{"id":249898,"date":"2023-05-02T08:25:00","date_gmt":"2023-05-02T05:25:00","guid":{"rendered":"https:\/\/howto.com.de\/mis-on-laserketas\/"},"modified":"2023-05-02T08:25:00","modified_gmt":"2023-05-02T05:25:00","slug":"mis-on-laserketas","status":"publish","type":"post","link":"https:\/\/howto.com.de\/et\/mis-on-laserketas\/","title":{"rendered":"Mis on laserketas?"},"content":{"rendered":"<p>\n  Laserkettad ilmuvad tehnoloogiana esimest korda eelmise sajandi 58. aastal. 61 aasta tehnoloogia patendi sai D. Gregg. Tehnoloogia, mida kasutatakse teabe salvestamiseks valgust l\u00e4bilaskvale kandjale.\n<\/p>\n<p>\n  1969 aastal l\u00f5i Philips esimese videoplaadi, kasutades valguse peegeldustehnoloogiat. Laserketta v\u00e4ljat\u00f6\u00f6tamise k\u00e4igus tekkis palju probleeme, nii tehnilisi kui ka <a href=\"\/recomendet-appsumo\" class=\"sds-arl\">kaubandus<\/a>likke. Philips \u00fchendab j\u00f5ud MCA-ga, et luua kaubanduslik laserplaat. See v\u00f5imaldas ettev\u00f5tetel saavutada m\u00f5ningast edu ja 72. aastal demonstreerida oma esimest laserplaati, mis tehti videoplaadina. Nad alustasid masstootmist 1978. aastal, mil turul domineerisid VHS-kassetid. Esimene film, mis ilmus esimesel laserkandjal, on &#8220;L\u00f5uad&#8221;.\n<\/p>\n<p>\n  Laserketta meetodi alused\n<\/p>\n<p>\n  Kuumutamise abil kantakse kettale teatud kaugusele punktid. Kui laser liigub \u00fcle ketta pinna, loetakse punkti kujul oleva s\u00fcvendi muutumine lihtsaks pinnaks &#8220;\u00fcheks&#8221;, punktide puudumine teatud kaugusel loetakse &#8220;nulliks&#8221;. \u00dcks-null aluseks on masinkood ehk v\u00e4ljendusrikkamalt \u00f6eldes mingi masinmorse kood. 12 cm l\u00e4bim\u00f5\u00f5duga ketta kohta on t\u00e4naseni teada mitmeid kuulujutte ja legende. K\u00f5ige ilusam neist on just see, mida on vaja Beethoveni \u00fcheksanda s\u00fcmfoonia salvestamiseks 16-bitise kodeeringuga ja helikvaliteediga 44,1 kHz.\n<\/p>\n<p>\n  See ei kuulunud erinevatel p\u00f5hjustel massikasutusse, seda kasutati kuni 2000. aastani. Laserplaadil kasutatud tehnoloogiad moodustasid CD-de ja DVD-de aluse.\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Laserplaat v\u00f5i CD on andmekandja. Enne v\u00e4lkm\u00e4lu v\u00f5i v\u00e4lkm\u00e4luseadmete tulekut on peamine andmekandja. Seda kasutatakse erineva teabe salvestamiseks samamoodi nagu v\u00e4lkm\u00e4lu.<\/p>\n","protected":false},"author":1,"featured_media":248732,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_wp_rev_ctl_limit":""},"categories":[520,520,677],"tags":[],"class_list":{"0":"post-249898","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-arvutid","9":"category-tehnoloogia"},"_links":{"self":[{"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/posts\/249898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/comments?post=249898"}],"version-history":[{"count":0,"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/posts\/249898\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/media\/248732"}],"wp:attachment":[{"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/media?parent=249898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/categories?post=249898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/howto.com.de\/et\/wp-json\/wp\/v2\/tags?post=249898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}