lecture7digitaltelevision第七課數(shù)字電視(參考版)
2024-10-22 01:03本頁面
【正文】 。 ? As DTV can transmit TV programs as well as data, viewers will be able to receive not only TV but also a variety of interactive, multimedia services through DTV. ——由于數(shù)字電視不僅可以傳送電視節(jié)目，也可以傳送數(shù)據(jù)，因而觀眾不僅能接受電視節(jié)目，還能通過它獲得各種交互式的多媒體服務。 ? By using video pression technology, DTV enables several television programs to be digitally bined before they are carried on the same frequency channel. ——采用視頻壓縮技術，數(shù)字電視能夠在將多個電視節(jié)目調(diào)制到同一頻道上之前，先進行數(shù)位結合。 ? Sound and pictures are processed electronically into digital signals, which are then transmitted as a bit stream and reconverted by digital TV sets or appropriate settop boxes into television programs. ——聲音和圖像先被電子化處理成數(shù)字信號，然后這些數(shù)字信號以比特流的方式進行傳輸，再由數(shù)字電視機或配套的機頂盒重新轉換成電視節(jié)目。 ? Analogue transmission technology converts sound and pictures into continuously varying electric signals which, after transmission, are converted back to sound and pictures by television sets. ——模擬傳輸技術將聲音和圖像轉換為連續(xù)變化的電信號；在傳輸結束后，（這些電信號）再由電視設備還原成為聲音和圖像。 ——Television signals are subject to interference by other signal sources, by which the reception quality is less than ideal. Key words and Technical terms ? Digital Television (DTV) 數(shù)字電視 ? optical fiber 光纖 ? electromagic radiation 電磁輻射 ? telephone service 電信服務 ? valueadded service 增值服務 ? interactive enquiry 交互式查詢 ? phonebanking service 電話銀行服務 ? mobile phone technology 移動電話技術 ——the third generation mobile phone technology ? multimedia service 多媒體服務 ? multifunctional 多功能的 ——multifunctional media receiver ? cable TV work plan 電纜電視網(wǎng)絡計劃 ? digital satellite service
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