{"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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/","title":{"rendered":"Traitement du signal NFC : codage sans retour \u00e0 z\u00e9ro"},"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=\"Basculer la table des mati\u00e8res\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Basculer<\/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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/#Overview_of_NFC_Data_Transmission\" title=\"Pr\u00e9sentation de la transmission de donn\u00e9es NFC\">Pr\u00e9sentation de la transmission de donn\u00e9es 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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/#Standards_Communication_Protocols_in_NFC\" title=\"Normes et protocoles de communication NFC\">Normes et protocoles de communication dans 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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Non-Return-to-Zero_Level_NRZ-L_Encoding\" title=\"Codage NFC du niveau de non-retour \u00e0 z\u00e9ro (NRZ-L)\">Codage NFC du niveau de non-retour \u00e0 z\u00e9ro (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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Manchester_Encoding\" title=\"Codage NFC Manchester\">Codage 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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Modified_Miller_Encoding\" title=\"Codage Miller modifi\u00e9 NFC\">Codage Miller modifi\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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/#Types_of_Modulation_in_NFC\" title=\"Types de modulation dans NFC\">Types de modulation dans 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\/fr\/nfc-signal-processing-non-return-to-zero-encoding\/#In_Summary\" title=\"En r\u00e9sum\u00e9\">En r\u00e9sum\u00e9<\/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>Pr\u00e9sentation de la transmission de donn\u00e9es 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\/fr\/Wholesale\/rfid-nfc-reader\/\">NFC<\/a>, une technologie de communication sans fil \u00e0 faible d\u00e9bit et \u00e0 courte port\u00e9e, fonctionne gr\u00e2ce \u00e0 la synergie de deux dispositifs, appel\u00e9s initiateur et cible. Commun\u00e9ment appel\u00e9s \u00e9tiquette et lecteur, ces entit\u00e9s \u00e9changent des donn\u00e9es via une fr\u00e9quence porteuse RF de 13,56 MHz, en s&#039;appuyant sur l&#039;induction \u00e9lectromagn\u00e9tique sans contact. La proximit\u00e9 requise pour de telles interactions est g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 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>Normes et protocoles de communication dans 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\" \/>Bas\u00e9e sur des d\u00e9bits de donn\u00e9es variables, ainsi que sur des exigences distinctes en mati\u00e8re de modulation et de codage, la technologie NFC se manifeste par trois normes principales : NFC-A, NFC-B et NFC-F. Ces normes sont associ\u00e9es \u00e0 diff\u00e9rents types de modulation et de codage, comme illustr\u00e9 dans le tableau 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>Codage NFC du niveau de non-retour \u00e0 z\u00e9ro (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>Repr\u00e9sentation<\/em>:Le sch\u00e9ma de codage NRZ-L est repr\u00e9sent\u00e9 dans la Figure 1, o\u00f9 un \u00ab 1 \u00bb binaire est indiqu\u00e9 par une tension \u00e9lev\u00e9e (+ V) et un \u00ab 0 \u00bb binaire est indiqu\u00e9 par une tension basse (0 volt).<\/li>\n<li><em>Caract\u00e9ristiques<\/em>:\u00c9galement appel\u00e9 codage NRZ unipolaire, cette repr\u00e9sentation est simple, marquant chaque valeur de bit avec un niveau de tension distinct.<\/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>Codage 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>Variation<\/em>:Il existe deux variantes de codes Manchester : les types AC (bipolaire) et DC (unipolaire).<\/li>\n<li><em>Importance de la transition<\/em>:Les valeurs binaires \u00ab 1 \u00bb et \u00ab 0 \u00bb sont toutes deux caract\u00e9ris\u00e9es par des transitions de tension au sein de la m\u00eame p\u00e9riode binaire : du haut vers le bas signifie un \u00ab 1 \u00bb binaire, tandis que du bas vers le haut implique un \u00ab 0 \u00bb binaire.<\/li>\n<li><em>Pr\u00e9cision de transition<\/em>:Ces transitions sont m\u00e9ticuleusement plac\u00e9es au milieu de la p\u00e9riode binaire, renfor\u00e7ant la clart\u00e9 des signaux de donn\u00e9es.<\/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>Codage Miller modifi\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>Mappage binaire \u00ab\u00a01\u00a0\u00bb<\/em>:La logique binaire \u00ab\u00a01\u00a0\u00bb est invariablement indiqu\u00e9e par une transition de haut en bas, puis de nouveau \u00e0 haut dans la p\u00e9riode du bit, quel que soit l&#039;\u00e9tat du bit pr\u00e9c\u00e9dent.<\/li>\n<li><em>Mappage binaire \u00ab\u00a00\u00a0\u00bb<\/em>:La repr\u00e9sentation du \u00ab\u00a00\u00a0\u00bb binaire d\u00e9pend de la condition du bit pr\u00e9c\u00e9dent\u00a0: si le bit pr\u00e9c\u00e9dent \u00e9tait un \u00ab\u00a01\u00a0\u00bb, le z\u00e9ro actuel suit un mod\u00e8le de transition inverse, et s&#039;il s&#039;agissait d&#039;un \u00ab\u00a00\u00a0\u00bb, le mappage fait \u00e9cho \u00e0 celui d&#039;un \u00ab\u00a01\u00a0\u00bb binaire.<\/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>Types de modulation dans 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\" \/>La technologie NFC comprend une gamme de types de modulation tels que la modulation par d\u00e9placement d&#039;amplitude (ASK) dans les variantes 10% et 100% et utilise des techniques de modulation de charge. Ces m\u00e9thodes de modulation sont essentielles \u00e0 la pr\u00e9cision et \u00e0 l&#039;efficacit\u00e9 des protocoles de communication 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>En r\u00e9sum\u00e9<\/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\" \/>L&#039;architecture NFC repose sur des protocoles de modulation et de codage sophistiqu\u00e9s, chaque norme utilisant des m\u00e9canismes uniques pour assurer une communication s\u00e9curis\u00e9e et efficace entre les appareils proches. Que ce soit via les niveaux de tension du NRZ-L, les indications binaires bas\u00e9es sur la transition du Manchester ou les mappages d\u00e9pendants du contexte du Miller modifi\u00e9, la technologie NFC d\u00e9montre une adaptabilit\u00e9 \u00e0 une multitude d&#039;environnements et de besoins op\u00e9rationnels.<\/div>","protected":false},"excerpt":{"rendered":"<p>Pr\u00e9sentation de la transmission de donn\u00e9es NFC NFC, une technologie de communication sans fil \u00e0 faible d\u00e9bit et \u00e0 courte port\u00e9e, fonctionne gr\u00e2ce \u00e0 la synergie de deux dispositifs, appel\u00e9s initiateur et cible. Commun\u00e9ment connus sous le nom d\u2019\u00e9tiquette et de lecteur, ces entit\u00e9s \u00e9changent des donn\u00e9es via une fr\u00e9quence porteuse RF de 13,56 MHz, en s\u2019appuyant sur l\u2019induction \u00e9lectromagn\u00e9tique sans contact. [\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\/fr\/wp-json\/wp\/v2\/posts\/2561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/comments?post=2561"}],"version-history":[{"count":1,"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/posts\/2561\/revisions"}],"predecessor-version":[{"id":2566,"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/posts\/2561\/revisions\/2566"}],"wp:attachment":[{"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/media?parent=2561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/categories?post=2561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nfc-readers.com\/fr\/wp-json\/wp\/v2\/tags?post=2561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}