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ICT系統集成

高清視頻會議解決方案

1 . 視頻會議需求分析

      1.1 背景分析

      視訊技術實現了語音、圖像、數據等信息綜合在一起的遠距離傳輸,使人們在進行異地交流時利用視訊技術既可以聽到對方的聲音,又可以看到對方的活動圖像和膠片內容,大大增強了異地交流的親切感和臨場感。在“效率至上”的信息社會中,通過視訊系統,進行協同工作時既可聽到對方的聲音,又可看到對方的圖像,大大增強了溝通的效果,在節約寶貴的時間、精力和金錢的同時,又提高管理和決策效率,充分發揮出視頻會議真實、高效、實時的優點,為人們提供了一種簡便而有效的協同工作手段。

      為了實現信息化,保證信息的快速、高效的傳輸,很多運營商與企業建設了基于寬帶多媒體業務的視頻會議系統。利用業界先進的視頻通訊技術,實現了視頻、語音和數據的視頻穩定傳輸,提高了寬帶網絡的利用率和辦公效率,并減少了差旅費用、日常會晤費用的支出,并為實時的溝通創造了條件。

      為此在規模較大的企業中部署視頻會議可以提升辦公效率、節省溝通成本加強各個部門或跨地域之間實現高清溝通,提高辦事效率和辦公效率。主要功能主要包括以下幾點:

        遠程培訓、行政會議、電視電話會議、遠程協助、遠程指導。

1.2 現狀分析

       建設的高清視頻會議系統依托于現有的企業IP數據網,基于H.323架構,能夠完全滿足高清視頻會議對網絡帶寬和網絡質量的要求。

      在實際的情況當中,往往客戶的現網同時承擔OA、財務、等流量數據的傳輸,由于視頻會議及時交互性的特點決定了視頻會議要求網絡速率上下行對等,所以必須保證視頻會議有固定帶寬保障,為了確保視頻會議召開期間,會議帶寬的穩定性,提出如下建議:

      1)、在網絡設備層面,開通流量管理等QOS保障手段,保證視頻會議的有足夠固定的帶寬;

         在標清(4CIF)視頻效果的情況下,建議每個會場帶寬建議不小于1M,雙流會議帶寬建議不小于1.5M;

         在高清(720P)視頻效果的情況下,建議每個會場帶寬建議不小于2M,雙流會議帶寬建議不小于3M

         在高清(1080P)視頻效果的情況下,建議每個會場帶寬建議不小于3M,雙流會議帶寬建議不小于4M

      2)、要求建立視頻會議專用網絡,以便于與其他業務獨立分開,保證良好的網絡質量,丟包率要求不超過5%

      3)、MCU平臺的匯聚帶寬為MCU下掛的會場終端帶寬以及級聯的下級MCU所占用帶寬需求總和的1.2倍。

1.3 建設范圍

       高清視頻會議系統建設基于H.323系統,以視頻會系統為主干,外加一些外圍的輔助視頻,滿足本地會議和遠程會議功能。其中主會場需要具有會議發言系統,攝像機跟蹤系統,中央控制系統。


2 . 組網方案

      整個系統采用IP傳輸網絡,基于標準的H.323架構,能夠實現高清的視頻效果,是一個開放的系統,視頻協議采用業界最通行的H.261H.263編碼和H.264編碼,可以為用戶提供高清視頻圖像。

      采用VideoIntensifierViewProcess技術,配合最新的H.264編碼技術,大大提高了圖像壓縮比,在同樣帶寬下,可向用戶提供更逼真、更清晰、更流暢的畫面。會議速率在128kbit/s時,圖像幀率達15/秒,會議速率在384kbit/s及以上時,圖像幀率達25/秒,可以達到良好的商用效果。根據用戶的實際配置需求,可以提供50/60/秒技術,在同等帶寬下,將屏幕刷新頻率增加一倍,增強圖象的流暢度。支持最高到8M的會議帶寬,可以為用戶提供動態高清晰圖像效果,使視訊會議進入到高清階段。

      支持最新的音頻編解碼協議AAC-LD/LC,該協議采用32K采樣率、碼率最高達96k,并且提供雙聲道語音支持,給實時通訊帶來CD級的音質效果。

      系統支持H.239雙視頻流和SXGA輸入/輸出特性,支持最高1280 × 1024分辨率,用戶直接通過帶內的方式就可以實現全景式會議,PowerPoint演講稿與Word演講稿可以同步顯示,能夠滿足日常工作培訓以及行政會議的要求。

       

       整個系統高可靠性: IP網口備份、、電源備份、芯片備份,保證視頻會議系統全天24小時,全年365天無故障運行。常用視訊組網方案,如下:

       視頻會議控制中心(總部機房):

       在視頻會議控制中心機房配置華為高清 MCU、會議管理平臺,全網由中心點會議管理平臺統一管理,全網資源的統一調度。

       高清 MCU支持1080P720P4CIFCIF視頻會議終端接入,MCU負責將所有會場的碼流進行處理與轉發;在召開3方以上的會議時,需要用到MCU作為核心設備負責會議的控制和轉發,該設備全年不用關心,放置在核心機房中間。

       會議管理平臺負責會議的召集、管理和結束等會議管理控制功能,通過會議管理平臺對這些碼流進行分發、交換、會議控制等;

       中心主會場(總部):

       針對會議室高清會場,配置華為高清視頻會議終端如9039STE50,同時配置專用HD高清視頻會議攝像機以及會議話筒、另外客戶需要自行配置大屏幕液晶電視、投影儀等設備,視頻會議終端通過IP傳輸網絡與中心MCU連接,在上傳信號時,音、視頻等數據經過視頻會議終端進行編碼后,通過網絡傳送到中心MCU進行轉發、控制等處理,在接受信號時,視頻會議終端通過IP傳輸網絡接受到MCU發來的數據,對音、視頻等數據進行解碼。

       會議分會場(分支):

       針對會議室高清分會場,配置華為高清視頻會議終端如9030TE30,同時配置專用HD高清視頻會議攝像機以及會議話筒、另外客戶需要自行配置大屏幕液晶電視、投影儀等設備,視頻會議終端通過IP傳輸網絡與中心MCU連接,在上傳信號時,音、視頻等數據經過視頻會議終端進行編碼后,通過網絡傳送到中心MCU進行轉發、控制等處理,在接受信號時,視頻會議終端通過IP傳輸網絡接受到MCU發來的數據,對音、視頻等數據進行解碼。詳細解決方案請參考高清會場會議室解決方案。

 

3 . 高清視頻方案特點

      3.1 全高清:

      華為視訊系統支持1080P1920×1080)活動圖像格式,20倍于傳統圖像的清晰度,畫面銳利清晰,色彩逼真鮮艷,極大的豐富了圖像的細節,可以很好的滿足企業、醫療、氣象、公檢法、政府、金融等要求高質量圖像的用戶。支持碼率控制策略、抗誤碼技術、糾錯處理技術、誤碼掩藏處理等新技術,使在同樣帶寬下,可以向用戶提供更逼真、更清晰、更流暢的畫面。

      3.2 高流暢性:

      華為視訊系統能夠支持50/60/秒滿幀率技術,相比較傳統的25/30/秒幀,圖像流暢度提高一倍,大幅度的提高圖像的流暢性能,能夠讓客戶體驗到極致流暢的視頻效果。

      3.3 高清靜態、動態雙流:

      支持標準的H.239全動態雙流和靜態雙流功能,不僅可以支持雙路1080P/30/1920×1080,720P/50/60/,720P/30幀(1280×720)高清晰全動態雙視頻流,更可提供高清動態會場圖像與超清晰PC內容(SXGA 1280×1024)同步傳送的靜態雙流。

      3.4 CD音質效果:

      采用AAC-LD寬頻的語音技術,語音質量有了大幅度的提高,可以到達CD音質效果。

      3.5 采用國際準協議:

      整個設計完全按照最新的國際標準和規范要求,支持H.320H.323以及SIP視頻框架協議,符合計算機、網絡通訊技術和視頻會議技術的最新發展潮流。高清視頻終端采用高清視頻標準接口--DVI高清視頻接口、SDI高清視頻接口,可以方便與外圍高清設備進行連接,實現與多種設備之間互通,同時可以根據客戶的實際需求,無縫地進行高清解決方案擴展,保護客戶前期視頻會議設備的投資,最大化利用設備。

 

祥云彩票
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