{"id":22,"date":"2015-09-08T12:29:00","date_gmt":"2015-09-08T12:29:00","guid":{"rendered":""},"modified":"2015-10-08T07:03:22","modified_gmt":"2015-10-08T07:03:22","slug":"magnetic-tape-recordingreplay-considerations","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/magnetic-tape-recordingreplay-considerations\/","title":{"rendered":"Magnetic tape recording:Replay considerations"},"content":{"rendered":"<div class=\"mzczs6a0dce145394a\" ><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.mzczs6a0dce145394a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.mzczs6a0dce145394a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.mzczs6a0dce145394a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.mzczs6a0dce145394a {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.mzczs6a0dce145394a {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">Replay considerations<\/h3>\n<p align=\"justify\">As with any magnetic transfer system, the output from the replay head is proportional to the \u2018rate of change\u2019 of magnetic flux. Thus, assuming a constant flux density on the recorded tape, the replay head output will  <\/p>\n<p align=\"justify\"><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-content\/uploads\/2015\/09\/Television-and-Video-Technology-0147-25255B2-25255D.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=\"Television and Video Technology-0147\" border=\"0\" alt=\"Television and Video Technology-0147\" src=\"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-content\/uploads\/2015\/09\/Television-and-Video-Technology-0147-25255B2-25255D-300x152.jpg\" width=\"340\" height=\"174\" \/><\/a><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-content\/uploads\/2015\/09\/Television-and-Video-Technology-0148-25255B2-25255D.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=\"Television and Video Technology-0148\" border=\"0\" alt=\"Television and Video Technology-0148\" src=\"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-content\/uploads\/2015\/09\/Television-and-Video-Technology-0148-25255B2-25255D-300x178.jpg\" width=\"333\" height=\"199\" \/><\/a>  <\/p><div class=\"pxnza6a0dce1453a59\" ><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.pxnza6a0dce1453a59 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.pxnza6a0dce1453a59 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.pxnza6a0dce1453a59 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.pxnza6a0dce1453a59 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.pxnza6a0dce1453a59 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"legbm6a0dce14539dd\" ><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.legbm6a0dce14539dd {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.legbm6a0dce14539dd {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.legbm6a0dce14539dd {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.legbm6a0dce14539dd {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.legbm6a0dce14539dd {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\">double for each doubling of frequency. With a doubling of frequency known as an octave and a doubling of voltage being 6 dB, the relationship 6 dB\/octave holds good until the extinction frequency, <i>f<\/i>ex, is approached, when the head output rapidly falls towards zero. This is shown in Figure  <\/p>\n<p align=\"justify\">The upper limit of the curve is governed by the level of the signal recorded on the tape, limited in turn by the tape\u2019s magnetic saturation point. At the low-frequency end, the replay head output is low due to the low rate of change of the off-tape flux. At some point, it will be lost in the \u2018noise\u2019 off-tape, and this will occur at about 60 dB down from peak level. Thus, even with playback equalisation (represented by the dotted curve in Figure 21.8), the dynamic range of the system is confined to 60 dB or so. With the unalterable 6 dB\/octave characteristic, we are limited, then, to a total recording range of 10 octaves. This is inherent in the tape system and applies equally to audio and video signals. Ten octaves will afford an audio response from 20 Hz to 20 kHz, which is quite adequate. TV pictures, however, even substandard ones for domestic entertainment, demand an octave range approaching 18 and this is plainly not possible.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Replay considerations As with any magnetic transfer system, the output from the replay head is proportional to the \u2018rate of change\u2019 of magnetic flux. Thus, assuming a constant flux density on the recorded tape, the replay head output will double for each doubling of frequency. With a doubling of frequency known as an octave and [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/magnetic-tape-recordingreplay-considerations\/\" class=\"more-link\" >Continue reading&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":497,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"aioseo_notices":[],"views":633,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/22"}],"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=22"}],"version-history":[{"count":1,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/22\/revisions"}],"predecessor-version":[{"id":499,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/22\/revisions\/499"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media\/497"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=22"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=22"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=22"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}