{"id":333,"date":"2015-08-25T14:25:00","date_gmt":"2015-08-25T14:25:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/servo-systemstilting-drum-technology\/"},"modified":"2015-08-25T14:25:00","modified_gmt":"2015-08-25T14:25:00","slug":"servo-systemstilting-drum-technology","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/servo-systemstilting-drum-technology\/","title":{"rendered":"SERVO SYSTEMS:TILTING DRUM TECHNOLOGY."},"content":{"rendered":"<div class=\"pmbwl6a0dbc77b6c78\" ><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.pmbwl6a0dbc77b6c78 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.pmbwl6a0dbc77b6c78 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.pmbwl6a0dbc77b6c78 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.pmbwl6a0dbc77b6c78 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.pmbwl6a0dbc77b6c78 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h6 align=\"justify\">TILTING DRUM TECHNOLOGY<\/h6>\n<p align=\"justify\">While a wide-head design can give excellent still-frame picture reproduction, playout of \u2018search\u2019 pictures in forward and reverse directions always gives rise to noise bars across the picture in conventional videorecorder designs \u2013 it is the inevitable result of multiple track crossings by the replay heads, as described on page  <\/p>\n<p align=\"justify\">280. To overcome the problem JVC designed a tilting head drum (<i>Dynamic Drum, DD System<\/i>) in which the entire drum assembly is canted, under servo control, to align the head sweeps with the tape tracks in search-forward and reverse-play modes; the effect and results are shown in Fig. 15.6, while Fig. 15.7 gives an idea of the working of the drum-tilt mechanism. In the rest state (record and normal-replay modes) the underside of the lower drum rests on four  <\/p>\n<p align=\"justify\"><a href=\"http:\/\/lh3.googleusercontent.com\/-7EwtaMDwf-c\/Vdx5GA-JLAI\/AAAAAAAB1a8\/FpKbgwwGJVg\/s1600-h\/SERVO-SYSTEMS-01932.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=\"SERVO SYSTEMS-0193\" border=\"0\" alt=\"SERVO SYSTEMS-0193\" src=\"http:\/\/lh3.googleusercontent.com\/-bLLZp7qbDkY\/Vdx5I_L5xYI\/AAAAAAAB1bQ\/vXHVUHQ8aMs\/SERVO-SYSTEMS-0193_thumb.jpg?imgmax=800\" width=\"244\" height=\"131\" \/><\/a>  <\/p><div class=\"qpcnj6a0dbc77b6e2e\" ><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.qpcnj6a0dbc77b6e2e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.qpcnj6a0dbc77b6e2e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.qpcnj6a0dbc77b6e2e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.qpcnj6a0dbc77b6e2e {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.qpcnj6a0dbc77b6e2e {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"fwvsu6a0dbc77b6d60\" ><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.fwvsu6a0dbc77b6d60 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.fwvsu6a0dbc77b6d60 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.fwvsu6a0dbc77b6d60 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.fwvsu6a0dbc77b6d60 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.fwvsu6a0dbc77b6d60 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\">fulcrum points. To tilt the assembly, the screws are rotated together by a motor so that the lower drum rests on two fulcrums whose individual heights are governed by the screw settings, and set by a servo loop whose reference is the off-tape video-f.m. signal. The total movement is measured in microns only, and has great precision and stability.  <\/p>\n<p align=\"justify\">\n","protected":false},"excerpt":{"rendered":"<p>TILTING DRUM TECHNOLOGY While a wide-head design can give excellent still-frame picture reproduction, playout of \u2018search\u2019 pictures in forward and reverse directions always gives rise to noise bars across the picture in conventional videorecorder designs \u2013 it is the inevitable result of multiple track crossings by the replay heads, as described on page 280. To [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/servo-systemstilting-drum-technology\/\" 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":638,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/333"}],"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=333"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/333\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=333"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}