{"id":226,"date":"2015-08-29T15:53:00","date_gmt":"2015-08-29T15:53:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/channel-encodinghigh-definition-terrestrial-television\/"},"modified":"2015-08-29T15:53:00","modified_gmt":"2015-08-29T15:53:00","slug":"channel-encodinghigh-definition-terrestrial-television","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/channel-encodinghigh-definition-terrestrial-television\/","title":{"rendered":"Channel encoding:High definition terrestrial television"},"content":{"rendered":"<div class=\"bhast6a0dbf1a9b2de\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '61e5902552e2353963d8d2f1bd1f4a8f',\n\t\t'format' : 'iframe',\n\t\t'height' : 250,\n\t\t'width' : 300,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/61e5902552e2353963d8d2f1bd1f4a8f\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.bhast6a0dbf1a9b2de {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.bhast6a0dbf1a9b2de {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.bhast6a0dbf1a9b2de {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.bhast6a0dbf1a9b2de {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.bhast6a0dbf1a9b2de {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">High definition terrestrial television<\/h3>\n<p align=\"justify\">In 2006, both the BBC and ITV started HD terrestrial broadcasts on a trial basis from Crystal Palace: channel 27 for the ITV and 31 for the BBC (Figure 8.17). Each HD multiplex occupied a standard 8 MHz bandwidth using 8K mode, 64-QAM, code rate 2\/3 and a guard period of 1\/32. A lower transmission power (10 dB below SD) was used to avoid any interference with adjacent analogue and digital channels.  <\/p>\n<p align=\"justify\"><strong>Satellite channel encoder<\/strong>  <\/p>\n<p align=\"justify\">Figure 8.18 shows the main components of a satellite DTV transmission sys- tem. The input signal is a multiplexed MPEG-2 transport stream consisting of 188-byte packets. The signal is first randomised with a pseudo-random bit sequencer, for energy dispersal. The Reed\u2013Solomon coding RS (204, 188)  <\/p>\n<p align=\"justify\"><a href=\"http:\/\/lh3.googleusercontent.com\/-6eNes_u4PGg\/VeHU8e2D3bI\/AAAAAAAB4Bs\/kc3TooRYnCk\/s1600-h\/Channel-encoding-05786.jpg\"><img decoding=\"async\" loading=\"lazy\" style=\"background-image: none; border-right-width: 0px; margin: 0px auto; padding-left: 0px; padding-right: 0px; display: block; float: none; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px\" title=\"Channel encoding-0578\" border=\"0\" alt=\"Channel encoding-0578\" src=\"http:\/\/lh3.googleusercontent.com\/-Jg2JMSeK3gE\/VeHVKrjUyaI\/AAAAAAAB4CE\/o3_AvKiS5oI\/Channel-encoding-0578_thumb1.jpg?imgmax=800\" width=\"359\" height=\"347\" \/><\/a>  <\/p><div class=\"nsjmi6a0dbf1a9b478\" ><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-0778475562755157\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- 300x600 television-and-video -->\n<ins class=\"adsbygoogle\"\n     style=\"display:inline-block;width:300px;height:600px\"\n     data-ad-client=\"ca-pub-0778475562755157\"\n     data-ad-slot=\"6549443290\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.nsjmi6a0dbf1a9b478 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.nsjmi6a0dbf1a9b478 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.nsjmi6a0dbf1a9b478 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.nsjmi6a0dbf1a9b478 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.nsjmi6a0dbf1a9b478 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"gbcms6a0dbf1a9b3b6\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '0c1eb4c533eaedb7b996f49a5a4983a9',\n\t\t'format' : 'iframe',\n\t\t'height' : 300,\n\t\t'width' : 160,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/0c1eb4c533eaedb7b996f49a5a4983a9\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.gbcms6a0dbf1a9b3b6 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.gbcms6a0dbf1a9b3b6 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.gbcms6a0dbf1a9b3b6 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.gbcms6a0dbf1a9b3b6 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.gbcms6a0dbf1a9b3b6 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\">\n<p align=\"justify\"><a href=\"http:\/\/lh3.googleusercontent.com\/-d3cNMdvquNI\/VeHVQvez5AI\/AAAAAAAB4Co\/HVNajNT_LwI\/s1600-h\/Channel-encoding-05792.jpg\"><img decoding=\"async\" loading=\"lazy\" style=\"background-image: none; border-right-width: 0px; margin: 0px auto; padding-left: 0px; padding-right: 0px; display: block; float: none; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px\" title=\"Channel encoding-0579\" border=\"0\" alt=\"Channel encoding-0579\" src=\"http:\/\/lh3.googleusercontent.com\/-pDE9FALAxiI\/VeHVdH9iTsI\/AAAAAAAB4Dc\/GRQD4MUvlrc\/Channel-encoding-0579_thumb.jpg?imgmax=800\" width=\"368\" height=\"157\" \/><\/a><\/p>\n<p align=\"justify\">&nbsp;<\/p>\n<p align=\"justify\">adds 16 bytes of error protection data to the packet, making a total of 204 bytes. There are then interleaved before entering the inner coder. The inner coder employs convolutional coding with a mother code rate of 1\/2. The convolutional code is then punctured to produce a code rate of 2\/3, 3\/4, 5\/6 or 7\/8 as determined by the service provider. The error-protected packets are now ready for the QPSK modulator before entering the satellite uplink interface for transmission to the transponder.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>High definition terrestrial television In 2006, both the BBC and ITV started HD terrestrial broadcasts on a trial basis from Crystal Palace: channel 27 for the ITV and 31 for the BBC (Figure 8.17). Each HD multiplex occupied a standard 8 MHz bandwidth using 8K mode, 64-QAM, code rate 2\/3 and a guard period of [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/channel-encodinghigh-definition-terrestrial-television\/\" class=\"more-link\" >Continue reading&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"aioseo_notices":[],"views":583,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/226"}],"collection":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/comments?post=226"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/226\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=226"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}