{"id":409,"date":"2015-08-06T15:01:00","date_gmt":"2015-08-06T15:01:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/tv-signal-processingclamping-and-blanking\/"},"modified":"2015-08-06T15:01:00","modified_gmt":"2015-08-06T15:01:00","slug":"tv-signal-processingclamping-and-blanking","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/tv-signal-processingclamping-and-blanking\/","title":{"rendered":"TV SIGNAL PROCESSING:CLAMPING AND BLANKING."},"content":{"rendered":"<div class=\"smmbe6a0dbb6e4a3b2\" ><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.smmbe6a0dbb6e4a3b2 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.smmbe6a0dbb6e4a3b2 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.smmbe6a0dbb6e4a3b2 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.smmbe6a0dbb6e4a3b2 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.smmbe6a0dbb6e4a3b2 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">CLAMPING AND BLANKING<\/h3>\n<p align=\"justify\">In a monochrome monitor or TV the route from video input socket or detector to picture-tube includes a low-level video ampli\ufb01er as an interface between the source and the output stage. Here or at the output stage itself, two services are required. Because the response of the entire video path is unlikely to extend to d.c. and very low frequencies, the video signal must be <i>c<\/i><i>lamped<\/i>. At some known reference level in the waveform (i.e. back-porch or line sync pulse tip) the signal is returned to a \ufb01xed voltage by a diode or transistor switch. DC restorers operate on a passive basis; <i>driven <\/i>clamps have better performance, using an electronic switch driven by a suitably timed pulse from the line scan or sync separator stage of the set. Clamping ensures that picture black-level always coincides with the cut-off point&nbsp; of the picture-tube, and remains stable with respect to time, temperature and picture content. <\/p>\n<p align=\"justify\">Blanking takes place at line and \ufb01eld scanning rate, and cuts off the video ampli\ufb01er except when picture information is actually present. Thus spurious images from the \ufb02yback action of the scanning spot (during which burst, teletext and other signals are present) are suppressed. <\/p><div class=\"vkiwr6a0dbb6e4a55a\" ><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.vkiwr6a0dbb6e4a55a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.vkiwr6a0dbb6e4a55a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.vkiwr6a0dbb6e4a55a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.vkiwr6a0dbb6e4a55a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.vkiwr6a0dbb6e4a55a {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"wachb6a0dbb6e4a495\" ><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.wachb6a0dbb6e4a495 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.wachb6a0dbb6e4a495 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.wachb6a0dbb6e4a495 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.wachb6a0dbb6e4a495 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.wachb6a0dbb6e4a495 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\">What has been described so far in this chapter, and in Chapter 3, completes the signal processing arrangements for monochrome TV sets and monitors.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CLAMPING AND BLANKING In a monochrome monitor or TV the route from video input socket or detector to picture-tube includes a low-level video ampli\ufb01er as an interface between the source and the output stage. Here or at the output stage itself, two services are required. Because the response of the entire video path is unlikely [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/tv-signal-processingclamping-and-blanking\/\" 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":750,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/409"}],"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=409"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/409\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=409"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=409"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}