{"id":29,"date":"2015-09-08T12:26:00","date_gmt":"2015-09-08T12:26:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/dvd-servo-control-and-the-error-signals\/"},"modified":"2015-09-08T12:26:00","modified_gmt":"2015-09-08T12:26:00","slug":"dvd-servo-control-and-the-error-signals","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/dvd-servo-control-and-the-error-signals\/","title":{"rendered":"DVD: Servo control and The error signals"},"content":{"rendered":"<div class=\"xpfva6a0dc84009b5c\" ><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.xpfva6a0dc84009b5c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.xpfva6a0dc84009b5c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.xpfva6a0dc84009b5c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.xpfva6a0dc84009b5c {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.xpfva6a0dc84009b5c {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">Servo control<\/h3>\n<p align=\"justify\">Figure 20.22 illustrates the main components of the servo control system of a DVD player. The RF amplifier receives the RF signal which it passes to the RF processor via a low pass filter (LPF). It also receives photo-detectors signals: A, B, C, D and so on from the optical head for infra-red, red and blue-laser discs formats. The photodiode signals are processed by the dig- ital servo RF amplifier to produce three error signals: focus error (FE), tracking error (TE) and <i>pull-i<\/i><i>n <\/i>(<i>P<\/i><i>I<\/i>) which are fed into the servo DSP for fur- ther processing. In addition, some players employ a fourth error signal, namely tilt (or skew) to detect and compensate for warped DVD discs.  <\/p><div class=\"tpzfx6a0dc84009c61\" ><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.tpzfx6a0dc84009c61 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.tpzfx6a0dc84009c61 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.tpzfx6a0dc84009c61 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.tpzfx6a0dc84009c61 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.tpzfx6a0dc84009c61 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"bldyy6a0dc84009bec\" ><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.bldyy6a0dc84009bec {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.bldyy6a0dc84009bec {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.bldyy6a0dc84009bec {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.bldyy6a0dc84009bec {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.bldyy6a0dc84009bec {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<h3 align=\"justify\">The error signals<\/h3>\n<p align=\"justify\">The servo DSP also receives a spindle control signal from the RF processor. The spindle control signal represents the data flow rate. A fast flow rate indi- cates a fast speed and vice versa. The servo DSP processes the servo input sig- nals and produce focus, tracking, spindle speed, sled and depending of the manufacturer, tilt (skew) control signals which are fed to the appropriate driv- ers on their way to the relevant actuators and motors. The servo DSP is fully programmed and controlled by the sys con microprocessor chip as shown.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Servo control Figure 20.22 illustrates the main components of the servo control system of a DVD player. The RF amplifier receives the RF signal which it passes to the RF processor via a low pass filter (LPF). It also receives photo-detectors signals: A, B, C, D and so on from the optical head for infra-red, [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/dvd-servo-control-and-the-error-signals\/\" 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":625,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/29"}],"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=29"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/29\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=29"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=29"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=29"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}