\u00e1 sou\u010d\u00e1stka zvan\u00e1 c\u00edvka pak dok\u00e1\u017ee p\u0159ev\u00e9st magnetick\u00e9 pole na pole elektrick\u00e9 a obr\u00e1cen\u011b. T\u00edmto zp\u016fsobem, tedy takzvanou indukc\u00ed je p\u0159ev\u00e1d\u011bn zvuk pr\u00e1v\u011b na magnetick\u00e9 kazety.
 Takzvan\u00e9 c\u00e9d\u00e9\u010dka pak funguj\u00ed na stejn\u00e9m principu jako ji\u017e zm\u00edn\u011bn\u00e9 desky. Jedin\u00fd podstatn\u00fd rozd\u00edl je v tom, \u017ee se nejedn\u00e1 o z\u00e1pis mechanick\u00fd, ale optick\u00fd. Vrstvi\u010dky se vypaluj\u00ed a \u010dtou pomoc\u00ed laserov\u00fdch paprsk\u016f. Z\u00e1rove\u0148 tak\u00e9 data nejsou zaznamen\u00e1v\u00e1na do spir\u00e1ly, ale do soust\u0159edn\u00fdch kru\u017enic. \u010ctec\u00ed za\u0159\u00edzen\u00ed pak v t\u011bchto kru\u017enic\u00edch vys\u00edl\u00e1 laserov\u00fd paprsek, kter\u00fd se bu\u010f odraz\u00ed, nebo je plochou disku pohlcen. Pokud se odraz\u00ed, je p\u0159eveden pomoc\u00ed fotorezistor\u016f na elektrick\u00fd sign\u00e1l.
 
 Posledn\u00ed nejjednodu\u0161\u0161\u00ed a nejrychlej\u0161\u00ed zp\u016fsob z\u00e1znamu dat je SSD. Tuto z\u00e1znamovou metodu zn\u00e1te mo\u017en\u00e1 pod n\u00e1zvem Flash disc. Jedn\u00e1 se ve skute\u010dnosti o slo\u017eitou soustavu tranzistor\u016f, kter\u00e9 mohou podle sm\u011bru sign\u00e1lu m\u00edt digit\u00e1ln\u00ed hodnotu 1 nebo 0. Jejich v\u00fdhodou je rychlost p\u0159enosu, jejich nev\u00fdhodou pak to, \u017ee maj\u00ed jednotliv\u00e9 tranzistory omezenou \u017eivotnost a postupn\u011b se takov\u00e9mu zisku sni\u017euje jeho kapacita.
 Co tedy mysl\u00edte \u017ee je lep\u0161\u00ed? Nov\u00e9 digit\u00e1ln\u00ed technologie a nebo p\u016fvodn\u00ed gramodesky?
                                                                                                                                                                                                                                                                                                                                                                                         4.3\/5 - (11 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"V\u00fdvoj z\u00e1znamov\u00fdch m\u00e9di\u00ed","item":"https:\/\/www.ajsa.cz\/vyvoj-zaznamovych-medii\/#breadcrumbitem"}]}]