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src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364241757813/4198928.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="55r73l3" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364241757813/4198928.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="dr3h3vb" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</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>江西電視系統(tǒng),電視系統(tǒng)工程</p><p><span>***更新：</span>2020-10-29 00:36:57</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="vvnrfnt" 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="vp73bz7" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="ll3pplr" class="box"><p><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。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)性和時間相關(guān)性。一幀圖像內(nèi)的任何一個場景都是由若干像素點(diǎn)構(gòu)成的，因此一個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；一個節(jié)目中的一個情節(jié)常常由若干幀連續(xù)圖像組成的圖像序列構(gòu)成，一個圖像序列中前后幀圖像間也存在一定的關(guān)系，江西電視系統(tǒng)，這種關(guān)系叫做時間相關(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，江西電視系統(tǒng)，可以在保證一定的圖像質(zhì)量的前提下恢復(fù)原始圖像，江西電視系統(tǒng)。一個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。電視系統(tǒng)工程具備高速處理器和一定的存儲空間。江西電視系統(tǒng)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西電視系統(tǒng),電視系統(tǒng)工程" src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364241757813/4198928.png"></div><p style="text-indent:25px">數(shù)字電視系統(tǒng)工程的信源編譯碼技術(shù)：數(shù)字電視尤其數(shù)字高清晰度電視與模擬電視相比，在實(shí)現(xiàn)過程中，較為困難的部分就是對視頻信號和音頻信號的壓縮。數(shù)字電視的圖像不能象模擬電視的圖像和聲音那樣直接傳輸，而是要多一道壓縮編碼工序。視頻編碼技術(shù)主要功能是完成圖像的壓縮，使數(shù)字電視的信號傳輸量由995Mbit/s減少為20～30Mbit/s。與視頻編譯碼相同，音頻編譯碼主要功能是完成聲音信息的壓縮。在HDTV視頻壓縮編譯碼標(biāo)準(zhǔn)方面，都采用MPEG-2標(biāo)準(zhǔn)。MPEG壓縮后的信息可以供計算機(jī)處理，也可以在現(xiàn)有和將來的電視廣播頻道中進(jìn)行分配。江西電視系統(tǒng)電視系統(tǒng)工程是未來電視發(fā)展的主要趨勢。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西電視系統(tǒng),電視系統(tǒng)工程" src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364057958985/4799873.png"></div><p style="text-indent:25px">有線電視系統(tǒng)工程的組成：（1）信號源和機(jī)房設(shè)備。有線電視節(jié)目來源包括衛(wèi)星地面站接收的模擬和數(shù)字電視信號，本地微波站發(fā)射的電視信號，本地電視臺發(fā)射的電視信號等。為實(shí)現(xiàn)信號源的播放，機(jī)房內(nèi)應(yīng)有衛(wèi)星接收機(jī)、模擬和數(shù)字播放機(jī)、多功能控制臺、攝像機(jī)、特技圖文處理設(shè)備、編輯設(shè)備、視頻服務(wù)器，用戶管理控制設(shè)備等。（2）前端設(shè)備。前端設(shè)備是接在信號源與干線傳輸網(wǎng)絡(luò)之間的設(shè)備。它把接收來的電視信號進(jìn)行處理后，再把全部電視信號經(jīng)混合器混合，然后送入干線傳輸網(wǎng)絡(luò)，以實(shí)現(xiàn)多信號的單路傳輸。前端設(shè)備輸出信號頻率范圍可在5MHz—1GHz之間。前端輸出可接電纜干線，也可接光纜和微波干線。?</p><p style="text-indent:25px">電視系統(tǒng)工程的優(yōu)點(diǎn)：1、可以采用糾錯編碼技術(shù)提高電視機(jī)的抗噪聲干擾能力。2、數(shù)字電路成本低，無需調(diào)整、調(diào)諧，不會老化，所以生產(chǎn)成本降低，維修也容易。3、單向傳播。在進(jìn)行廣播電視數(shù)據(jù)傳播的時候，數(shù)字電視不需要使用許多附帶的其他組播技術(shù)的交換或者路由設(shè)備等等。在傳輸?shù)倪^程中，也不會因?yàn)樾盘査?的用戶較多、覆蓋范圍較廣，而影響傳輸?shù)木W(wǎng)絡(luò)信號穩(wěn)定性。它不會在傳輸中受到網(wǎng)絡(luò)中帶寬壓力的影響，同時也不會被程序員進(jìn)行攻擊。電視系統(tǒng)工程具備多種方式的交互式應(yīng)用。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西電視系統(tǒng),電視系統(tǒng)工程" src="https://tyunfile.71360.com/UploadFile/shxiongbei/637361364226435547/2360974.png"></div><p style="text-indent:25px">有線電視系統(tǒng)工程的基礎(chǔ)知識：常用有線電視器材。1、電纜：型號:常用電纜；75-5；75-7；75-9；75-12；發(fā)泡:單護(hù)發(fā)泡、雙護(hù)發(fā)泡；類型:發(fā)泡電纜、耦芯電纜、進(jìn)口電纜；特點(diǎn):頻率越高，損耗越多。2、放大器(高電平放大器、中電平放大器、低電平放大器)；A:高電平放大器用于天線放大器，用戶放大器，增益大在40dB以上，信噪比較差，輸入低60dB；特點(diǎn):低輸入，高輸出；B:中電平放大器用在支干線上，增益在25-30dB，如KA5134，信噪比較好。C:低電平放大器用在主干線上，增益在18-25dB，信噪比較好。電視系統(tǒng)工程接入方式有兩種，一是用數(shù)字電視接收機(jī)，二是用個人電腦。江西電視系統(tǒng)</p><p style="text-indent:25px">智能電視系統(tǒng)工程具備開放式操作系統(tǒng)與芯片。江西電視系統(tǒng)</p><p style="text-indent:25px">醫(yī)院電視系統(tǒng)工程的特點(diǎn)：系統(tǒng)采用閉路電視監(jiān)控領(lǐng)域中較具先進(jìn)的數(shù)字控制設(shè)備。采用標(biāo)準(zhǔn)化、模塊化設(shè)計，使系統(tǒng)具有很強(qiáng)的擴(kuò)展性、可維護(hù)性，并能與網(wǎng)絡(luò)互聯(lián)，實(shí)現(xiàn)遠(yuǎn)程控制。1.標(biāo)準(zhǔn)化結(jié)構(gòu)：單元機(jī)箱，進(jìn)行積木式組合，因而能方便地進(jìn)行系統(tǒng)擴(kuò)展。2系統(tǒng)的高可靠性，在線維護(hù):系統(tǒng)的所有模塊插板均支持在線熱插拔，出現(xiàn)故障需要檢修時，可在線維護(hù)，無需停機(jī)，就在設(shè)備運(yùn)行的同時可進(jìn)行維護(hù)檢修等活動。這完全符合醫(yī)院設(shè)備運(yùn)行的性質(zhì)和實(shí)際情況。江西電視系統(tǒng)</p><p style="text-indent:25px">上海熊貝信息技術(shù)有限公司總部位于青村鎮(zhèn)青村南路355號5幢135室，是一家從事計算機(jī)信息科技領(lǐng)域內(nèi)的技術(shù)開發(fā)、技術(shù)咨詢、技術(shù)服務(wù)、技術(shù)轉(zhuǎn)讓，弱電工程施工，通訊建設(shè)工程施工，電子與智能化建設(shè)工程專業(yè)施工，綜合布線，計算機(jī)網(wǎng)絡(luò)工程施工，設(shè)計、制作、代理。電視系統(tǒng)網(wǎng)絡(luò)搭建，監(jiān)控安防產(chǎn)品的設(shè)計搭建。的公司。上海熊貝擁有一支經(jīng)驗(yàn)豐富、技術(shù)創(chuàng)新的專業(yè)研發(fā)團(tuán)隊(duì)，以高度的專注和執(zhí)著為客戶提供IPTV電視系統(tǒng)，監(jiān)控系統(tǒng)，弱電工程，。上海熊貝致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對用戶產(chǎn)品上的貼心，為用戶帶來良好體驗(yàn)。上海熊貝始終關(guān)注安全、防護(hù)市場，以敏銳的市場洞察力，實(shí)現(xiàn)與客戶的成長共贏。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1749261.html</p></div></div></div></div></div><div id="pxzfxz3" class="page-right twoColRt"><div id="trvd5pf" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="vnzllvb" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" 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