{"id":406,"date":"2015-08-06T15:12:00","date_gmt":"2015-08-06T15:12:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/tv-signal-processingmultifunction-processing-chips\/"},"modified":"2015-08-06T15:12:00","modified_gmt":"2015-08-06T15:12:00","slug":"tv-signal-processingmultifunction-processing-chips","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/tv-signal-processingmultifunction-processing-chips\/","title":{"rendered":"TV SIGNAL PROCESSING:MULTIFUNCTION PROCESSING CHIPS."},"content":{"rendered":"<div class=\"hsyqj6a0dc91c8c6c1\" ><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.hsyqj6a0dc91c8c6c1 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.hsyqj6a0dc91c8c6c1 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.hsyqj6a0dc91c8c6c1 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.hsyqj6a0dc91c8c6c1 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.hsyqj6a0dc91c8c6c1 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">MULTIFUNCTION PROCESSING CHIPS<\/h3>\n<p align=\"justify\">As receiver technology has advanced the decoder IC arrangement illustrated in Fig. 7.6 (itself developed from 4-, 3- and 2-chip systems of earlier years) has been superseded by more highly integrated chips which incorporate the entire colour decoder, along with all the other low-power analogue processing sections of the receiver \u2013 Fig. 7.7 gives an example, where it can be seen that the i.f. output from the tuner and SAW \ufb01lter enters at the left and RGB video waveforms emerge at the right. Along the way are carried out sync separation and time- base generation, f.m. sound demodulation and processing, and multi- standard chroma decoding. <\/p>\n<p align=\"justify\">The section which interests us here is in the bottom right-hand side of the diagram, where lies the dual-standard PAL\/NTSC decoder with auto-recognition of the system in use; the 4.4 MHz crystal at pin 35 is for use with PAL, and the 3.6 MHz one at pin 34 for NTSC. The LC components connected to pin 36 form the loop \ufb01lter for the burst phase detector, and correspond to the network at pins 24\/25 of the IC in Fig. 7.6. All the user control functions (i.e. saturation) enter this IC via the I2C port at chip pins 7 and 8 in the form of serial data from the microcontroller IC \u2013 more details in Chapter 22. <\/p><div class=\"qnszm6a0dc91c8c881\" ><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.qnszm6a0dc91c8c881 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.qnszm6a0dc91c8c881 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.qnszm6a0dc91c8c881 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.qnszm6a0dc91c8c881 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.qnszm6a0dc91c8c881 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"zvaej6a0dc91c8c7ad\" ><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.zvaej6a0dc91c8c7ad {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.zvaej6a0dc91c8c7ad {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.zvaej6a0dc91c8c7ad {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.zvaej6a0dc91c8c7ad {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.zvaej6a0dc91c8c7ad {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\">The TDA4665 device connected between pins 29\/30 and 31\/32 in Fig. 7.7 is a 64 \u03bcs delay line using a \u2018bucket-brigade\u2019 (CCD) technique. Inside it are two sets of 192 capacitors in a progressive ladder arrange- ment, each capacitive rung connected to the next by an electronic switch. The switches are closed in sequence over a 64 \u03bcs period by an in-built clock oscillator at 3 MHz rate, line-locked by a sandcastle pulse. B\u2212Y and R\u2212Y signals are fed onto the ladder and \u2018chopped\u2019 into samples by the action of the \ufb01rst switch, then stepped sequentially along their own capacitor-ladders, re-entering the main IC after a one-line delay. Thus the function of the glass delay line described earlier is achieved by cheap electronics rather than costly mechanical\/ acoustic means. Wideband \u2018short\u2019 delays for luminance signals can also be realised using this technique and incorporated in multifunction processing ICs if required. <\/p>\n<p align=\"justify\">After the primary-colour matrix the RGB signals in the main chip pass to switches, controlled by the I2C bus, to permit the injection of RGB signals from (e.g.) a text decoder or a digital TV receiver box. Thereafter the RGB feeds, whatever their source, are controlled for brightness and contrast by the user (via the control bus) and the beam-limiter circuit; and individually for black-level point by a chip- internal process similar to that already described for automatic grey- scale tracking in the chip shown in Fig. 7.6.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MULTIFUNCTION PROCESSING CHIPS As receiver technology has advanced the decoder IC arrangement illustrated in Fig. 7.6 (itself developed from 4-, 3- and 2-chip systems of earlier years) has been superseded by more highly integrated chips which incorporate the entire colour decoder, along with all the other low-power analogue processing sections of the receiver \u2013 Fig. [&hellip;]<br \/><a href=\"http:\/\/machineryequipmentonline.com\/video-equipment\/tv-signal-processingmultifunction-processing-chips\/\" 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":599,"_links":{"self":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/406"}],"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=406"}],"version-history":[{"count":0,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/posts\/406\/revisions"}],"wp:attachment":[{"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/media?parent=406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/categories?post=406"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/machineryequipmentonline.com\/video-equipment\/wp-json\/wp\/v2\/tags?post=406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}