{"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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/","title":{"rendered":"NFC Signal Processing: Non-Return-to-Zero Encoding"},"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\">Table of Contents<\/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=\"P\u0159epnout obsah\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">P\u0159epnout<\/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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/#Overview_of_NFC_Data_Transmission\" title=\"P\u0159ehled p\u0159enosu dat NFC\">P\u0159ehled p\u0159enosu dat 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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/#Standards_Communication_Protocols_in_NFC\" title=\"Standardy a komunika\u010dn\u00ed protokoly v NFC\">Standardy a komunika\u010dn\u00ed protokoly 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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Non-Return-to-Zero_Level_NRZ-L_Encoding\" title=\"K\u00f3dov\u00e1n\u00ed NFC Non-Return-to-Zero Level (NRZ-L).\">K\u00f3dov\u00e1n\u00ed NFC Non-Return-to-Zero Level (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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Manchester_Encoding\" title=\"K\u00f3dov\u00e1n\u00ed NFC Manchester\">K\u00f3dov\u00e1n\u00ed NFC 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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Modified_Miller_Encoding\" title=\"Millerovo k\u00f3dov\u00e1n\u00ed upraven\u00e9 NFC\">Millerovo k\u00f3dov\u00e1n\u00ed upraven\u00e9 NFC<\/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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/#Types_of_Modulation_in_NFC\" title=\"Typy modulace v NFC\">Typy modulace 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\/cs\/nfc-signal-processing-non-return-to-zero-encoding\/#In_Summary\" title=\"V souhrnu\">V souhrnu<\/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>P\u0159ehled p\u0159enosu dat 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\/cs\/Wholesale\/rfid-nfc-reader\/\">NFC<\/a>, n\u00edzk\u00e1 datov\u00e1 rychlost a bezdr\u00e1tov\u00e1 komunika\u010dn\u00ed technologie kr\u00e1tk\u00e9ho dosahu, funguje prost\u0159ednictv\u00edm synergie dvou za\u0159\u00edzen\u00ed \u2013 naz\u00fdvan\u00fdch jako inici\u00e1tor a c\u00edl. Tyto entity, b\u011b\u017en\u011b zn\u00e1m\u00e9 jako \u0161t\u00edtky a \u010dte\u010dky, se zapojuj\u00ed do v\u00fdm\u011bny dat prost\u0159ednictv\u00edm RF nosn\u00e9 frekvence 13,56 MHz a spol\u00e9haj\u00ed na bezkontaktn\u00ed elektromagnetickou indukci. Po\u017eadovan\u00e1 bl\u00edzkost pro takov\u00e9 interakce je typicky men\u0161\u00ed ne\u017e 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>Standardy a komunika\u010dn\u00ed protokoly 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\" \/>Technologie NFC, zalo\u017een\u00e1 na r\u016fzn\u00fdch rychlostech p\u0159enosu dat, spolu s odli\u0161n\u00fdmi po\u017eadavky na modulaci a k\u00f3dov\u00e1n\u00ed, se projevuje prost\u0159ednictv\u00edm t\u0159\u00ed hlavn\u00edch standard\u016f: NFC-A, NFC-B a NFC-F. Tyto standardy jsou spojeny s r\u016fzn\u00fdmi typy modulace a k\u00f3dov\u00e1n\u00ed, jak ukazuje Tabulka-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>K\u00f3dov\u00e1n\u00ed NFC Non-Return-to-Zero Level (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>Zastoupen\u00ed<\/em>: Sch\u00e9ma k\u00f3dov\u00e1n\u00ed NRZ-L je zn\u00e1zorn\u011bno na obr\u00e1zku 1, kde bin\u00e1rn\u00ed &#039;1&#039; znamen\u00e1 vysok\u00e9 nap\u011bt\u00ed (+V) a bin\u00e1rn\u00ed &#039;0&#039; znamen\u00e1 n\u00edzk\u00e9 nap\u011bt\u00ed (0 volt\u016f).<\/li>\n<li><em>Charakteristick\u00fd<\/em>: Tato reprezentace, ozna\u010dovan\u00e1 tak\u00e9 jako unipol\u00e1rn\u00ed k\u00f3dov\u00e1n\u00ed NRZ, je p\u0159\u00edmo\u010dar\u00e1 a ozna\u010duje ka\u017edou bitovou hodnotu odli\u0161nou \u00farovn\u00ed nap\u011bt\u00ed.<\/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>K\u00f3dov\u00e1n\u00ed NFC 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>Variace<\/em>: Existuj\u00ed dv\u011b varianty k\u00f3d\u016f Manchester \u2013 AC (bipol\u00e1rn\u00ed) a DC (unipol\u00e1rn\u00ed) typy.<\/li>\n<li><em>V\u00fdznam p\u0159echodu<\/em>: Bin\u00e1rn\u00ed &#039;1&#039; i &#039;0&#039; jsou charakterizov\u00e1ny nap\u011b\u0165ov\u00fdmi p\u0159echody v r\u00e1mci stejn\u00e9 bitov\u00e9 periody \u2013 High-to-Low znamen\u00e1 bin\u00e1rn\u00ed &#039;1&#039;, zat\u00edmco Low-to-High implikuje bin\u00e1rn\u00ed &#039;0&#039;.<\/li>\n<li><em>P\u0159esnost p\u0159echodu<\/em>: Tyto p\u0159echody jsou pe\u010dliv\u011b um\u00edst\u011bny ve st\u0159edu bitov\u00e9 periody, \u010d\u00edm\u017e se zvy\u0161uje jasnost datov\u00fdch sign\u00e1l\u016f.<\/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>Millerovo k\u00f3dov\u00e1n\u00ed upraven\u00e9 NFC<\/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>Bin\u00e1rn\u00ed mapov\u00e1n\u00ed &#039;1&#039;<\/em>: Bin\u00e1rn\u00ed logika &#039;1&#039; je v\u017edy indikov\u00e1na p\u0159echodem z vysok\u00e9 na n\u00edzkou a pak zp\u011bt na vysokou b\u011bhem bitov\u00e9 periody, bez ohledu na stav p\u0159edchoz\u00edho bitu.<\/li>\n<li><em>Bin\u00e1rn\u00ed mapov\u00e1n\u00ed &#039;0&#039;<\/em>: Zobrazen\u00ed bin\u00e1rn\u00ed \u201e0\u201c z\u00e1vis\u00ed na podm\u00ednce p\u0159edchoz\u00edho bitu \u2013 pokud p\u0159edchoz\u00ed bit byl \u201e1\u201c, aktu\u00e1ln\u00ed nula se \u0159\u00edd\u00ed vzorem zp\u011btn\u00e9ho p\u0159echodu, a pokud byla \u201e0\u201c, mapov\u00e1n\u00ed odr\u00e1\u017e\u00ed mapov\u00e1n\u00ed bin\u00e1rn\u00edho &#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>Typy modulace 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 zahrnuje \u0159adu typ\u016f modulace, jako je Amplitude Shift Keying (ASK) ve variant\u00e1ch 10% i 100% a vyu\u017e\u00edv\u00e1 techniky modulace z\u00e1t\u011b\u017ee. Tyto modula\u010dn\u00ed metody jsou ned\u00edlnou sou\u010d\u00e1st\u00ed p\u0159esnosti a \u00fa\u010dinnosti komunika\u010dn\u00edch protokol\u016f 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 souhrnu<\/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\" \/>Architektura NFC je zalo\u017eena na sofistikovan\u00fdch modula\u010dn\u00edch a k\u00f3dovac\u00edch protokolech, p\u0159i\u010dem\u017e ka\u017ed\u00fd standard vyu\u017e\u00edv\u00e1 jedine\u010dn\u00e9 mechanismy k zaji\u0161t\u011bn\u00ed bezpe\u010dn\u00e9 a efektivn\u00ed komunikace mezi za\u0159\u00edzen\u00edmi v bl\u00edzkosti. A\u0165 u\u017e prost\u0159ednictv\u00edm nap\u011b\u0165ov\u00fdch \u00farovn\u00ed NRZ-L, bin\u00e1rn\u00edch indikac\u00ed zalo\u017een\u00fdch na p\u0159echodu Manchesteru nebo kontextov\u011b z\u00e1visl\u00fdch mapov\u00e1n\u00ed Modified Miller, technologie NFC demonstruje p\u0159izp\u016fsobivost mnoha provozn\u00edm prost\u0159ed\u00edm a pot\u0159eb\u00e1m.<\/div>","protected":false},"excerpt":{"rendered":"<p>P\u0159ehled p\u0159enosu dat NFC NFC, bezdr\u00e1tov\u00e1 komunika\u010dn\u00ed technologie s n\u00edzkou rychlost\u00ed p\u0159enosu dat a kr\u00e1tk\u00e9ho dosahu, funguje prost\u0159ednictv\u00edm synergie dvou za\u0159\u00edzen\u00ed \u2013 naz\u00fdvan\u00fdch jako inici\u00e1tor a c\u00edl. Tyto entity, b\u011b\u017en\u011b zn\u00e1m\u00e9 jako \u0161t\u00edtky a \u010dte\u010dky, se zapojuj\u00ed do v\u00fdm\u011bny dat prost\u0159ednictv\u00edm RF nosn\u00e9 frekvence 13,56 MHz a spol\u00e9haj\u00ed na bezkontaktn\u00ed elektromagnetickou indukci. [\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\/cs\/wp-json\/wp\/v2\/posts\/2561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/comments?post=2561"}],"version-history":[{"count":1,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/posts\/2561\/revisions"}],"predecessor-version":[{"id":2566,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/posts\/2561\/revisions\/2566"}],"wp:attachment":[{"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/media?parent=2561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/categories?post=2561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/tags?post=2561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}