{"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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/","title":{"rendered":"X\u1eed l\u00fd t\u00edn hi\u1ec7u NFC: M\u00e3 h\u00f3a kh\u00f4ng tr\u1edf v\u1ec1 s\u1ed1 kh\u00f4ng"},"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\">M\u1ee5c l\u1ee5c<\/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=\"Chuy\u1ec3n \u0111\u1ed5i m\u1ee5c l\u1ee5c\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Chuy\u1ec3n \u0111\u1ed5i<\/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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/#Overview_of_NFC_Data_Transmission\" title=\"T\u1ed5ng quan v\u1ec1 truy\u1ec1n d\u1eef li\u1ec7u NFC\">T\u1ed5ng quan v\u1ec1 truy\u1ec1n d\u1eef li\u1ec7u 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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/#Standards_Communication_Protocols_in_NFC\" title=\"Ti\u00eau chu\u1ea9n &amp; Giao th\u1ee9c truy\u1ec1n th\u00f4ng trong NFC\">Ti\u00eau chu\u1ea9n &amp; Giao th\u1ee9c truy\u1ec1n th\u00f4ng trong 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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Non-Return-to-Zero_Level_NRZ-L_Encoding\" title=\"M\u00e3 h\u00f3a NFC kh\u00f4ng tr\u1edf v\u1ec1 m\u1ee9c kh\u00f4ng (NRZ-L)\">M\u00e3 h\u00f3a NFC kh\u00f4ng tr\u1edf v\u1ec1 m\u1ee9c kh\u00f4ng (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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Manchester_Encoding\" title=\"M\u00e3 h\u00f3a NFC Manchester\">M\u00e3 h\u00f3a 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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/#NFC_Modified_Miller_Encoding\" title=\"M\u00e3 h\u00f3a Miller \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i NFC\">M\u00e3 h\u00f3a Miller \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i 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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/#Types_of_Modulation_in_NFC\" title=\"C\u00e1c lo\u1ea1i \u0111i\u1ec1u ch\u1ebf trong NFC\">C\u00e1c lo\u1ea1i \u0111i\u1ec1u ch\u1ebf trong 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\/vi\/nfc-signal-processing-non-return-to-zero-encoding\/#In_Summary\" title=\"T\u00f3m t\u1eaft\">T\u00f3m t\u1eaft<\/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>T\u1ed5ng quan v\u1ec1 truy\u1ec1n d\u1eef li\u1ec7u 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\/vi\/Wholesale\/rfid-nfc-reader\/\">NFC<\/a>, m\u1ed9t c\u00f4ng ngh\u1ec7 truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y t\u1ea7m ng\u1eafn v\u00e0 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u th\u1ea5p, ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a hai thi\u1ebft b\u1ecb\u2014\u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 thi\u1ebft b\u1ecb kh\u1edfi t\u1ea1o v\u00e0 thi\u1ebft b\u1ecb m\u1ee5c ti\u00eau. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u1ebb v\u00e0 \u0111\u1ea7u \u0111\u1ecdc, c\u00e1c th\u1ef1c th\u1ec3 n\u00e0y tham gia trao \u0111\u1ed5i d\u1eef li\u1ec7u th\u00f4ng qua t\u1ea7n s\u1ed1 s\u00f3ng mang RF l\u00e0 13,56 MHz, d\u1ef1a tr\u00ean c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb kh\u00f4ng ti\u1ebfp x\u00fac. Kho\u1ea3ng c\u00e1ch c\u1ea7n thi\u1ebft cho c\u00e1c t\u01b0\u01a1ng t\u00e1c nh\u01b0 v\u1eady th\u01b0\u1eddng nh\u1ecf h\u01a1n 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>Ti\u00eau chu\u1ea9n &amp; Giao th\u1ee9c truy\u1ec1n th\u00f4ng trong 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\" \/>D\u1ef1a tr\u00ean c\u00e1c t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u kh\u00e1c nhau, c\u00f9ng v\u1edbi c\u00e1c y\u00eau c\u1ea7u \u0111i\u1ec1u ch\u1ebf v\u00e0 m\u00e3 h\u00f3a ri\u00eang bi\u1ec7t, c\u00f4ng ngh\u1ec7 NFC \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n th\u00f4ng qua ba ti\u00eau chu\u1ea9n ch\u00ednh: NFC-A, NFC-B v\u00e0 NFC-F. C\u00e1c ti\u00eau chu\u1ea9n n\u00e0y li\u00ean quan \u0111\u1ebfn c\u00e1c lo\u1ea1i \u0111i\u1ec1u ch\u1ebf v\u00e0 m\u00e3 h\u00f3a kh\u00e1c nhau, nh\u01b0 minh h\u1ecda trong B\u1ea3ng-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>M\u00e3 h\u00f3a NFC kh\u00f4ng tr\u1edf v\u1ec1 m\u1ee9c kh\u00f4ng (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>\u0110\u1ea1i di\u1ec7n<\/em>:S\u01a1 \u0111\u1ed3 m\u00e3 h\u00f3a NRZ-L \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 trong H\u00ecnh-1, trong \u0111\u00f3 s\u1ed1 nh\u1ecb ph\u00e2n &#039;1&#039; \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng \u0111i\u1ec7n \u00e1p cao (+V) v\u00e0 s\u1ed1 nh\u1ecb ph\u00e2n &#039;0&#039; \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng \u0111i\u1ec7n \u00e1p th\u1ea5p (0 v\u00f4n).<\/li>\n<li><em>\u0110\u1eb7c \u0111i\u1ec3m<\/em>:C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u00e3 h\u00f3a NRZ \u0111\u01a1n c\u1ef1c, c\u00e1ch bi\u1ec3u di\u1ec5n n\u00e0y r\u1ea5t \u0111\u01a1n gi\u1ea3n, \u0111\u00e1nh d\u1ea5u m\u1ed7i gi\u00e1 tr\u1ecb bit b\u1eb1ng m\u1ed9t m\u1ee9c \u0111i\u1ec7n \u00e1p ri\u00eang bi\u1ec7t.<\/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>M\u00e3 h\u00f3a 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>Bi\u1ebfn th\u1ec3<\/em>:C\u00f3 hai bi\u1ebfn th\u1ec3 c\u1ee7a m\u00e3 Manchester l\u00e0 lo\u1ea1i AC (l\u01b0\u1ee1ng c\u1ef1c) v\u00e0 lo\u1ea1i DC (\u0111\u01a1n c\u1ef1c).<\/li>\n<li><em>\u00dd ngh\u0129a c\u1ee7a s\u1ef1 chuy\u1ec3n \u0111\u1ed5i<\/em>: C\u1ea3 nh\u1ecb ph\u00e2n &#039;1&#039; v\u00e0 &#039;0&#039; \u0111\u1ec1u \u0111\u01b0\u1ee3c \u0111\u1eb7c tr\u01b0ng b\u1edfi s\u1ef1 chuy\u1ec3n \u0111\u1ed5i \u0111i\u1ec7n \u00e1p trong c\u00f9ng m\u1ed9t chu k\u1ef3 bit\u2014Cao xu\u1ed1ng Th\u1ea5p bi\u1ec3u th\u1ecb nh\u1ecb ph\u00e2n &#039;1&#039;, trong khi Th\u1ea5p xu\u1ed1ng Cao bi\u1ec3u th\u1ecb nh\u1ecb ph\u00e2n &#039;0&#039;.<\/li>\n<li><em>\u0110\u1ed9 ch\u00ednh x\u00e1c chuy\u1ec3n \u0111\u1ed5i<\/em>:Nh\u1eefng chuy\u1ec3n \u0111\u1ed5i n\u00e0y \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u1ec9 m\u1ec9 t\u1ea1i \u0111i\u1ec3m gi\u1eefa c\u1ee7a chu k\u1ef3 bit, t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 r\u00f5 n\u00e9t c\u1ee7a t\u00edn hi\u1ec7u d\u1eef li\u1ec7u.<\/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>M\u00e3 h\u00f3a Miller \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i 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>\u00c1nh x\u1ea1 nh\u1ecb ph\u00e2n &#039;1&#039;<\/em>: Logic nh\u1ecb ph\u00e2n &#039;1&#039; lu\u00f4n \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng s\u1ef1 chuy\u1ec3n \u0111\u1ed5i t\u1eeb cao xu\u1ed1ng th\u1ea5p r\u1ed3i l\u1ea1i tr\u1edf v\u1ec1 cao trong chu k\u1ef3 bit, b\u1ea5t k\u1ec3 tr\u1ea1ng th\u00e1i c\u1ee7a bit tr\u01b0\u1edbc \u0111\u00f3.<\/li>\n<li><em>\u00c1nh x\u1ea1 nh\u1ecb ph\u00e2n &#039;0&#039;<\/em>:M\u00f4 t\u1ea3 c\u1ee7a s\u1ed1 nh\u1ecb ph\u00e2n &#039;0&#039; ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec1u ki\u1ec7n c\u1ee7a bit tr\u01b0\u1edbc \u0111\u00f3\u2014N\u1ebfu bit tr\u01b0\u1edbc \u0111\u00f3 l\u00e0 &#039;1&#039;, s\u1ed1 kh\u00f4ng hi\u1ec7n t\u1ea1i tu\u00e2n theo m\u00f4 h\u00ecnh chuy\u1ec3n \u0111\u1ed5i ng\u01b0\u1ee3c l\u1ea1i v\u00e0 n\u1ebfu l\u00e0 &#039;0&#039;, \u00e1nh x\u1ea1 s\u1ebd ph\u1ea3n \u00e1nh m\u00f4 h\u00ecnh c\u1ee7a s\u1ed1 nh\u1ecb ph\u00e2n &#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>C\u00e1c lo\u1ea1i \u0111i\u1ec1u ch\u1ebf trong 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 bao g\u1ed3m m\u1ed9t lo\u1ea1t c\u00e1c lo\u1ea1i \u0111i\u1ec1u ch\u1ebf nh\u01b0 Amplitude Shift Keying (ASK) trong c\u1ea3 hai bi\u1ebfn th\u1ec3 10% v\u00e0 100% v\u00e0 s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt \u0111i\u1ec1u ch\u1ebf t\u1ea3i. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u ch\u1ebf n\u00e0y l\u00e0 m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ed1i v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng 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>T\u00f3m t\u1eaft<\/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\" \/>Ki\u1ebfn tr\u00fac c\u1ee7a NFC d\u1ef1a tr\u00ean c\u00e1c giao th\u1ee9c \u0111i\u1ec1u ch\u1ebf v\u00e0 m\u00e3 h\u00f3a tinh vi, v\u1edbi m\u1ed7i ti\u00eau chu\u1ea9n s\u1eed d\u1ee5ng c\u00e1c c\u01a1 ch\u1ebf ri\u00eang bi\u1ec7t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o giao ti\u1ebfp an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3 gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb g\u1ea7n k\u1ec1. Cho d\u00f9 th\u00f4ng qua c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p c\u1ee7a NRZ-L, c\u00e1c ch\u1ec9 b\u00e1o nh\u1ecb ph\u00e2n d\u1ef1a tr\u00ean qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i c\u1ee7a Manchester hay c\u00e1c \u00e1nh x\u1ea1 ph\u1ee5 thu\u1ed9c v\u00e0o ng\u1eef c\u1ea3nh c\u1ee7a Modified Miller, c\u00f4ng ngh\u1ec7 NFC \u0111\u1ec1u ch\u1ee9ng minh kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng v\u1edbi nhi\u1ec1u m\u00f4i tr\u01b0\u1eddng v\u00e0 nhu c\u1ea7u ho\u1ea1t \u0111\u1ed9ng.<\/div>","protected":false},"excerpt":{"rendered":"<p>T\u1ed5ng quan v\u1ec1 truy\u1ec1n d\u1eef li\u1ec7u NFC NFC, m\u1ed9t c\u00f4ng ngh\u1ec7 truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y t\u1ea7m ng\u1eafn v\u00e0 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u th\u1ea5p, ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a hai thi\u1ebft b\u1ecb\u2014\u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 thi\u1ebft b\u1ecb kh\u1edfi t\u1ea1o v\u00e0 thi\u1ebft b\u1ecb \u0111\u00edch. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u1ebb v\u00e0 \u0111\u1ea7u \u0111\u1ecdc, c\u00e1c th\u1ef1c th\u1ec3 n\u00e0y tham gia trao \u0111\u1ed5i d\u1eef li\u1ec7u th\u00f4ng qua t\u1ea7n s\u1ed1 s\u00f3ng mang RF l\u00e0 13,56 MHz, d\u1ef1a tr\u00ean c\u1ea3m \u1ee9ng \u0111i\u1ec7n t\u1eeb kh\u00f4ng ti\u1ebfp x\u00fac. [\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\/vi\/wp-json\/wp\/v2\/posts\/2561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/comments?post=2561"}],"version-history":[{"count":1,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/posts\/2561\/revisions"}],"predecessor-version":[{"id":2566,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/posts\/2561\/revisions\/2566"}],"wp:attachment":[{"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/media?parent=2561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/categories?post=2561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nfc-readers.com\/vi\/wp-json\/wp\/v2\/tags?post=2561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}