{"id":2561,"date":"2024-05-24T02:15:24","date_gmt":"2024-05-24T02:15:24","guid":{"rendered":"https:\/\/nfc-readers.com\/?p=2561"},"modified":"2024-05-24T02:15:24","modified_gmt":"2024-05-24T02:15:24","slug":"nfc-signal-processing-non-return-to-zero-encoding","status":"publish","type":"post","link":"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/","title":{"rendered":"Obdelava signala NFC: kodiranje brez povratka na ni\u010d"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Kazalo<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Preklopi kazalo vsebine\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Preklopi<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/#Overview_of_NFC_Data_Transmission\" title=\"Pregled prenosa podatkov NFC\">Pregled prenosa podatkov NFC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/#Standards_Communication_Protocols_in_NFC\" title=\"Standardi in komunikacijski protokoli v NFC\">Standardi in komunikacijski protokoli v NFC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Non-Return-to-Zero_Level_NRZ-L_Encoding\" title=\"NFC kodiranje brez vrnitve na ni\u010delno raven (NRZ-L).\">NFC kodiranje brez vrnitve na ni\u010delno raven (NRZ-L).<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Manchester_Encoding\" title=\"NFC kodiranje Manchester\">NFC kodiranje Manchester<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Modified_Miller_Encoding\" title=\"NFC spremenjeno Millerjevo kodiranje\">NFC spremenjeno Millerjevo kodiranje<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/#Types_of_Modulation_in_NFC\" title=\"Vrste modulacije v NFC\">Vrste modulacije v NFC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/nfc-readers.com\/sl\/nfc-signal-processing-non-return-to-zero-encoding\/#In_Summary\" title=\"V povzetku\">V povzetku<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><span class=\"ez-toc-section\" id=\"Overview_of_NFC_Data_Transmission\"><\/span><strong>Pregled prenosa podatkov NFC<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><br class=\"container_a4d0b wrapper_d536d undefined\" \/><a href=\"https:\/\/nfc-readers.com\/sl\/Wholesale\/rfid-nfc-reader\/\">NFC<\/a>, tehnologija brez\u017ei\u010dne komunikacije z nizko hitrostjo prenosa podatkov in kratkega dosega, deluje prek sinergije dveh naprav \u2013 imenovanih iniciator in cilj. Te entitete, ki so splo\u0161no znane kot oznaka in \u010ditalnik, sodelujejo pri izmenjavi podatkov prek RF nosilne frekvence 13,56 MHz, pri \u010demer se opirajo na brezkontaktno elektromagnetno indukcijo. Zahtevana bli\u017eina za tak\u0161ne interakcije je obi\u010dajno manj\u0161a od 10 cm.<\/div>\n<p>&nbsp;<\/p>\n<h2 class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><span class=\"ez-toc-section\" id=\"Standards_Communication_Protocols_in_NFC\"><\/span><strong>Standardi in komunikacijski protokoli v NFC<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><br class=\"container_a4d0b wrapper_d536d undefined\" \/>Na podlagi razli\u010dnih hitrosti prenosa podatkov, skupaj z razli\u010dnimi zahtevami glede modulacije in kodiranja, se tehnologija NFC ka\u017ee v treh glavnih standardih: NFC-A, NFC-B in NFC-F. Ti standardi so povezani z razli\u010dnimi tipi modulacije in kodiranja, kot je prikazano v tabeli 1.<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-2562\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NFC-NRZ-L-Coding11-300x125.png\" alt=\"\" width=\"564\" height=\"235\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NFC-NRZ-L-Coding11-300x125.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NFC-NRZ-L-Coding11-1024x427.png 1024w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NFC-NRZ-L-Coding11-768x320.png 768w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NFC-NRZ-L-Coding11-18x8.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NFC-NRZ-L-Coding11-600x250.png 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NFC-NRZ-L-Coding11.png 1275w\" sizes=\"auto, (max-width: 564px) 100vw, 564px\" \/><\/p>\n<h2 class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><span class=\"ez-toc-section\" id=\"NFC_Non-Return-to-Zero_Level_NRZ-L_Encoding\"><\/span><strong>NFC kodiranje brez vrnitve na ni\u010delno raven (NRZ-L).<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"image-wrapper_dd1b3 clickable_dd1b3\" data-testid=\"mdbox_image\"><img decoding=\"async\" src=\"data:;base64,<svg xmlns='http:\/\/www.w3.org\/2000\/svg' version='1.1' width='400' height='256'\/>&#8221; alt=&#8221;&#8221; aria-hidden=&#8221;true&#8221; \/><img loading=\"lazy\" class=\"alignnone  wp-image-2563\" alt=\"\" width=\"559\" height=\"311\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NRZ-L-coding-300x167.webp 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NRZ-L-coding-18x10.webp 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/NRZ-L-coding.webp 596w\" sizes=\"auto, (max-width: 559px) 100vw, 559px\" \/><\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li><em>Zastopanje<\/em>: Shema kodiranja NRZ-L je prikazana na sliki 1, kjer je binarni &#039;1&#039; ozna\u010den z visoko napetostjo (+V), binarni &#039;0&#039; pa je ozna\u010den z nizko napetostjo (0 voltov).<\/li>\n<li><em>Zna\u010dilno<\/em>: Ta predstavitev, imenovana tudi unipolarno kodiranje NRZ, je enostavna in vsako bitno vrednost ozna\u010duje z lo\u010deno napetostno ravnjo.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2 class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><span class=\"ez-toc-section\" id=\"NFC_Manchester_Encoding\"><\/span><strong>NFC kodiranje Manchester<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"image-wrapper_dd1b3 clickable_dd1b3\" data-testid=\"mdbox_image\"><img decoding=\"async\" src=\"data:;base64,<svg xmlns='http:\/\/www.w3.org\/2000\/svg' version='1.1' width='400' height='256'\/>&#8221; alt=&#8221;&#8221; aria-hidden=&#8221;true&#8221; \/><\/div><p><img loading=\"lazy\" class=\"alignnone  wp-image-2564\" alt=\"\" width=\"520\" height=\"414\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/Manchester-coding-300x239.webp 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/Manchester-coding-15x12.webp 15w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/Manchester-coding-600x478.webp 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/Manchester-coding.webp 639w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li><em>Razli\u010dica<\/em>: Obstajata dve razli\u010dici Manchestrskih kod \u2013 AC (bipolarni) in DC (unipolarni) tipi.<\/li>\n<li><em>Prehodni pomen<\/em>: Za binarni &#039;1&#039; in &#039;0&#039; so zna\u010dilni napetostni prehodi v istem bitnem obdobju - Visoko v Nizko pomeni binarno &#039;1&#039;, medtem ko Nizko v Visoko implicira binarno &#039;0&#039;.<\/li>\n<li><em>Natan\u010dnost prehoda<\/em>: Ti prehodi so natan\u010dno postavljeni na sredino bitnega obdobja, kar krepi jasnost podatkovnih signalov.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2 class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><span class=\"ez-toc-section\" id=\"NFC_Modified_Miller_Encoding\"><\/span><strong>NFC spremenjeno Millerjevo kodiranje<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"image-wrapper_dd1b3 clickable_dd1b3\" data-testid=\"mdbox_image\"><img decoding=\"async\" src=\"data:;base64,<svg xmlns='http:\/\/www.w3.org\/2000\/svg' version='1.1' width='400' height='256'\/>&#8221; alt=&#8221;&#8221; aria-hidden=&#8221;true&#8221; \/><img loading=\"lazy\" class=\"alignnone  wp-image-2565\" alt=\"\" width=\"496\" height=\"276\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/Modified-Miller-coding-300x167.webp 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/Modified-Miller-coding-18x10.webp 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/05\/Modified-Miller-coding.webp 565w\" sizes=\"auto, (max-width: 496px) 100vw, 496px\" \/><\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li><em>Binarno preslikavo &#039;1&#039;<\/em>: Binarna logika &#039;1&#039; je vedno ozna\u010dena s prehodom iz visokega v nizko in nato nazaj v visoko znotraj bitnega obdobja, ne glede na stanje prej\u0161njega bita.<\/li>\n<li><em>Binarno preslikavo &#039;0&#039;<\/em>: Prikaz binarnega &#039;0&#039; je odvisen od pogoja predhodnega bita \u2013 \u010de je bil prej\u0161nji bit &#039;1&#039;, trenutna ni\u010dla sledi vzorcu obratnega prehoda, in \u010de je bil &#039;0&#039;, preslikava odmeva kot binarni &#039;1&#039;.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2 class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><span class=\"ez-toc-section\" id=\"Types_of_Modulation_in_NFC\"><\/span><strong>Vrste modulacije v NFC<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><br class=\"container_a4d0b wrapper_d536d undefined\" \/>NFC zajema vrsto vrst modulacije, kot je Amplitude Shift Keying (ASK) v obeh razli\u010dicah 10% in 100%, in uporablja tehnike modulacije obremenitve. Te metode modulacije so sestavni del natan\u010dnosti in u\u010dinkovitosti komunikacijskih protokolov NFC.<\/div>\n<p>&nbsp;<\/p>\n<h2 class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><span class=\"ez-toc-section\" id=\"In_Summary\"><\/span><strong>V povzetku<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph_c9271 paragraph-element\"><br class=\"container_a4d0b wrapper_d536d undefined\" \/>Arhitektura NFC temelji na sofisticiranih modulacijskih in kodirnih protokolih, pri \u010demer vsak standard uporablja edinstvene mehanizme za zagotavljanje varne in u\u010dinkovite komunikacije med napravami v neposredni bli\u017eini. Ne glede na to, ali prek napetostnih ravni NRZ-L, Manchestrovih binarnih indikacij, ki temeljijo na prehodih, ali modificiranih Millerjevih kontekstno odvisnih preslikav, tehnologija NFC dokazuje prilagodljivost \u0161tevilnim delovnim okoljem in potrebam.<\/div>","protected":false},"excerpt":{"rendered":"<p>Pregled prenosa podatkov NFC NFC, tehnologija za brez\u017ei\u010dno komunikacijo z nizko hitrostjo prenosa podatkov in kratkega dosega, deluje prek sinergije dveh naprav, imenovanih iniciator in cilj. Te entitete, ki so splo\u0161no znane kot oznaka in \u010ditalnik, sodelujejo pri izmenjavi podatkov prek RF nosilne frekvence 13,56 MHz, pri \u010demer se zana\u0161ajo na brezkontaktno elektromagnetno indukcijo. [\u2026]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2561","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/posts\/2561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/comments?post=2561"}],"version-history":[{"count":1,"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/posts\/2561\/revisions"}],"predecessor-version":[{"id":2566,"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/posts\/2561\/revisions\/2566"}],"wp:attachment":[{"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/media?parent=2561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/categories?post=2561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nfc-readers.com\/sl\/wp-json\/wp\/v2\/tags?post=2561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}