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題名 | 高畫質視訊及其在視覺通訊服務之應用 |
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作者 | 甘果碩; 龍竹盛; 謝文生; 孫三為; 陳鏡明; 張有泉; 李蘇民; | 書刊名 | 電信研究 |
卷期 | 23:5 1993.10[民82.10] |
頁次 | 頁721-742 |
分類號 | 448.889 |
關鍵詞 | 高畫質視訊; 視覺通訊服務; |
語文 | 中文(Chinese) |
中文摘要 | 日本遠在二十年前卽已著手發展高解析電視系統MUSE,西歐國家隨後以整體力量組成Eureka跟進,形成第二大系統HD-MAC。他們的共同特徵在於採用了混合類比/數位電子處理技術,且著重運用頻帶壓縮方式達成降低傳送頻寬的目的。美國在高解析電視系統方面的進展於1988年聯邦通訊委員會FCC(Federal Communication Committee)公佈了以同步廣播(Simultance Broadcast-Simulcast)及頻寬不得超過6MHz為主的規範之後,才逐漸積極地進入雛型系統的研製與測試;而1990年以前的設計其架構和日本、西歐大致類似,但是要在6MHz的頻寬之內提供高畫質視訊、音訊及數據仍有實際上的困難;1990年下旬通用電子(General Instrument)利用全數位化信號處理技術所提出的草案達到了相關的需求,此一戲劇性的改變不但為沉寂已久的美國電訊工業注入新的活力,它的出現更被視為第三次產業革命。 以視覺為主的訊息傳遞在先天上就有其限制--信息量太過龐大,特別是高解析的視訊(Video),如果依照目前大多數的高解析電視畫面的大小1440×960,彩色R、G、B、24位元來計算每秒鐘約需10億位元才定以傳送,這種天文數字卽使能克服通訊上的困難,其成本必然十分高昂,因此,資料的減量、壓縮使整體性的費用符合經濟規模,是不容忽視的課題。 我們站在通信服務的角度來分析,以光纖為主的整體服務數位網路將是我國邁向通信新紀元的里程碑,而以視覺為主的加值型高畫質視訊通信服務是時勢之所趨,因此,結合高解析電視及ISDN服務才能造就真正便捷,高水準的資訊活動,為達成以一目標,運用數位信號處理技術將使不同的介面可以輕易的整合,同時藉助其壓縮,編碼還能進一步強化網路的順暢,提昇使用效率,確保畫質穩定,更重要的是給用戶一個收費低廉的使用誘因。 本文的動機著眼於高解析電視與視覺通訊服務的結合,兩者目標均在於如何以最經濟有效的方式達成以高解析視訊為主的訊息傳遞。然而高解析電視時代的真正實現目前還是個未知數,但ISDN的通訊服務却是指日可待,所以本文的內容是站在通訊服務的站場來研究世界的趨勢,作為我國日後規劃的標準。 |
英文摘要 | The first development of a High Definition Television (HDTV) system, the MUSE system, was accomplished twenty years ago by the Japanese. European society then forms the team Eureka and develop the second HDTV prototype, the HD-MAC system. One common feature adopted in both systems is that they both use a combination of analog and digital processing techniques to do data compression so that the data transmission-time on a fixed communication channel, or the bandwidth of a communication channel under a fixed transmission-time, can be reduced significantly. In the United States of American, the Federal Communication Committee (FCC) announced in 1988 that bandwidth of a simultaneous broadcast cannot exceed 6 MHz, and then the American industry starts participating in the research and developments of HDTV systems. Under the basic analog/digital combinated structure used by the Japanese and the European, there exist technical difficulties for the HDTV systems to provide high quality Audio/Video signals without exceeding the 6 MHz bandwidth limit. Until 1990, the General Instrument propose a pure digital data compression technique to satisfy the bandwidth constraint, and provide high quality Audio/Video signals. The dramatic discovery astonished the television industry, and was recognized as the third industry revolution. Due to the nature constraint associated with the huge quantity of information involved in the transmission of video signal, 1G Bytes/s for a 1440×960 color video signals, the cost for transmission video signals would be to high to afford even the technical problems on the bandwidth of communication channels have been overcomed. Thus, how to compress the signal to construct an affordable system without sacrificing the picture quality is the most important topic. From the viewpoint of a telecommunication service provider, the integrated service digital network (ISDN) based on optic fiber will be the an important foothold for future telecommunication service. To use the high bandwidth provided by the optic fiber ISDN wisely, it is expected that the combination of ISDN and advanced data compression techniques will provide a convenient, high quality Audio/Video information expected that the combination of ISDN and advanced data compression techniques will provide a convenient, high quality Audio/Video information exchange network for next century. The report focus on the development of high quality video communication systems, including HDTV systems, which can be accomplished effectively and economical. It is for sure that the ISDN can be accomplished in the near future to provide better services. However, the availability of a commercial HDTV system is still questionable. We stand on a worldwide viewpoint to study and provide new waves in the future telecommunication industry. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。