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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="hr4qszl" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364081054688/8057903.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="rfu3peq" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>數(shù)字電視系統(tǒng)改造方案報(bào)價(jià),電視系統(tǒng)工程</p><p><span>***更新：</span>2020-10-18 01:09:31</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="mga22m2" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海熊貝信息技術(shù)有限公司</a></p><p><span>聯(lián)系人：</span>唐繼兵</p><p><span>郵箱: </span>tangjibing988428@163.com</p><p><span>電話: </span>19901672612</p><p><span>傳真: </span>199_</p><p><span>網(wǎng)址: </span>http://www.shxiongbei.com</p><p><span>手機(jī): </span>199-0167</p><p><span>地址: </span>青村鎮(zhèn)青村南路355號(hào)5幢135室</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="lj3b2gq" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="cr4ba8o" class="box"><p><p style="text-indent:25px">電視系統(tǒng)工程的編碼壓縮方法：降低采樣頻率，數(shù)字電視系統(tǒng)改造方案報(bào)價(jià)。降低采樣頻率能夠壓縮碼率，但是，數(shù)字電視系統(tǒng)改造方案報(bào)價(jià)，奈奎斯特采樣定理指出，當(dāng)取樣頻率（fs）小于基帶頻率（fm）的2倍時(shí)，頻譜發(fā)生重疊，數(shù)字電視系統(tǒng)改造方案報(bào)價(jià)，則采用低通濾波器無法無失真地恢復(fù)原信號(hào)。由于電視圖像信號(hào)的能量主要集中在以行頻及其各次諧波頻率為中心的較窄范圍內(nèi)，中間存在很大的空隙，因此，若把取樣頻率選為半行頻的奇數(shù)倍，就可使fs<2fm時(shí)出現(xiàn)的頻譜混迭部分形成半行交錯(cuò)。于是，可以采用梳狀濾波器將其選出以較小的失真恢復(fù)原始信號(hào)。電視系統(tǒng)工程能完成傳統(tǒng)電視的解碼顯示功能。數(shù)字電視系統(tǒng)改造方案報(bào)價(jià)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="數(shù)字電視系統(tǒng)改造方案報(bào)價(jià),電視系統(tǒng)工程" src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364081054688/8057903.png"></div><p style="text-indent:25px">電視系統(tǒng)工程的編碼壓縮方法：差值脈沖編碼調(diào)制。標(biāo)準(zhǔn)數(shù)字電視采用的是主類和主級(jí)。概括地說，圖像壓縮的原理是利用了圖像中的兩種特性：空間相關(guān)性和時(shí)間相關(guān)性。一幀圖像內(nèi)的任何一個(gè)場(chǎng)景都是由若干像素點(diǎn)構(gòu)成的，因此一個(gè)像素通常與它周圍的某些像素在亮度和色度上存在一定的關(guān)系，這種關(guān)系叫做空間相關(guān)性；一個(gè)節(jié)目中的一個(gè)情節(jié)常常由若干幀連續(xù)圖像組成的圖像序列構(gòu)成，一個(gè)圖像序列中前后幀圖像間也存在一定的關(guān)系，這種關(guān)系叫做時(shí)間相關(guān)性。這兩種相關(guān)性使得圖像中存在大量的冗余信息。如果我們能將這些冗余信息去除，只傳輸少量非相關(guān)信息，就可以極大節(jié)省傳輸頻帶。而接收機(jī)利用這些非相關(guān)信息，按照一定的解碼算法，可以在保證一定的圖像質(zhì)量的前提下恢復(fù)原始圖像。一個(gè)好的壓縮編碼方案就是能夠較大限度地去除圖像中的冗余信息。南京有線電視系統(tǒng)方案電視系統(tǒng)工程可以連接公共互聯(lián)網(wǎng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="數(shù)字電視系統(tǒng)改造方案報(bào)價(jià),電視系統(tǒng)工程" src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364420468750/3246034.png"></div><p style="text-indent:25px">上海熊貝信息技術(shù)有限公司小編介紹，電視系統(tǒng)工程的優(yōu)點(diǎn)：1、很容易實(shí)現(xiàn)加密、干擾/解擾，以便擴(kuò)展各類收費(fèi)的廣播電視服務(wù)和其他專業(yè)應(yīng)用，如jun事、商業(yè)服務(wù)。2、便于與通信和計(jì)算機(jī)融合，有利于構(gòu)成國(guó)家信息高速傳輸網(wǎng)一種終端。這是因?yàn)橛?jì)算機(jī)技術(shù)中的存儲(chǔ)記錄數(shù)字信號(hào)的功能都可以用到電視信號(hào)上，例如磁帶錄像將逐漸被磁盤、光盤所代替。由于數(shù)字信號(hào)只有“1”和“0”，容易存儲(chǔ)，因而可普遍地用于圖像質(zhì)量改善，例如現(xiàn)在的100Hz電視就是將50Hz的電視畫面逐個(gè)存儲(chǔ)起來，每個(gè)畫面放兩次，因此觀眾就能看到更穩(wěn)定的電視圖像，感覺不到閃爍了。想要了解更多關(guān)于電視系統(tǒng)工程內(nèi)容，歡迎咨詢上海熊貝信息技術(shù)有限公司，我們將竭誠(chéng)為您服務(wù)。</p><p style="text-indent:25px">按照一定的規(guī)律，將時(shí)間和幅度上離散的信號(hào)用對(duì)應(yīng)的二進(jìn)制或多進(jìn)制代碼表示。電視通道數(shù)字化后的碼率太高，如果不加壓縮，一個(gè)通道就將占有100多兆赫的帶寬。因此，為了簡(jiǎn)化信號(hào)的傳輸與存儲(chǔ)，壓縮碼率是十分必要的。電視系統(tǒng)工程的編碼：線性變換編碼不直接對(duì)圖像數(shù)據(jù)編碼，而是首先將圖像數(shù)據(jù)進(jìn)行某種線性變換，得到一組變換系數(shù)，然后對(duì)這些系數(shù)實(shí)現(xiàn)量化、編碼、傳輸。在接收端，對(duì)收到的變換系數(shù)進(jìn)行相應(yīng)的逆變換，再恢復(fù)成圖像信號(hào)。從理論上講，線性變換編碼可以壓縮碼率的原因在于圖像信號(hào)存在很強(qiáng)的相關(guān)性，這種相關(guān)性在頻率域的反映是功率域?yàn)V波的方式獲得大的壓縮比。智能電視系統(tǒng)工程具有全開放式平臺(tái)，搭載了操作系統(tǒng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="數(shù)字電視系統(tǒng)改造方案報(bào)價(jià),電視系統(tǒng)工程" src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361363861396485/775064.png"></div><p style="text-indent:25px">隨著我國(guó)經(jīng)濟(jì)實(shí)力的不斷增強(qiáng)以及科技水平的不斷提升,有線電視技術(shù)在我國(guó)得到了飛速的發(fā)展和完善,極大地推動(dòng)我國(guó)電視行業(yè)的發(fā)展和進(jìn)步。從現(xiàn)階段有線電視技術(shù)應(yīng)用的現(xiàn)狀以及發(fā)展的趨勢(shì)來看,數(shù)字化,雙向化以及規(guī)?；瘜?huì)成為有線電視今后發(fā)展的主要方向。因此,在今后有線電視系統(tǒng)工程建設(shè)和設(shè)計(jì)的過程中,必須要加強(qiáng)對(duì)新技術(shù)的應(yīng)用,通過網(wǎng)絡(luò)技術(shù)和雙向技術(shù)的有效結(jié)合,來有效的提升有線電視系統(tǒng)工程建設(shè)的水平,為我國(guó)電視行業(yè)今后的可持續(xù)發(fā)展奠定堅(jiān)實(shí)的基礎(chǔ)。電視系統(tǒng)工程便于與通信和計(jì)算機(jī)融合，有利于構(gòu)成國(guó)家信息高速傳輸網(wǎng)一種終端。南京有線電視系統(tǒng)方案</p><p style="text-indent:25px">電視系統(tǒng)工程將推進(jìn)這一系列產(chǎn)業(yè)的發(fā)展。數(shù)字電視系統(tǒng)改造方案報(bào)價(jià)</p><p style="text-indent:25px">電視系統(tǒng)工程的優(yōu)點(diǎn)：1、圖像清晰度可接近于發(fā)射端信源部分的清晰度。其原因之一是信噪比與連續(xù)處理的次數(shù)無關(guān)，由于雜波主要疊加在傳輸信號(hào)上，而采用二進(jìn)制的數(shù)碼信號(hào)，通過整形以及引入的檢錯(cuò)技術(shù)，很容易把這些雜波的影響消掉，模擬信號(hào)在傳輸過程中噪聲會(huì)逐步累積，而數(shù)字信號(hào)在傳輸中不會(huì)產(chǎn)生新的噪聲，即信噪比可基本保持不變，所以模擬信號(hào)要求信噪比S/N≥40dB，而數(shù)字信號(hào)僅需≥20dB。原因之二是數(shù)字系統(tǒng)的非線性失真的影響很容易消掉，而模擬系統(tǒng)中的非線性失真會(huì)造成圖像畸變。數(shù)字電視系統(tǒng)改造方案報(bào)價(jià)</p><p style="text-indent:25px">上海熊貝信息技術(shù)有限公司致力于安全、防護(hù)，是一家服務(wù)型的公司。上海熊貝致力于為客戶提供良好的IPTV電視系統(tǒng)，監(jiān)控系統(tǒng)，弱電工程，，一切以用戶需求為中心，深受廣大客戶的歡迎。公司秉持誠(chéng)信為本的經(jīng)營(yíng)理念，在安全、防護(hù)深耕多年，以技術(shù)為先導(dǎo)，以自主產(chǎn)品為重點(diǎn)，發(fā)揮人才優(yōu)勢(shì)，打造安全、防護(hù)良好品牌。上海熊貝憑借創(chuàng)新的產(chǎn)品、專業(yè)的服務(wù)、眾多的成功案例積累起來的聲譽(yù)和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1596816.html</p></div></div></div></div></div><div id="kzof8fx" class="page-right twoColRt"><div id="ncmy2nu" class="box01 margin10 clearfix"><h3><a 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