{"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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/","title":{"rendered":"NFC-signalbehandling: Non-Return-to-Zero-kodning"},"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\">Indholdsfortegnelse<\/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=\"Skift indholdsfortegnelse\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Skift<\/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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/#Overview_of_NFC_Data_Transmission\" title=\"Oversigt over NFC-datatransmission\">Oversigt over NFC-datatransmission<\/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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/#Standards_Communication_Protocols_in_NFC\" title=\"Standarder og kommunikationsprotokoller i NFC\">Standarder og kommunikationsprotokoller i 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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Non-Return-to-Zero_Level_NRZ-L_Encoding\" title=\"NFC Non-Return-to-Zero Level (NRZ-L)-kodning\">NFC Non-Return-to-Zero Level (NRZ-L)-kodning<\/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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Manchester_Encoding\" title=\"NFC Manchester-kodning\">NFC Manchester-kodning<\/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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Modified_Miller_Encoding\" title=\"NFC-modificeret Miller-kodning\">NFC-modificeret Miller-kodning<\/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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/#Types_of_Modulation_in_NFC\" title=\"Typer af modulering i NFC\">Typer af modulering i 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\/da\/nfc-signal-processing-non-return-to-zero-encoding\/#In_Summary\" title=\"Sammenfattende\">Sammenfattende<\/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>Oversigt over NFC-datatransmission<\/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\/da\/Wholesale\/rfid-nfc-reader\/\">NFC<\/a>, en lav datahastighed og tr\u00e5dl\u00f8s kommunikationsteknologi med kort r\u00e6kkevidde, fungerer gennem en synergi af to enheder - betegnet som initiativtageren og m\u00e5let. Disse enheder, der almindeligvis er anerkendt som m\u00e6rket og l\u00e6seren, engagerer sig i dataudveksling via en RF-b\u00e6refrekvens p\u00e5 13,56 MHz, afh\u00e6ngig af kontaktl\u00f8s elektromagnetisk induktion. Den n\u00f8dvendige n\u00e6rhed til s\u00e5danne interaktioner er typisk mindre end 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>Standarder og kommunikationsprotokoller i 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\" \/>Baseret p\u00e5 varierende datahastigheder, sammen med s\u00e6rskilte modulerings- og kodningskrav, manifesteres NFC-teknologien gennem tre hovedstandarder: NFC-A, NFC-B og NFC-F. Disse standarder er forbundet med forskellige modulerings- og kodningstyper, som illustreret i Tabel-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 Non-Return-to-Zero Level (NRZ-L)-kodning<\/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>Repr\u00e6sentation<\/em>: NRZ-L-kodningsskemaet er afbildet i figur-1, hvor et bin\u00e6rt &#039;1&#039; er angivet med en h\u00f8jsp\u00e6nding (+V), og et bin\u00e6rt &#039;0&#039; er angivet med en lavsp\u00e6nding (0 volt).<\/li>\n<li><em>Karakteristisk<\/em>: Ogs\u00e5 kaldet unipol\u00e6r NRZ-kodning er denne repr\u00e6sentation ligetil og markerer hver bitv\u00e6rdi med et s\u00e6rskilt sp\u00e6ndingsniveau.<\/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 Manchester-kodning<\/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>Variation<\/em>: Der findes to varianter af Manchester-koder - AC (bipol\u00e6r) og DC (unipol\u00e6r) typer.<\/li>\n<li><em>Overgangsbetydning<\/em>: B\u00e5de bin\u00e6r &#039;1&#039; og &#039;0&#039; er karakteriseret ved sp\u00e6ndingsovergange inden for den samme bitperiode \u2013 H\u00f8j-til-Lav betyder et bin\u00e6rt &#039;1&#039;, mens Lav-til-H\u00f8j antyder bin\u00e6rt &#039;0&#039;.<\/li>\n<li><em>Overgangspr\u00e6cision<\/em>: Disse overgange er omhyggeligt placeret i midten af bitperioden, hvilket forst\u00e6rker klarheden af datasignaler.<\/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-modificeret Miller-kodning<\/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\u00e6r &#039;1&#039; kortl\u00e6gning<\/em>: Bin\u00e6r logik &#039;1&#039; er uv\u00e6gerligt angivet ved en overgang fra h\u00f8j til lav og derefter tilbage til h\u00f8j inden for bitperioden, uanset den foreg\u00e5ende bits tilstand.<\/li>\n<li><em>Bin\u00e6r &#039;0&#039; kortl\u00e6gning<\/em>: Skildringen af bin\u00e6r &#039;0&#039; er betinget af den foreg\u00e5ende bits tilstand - Hvis den forrige bit var en &#039;1&#039;, f\u00f8lger det nuv\u00e6rende nul et omvendt overgangsm\u00f8nster, og hvis det var et &#039;0&#039;, afspejler afbildningen det for en bin\u00e6r bit. &#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>Typer af modulering i 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 omfatter en r\u00e6kke modulationstyper s\u00e5som Amplitude Shift Keying (ASK) i b\u00e5de 10% og 100% varianter og anvender belastningsmodulationsteknikker. Disse moduleringsmetoder er en integreret del af pr\u00e6cisionen og effektiviteten af NFC-kommunikationsprotokoller.<\/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>Sammenfattende<\/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\" \/>NFCs arkitektur er baseret p\u00e5 sofistikerede modulerings- og kodningsprotokoller, hvor hver standard anvender unikke mekanismer til at sikre sikker og effektiv kommunikation mellem n\u00e6rliggende enheder. Uanset om det er gennem NRZ-L&#039;s sp\u00e6ndingsniveauer, Manchesters overgangsbaserede bin\u00e6re indikationer eller Modified Millers kontekstafh\u00e6ngige kortl\u00e6gninger, demonstrerer NFC-teknologi tilpasningsevne til en lang r\u00e6kke driftsmilj\u00f8er og behov.<\/div>","protected":false},"excerpt":{"rendered":"<p>Oversigt over NFC-datatransmission NFC, en lav datahastighed og tr\u00e5dl\u00f8s kommunikationsteknologi med kort r\u00e6kkevidde, fungerer gennem en synergi mellem to enheder \u2013 betegnet som initiativtageren og m\u00e5let. Disse enheder, der almindeligvis er anerkendt som m\u00e6rket og l\u00e6seren, engagerer sig i dataudveksling via en RF-b\u00e6refrekvens p\u00e5 13,56 MHz, afh\u00e6ngig af kontaktl\u00f8s elektromagnetisk induktion. Den [\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\/da\/wp-json\/wp\/v2\/posts\/2561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/comments?post=2561"}],"version-history":[{"count":1,"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/posts\/2561\/revisions"}],"predecessor-version":[{"id":2566,"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/posts\/2561\/revisions\/2566"}],"wp:attachment":[{"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/media?parent=2561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/categories?post=2561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nfc-readers.com\/da\/wp-json\/wp\/v2\/tags?post=2561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}