{"id":367,"date":"2015-08-08T15:24:00","date_gmt":"2015-08-08T15:24:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/video-on-magnetic-tapetwo-head-scanning\/"},"modified":"2015-08-08T15:24:00","modified_gmt":"2015-08-08T15:24:00","slug":"video-on-magnetic-tapetwo-head-scanning","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/video-on-magnetic-tapetwo-head-scanning\/","title":{"rendered":"VIDEO ON MAGNETIC TAPE:TWO-HEAD SCANNING."},"content":{"rendered":"<div class=\"mudjq6a0dbc43c2a9e\" ><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.mudjq6a0dbc43c2a9e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.mudjq6a0dbc43c2a9e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.mudjq6a0dbc43c2a9e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.mudjq6a0dbc43c2a9e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.mudjq6a0dbc43c2a9e {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">TWO-HEAD SCANNING<\/h3>\n<p align=\"justify\">Because the tape wrap only covers half the circumference of the head drum, and signal transfer must take place all the time, conventional domestic head drums are \ufb01tted with two video heads. As one leaves the tape wrap at the end of a scan, another (diametrically opposite) begins a new scan of the tape. The signals from each head are routed in turn into the replay ampli\ufb01ers by a switch during playback \u2013 the switch is synchronised by a head-position sensor associated with the head drum. During record both heads are driven with writing signals, though only the one traversing the tape is recording at any one moment. <\/p><div class=\"oxtsx6a0dbc43c7a7d\" ><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.oxtsx6a0dbc43c7a7d {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.oxtsx6a0dbc43c7a7d {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.oxtsx6a0dbc43c7a7d {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.oxtsx6a0dbc43c7a7d {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.oxtsx6a0dbc43c7a7d {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"quvqa6a0dbc43c79ab\" ><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.quvqa6a0dbc43c79ab {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.quvqa6a0dbc43c79ab {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.quvqa6a0dbc43c79ab {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.quvqa6a0dbc43c79ab {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.quvqa6a0dbc43c79ab {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<h4 align=\"justify\">Rotating transformer<\/h4>\n<p align=\"justify\">The transfer of video signals to and from the spinning video heads is accomplished by a rotating transformer whose ferrite core is arranged as two shallow discs concentric with the head drum itself. One half is stationary and the other rotates with the head disc, magnetic coupling between the two taking place via a very small air- gap. One pair of windings is provided for each head; in multi-head machines three or four pairs of windings are required. In a later chapter the use of separate rotary heads for hi-\ufb01 sound signal transfer is described \u2013 for these a separate rotary transformer assembly is usu- ally provided.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>TWO-HEAD SCANNING Because the tape wrap only covers half the circumference of the head drum, and signal transfer must take place all the time, conventional domestic head drums are \ufb01tted with two video heads. As one leaves the tape wrap at the end of a scan, another (diametrically opposite) begins a new scan of the [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/video-on-magnetic-tapetwo-head-scanning\/\" 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":727,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/367"}],"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=367"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/367\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=367"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}