通信英語(yǔ)教程(ppt32)-電子電信(已修改)
2025-08-24 20:50 本頁(yè)面
【正文】 UNIT 1 同位語(yǔ)跟在所修飾的名詞之后，可表示相同的事物或人，也可對(duì)該名詞進(jìn)行說(shuō)明。同位語(yǔ)與所修飾的名詞之間可以用各種標(biāo)點(diǎn)符號(hào)隔開(kāi)，這時(shí)同位語(yǔ)可以對(duì)標(biāo)點(diǎn)符號(hào)前的整個(gè)句子進(jìn)行說(shuō)明。 PCM is dependent on three separate operations, sampling, quantizing, and coding. ＊ Substances fall into three groups: conductors, semiconductors and insulators. ＊ The laser is able to amplify light ? one unique property. ＊ (9 4) can only be applied provided that the unsaturated gain coefficient exceeds the losses , a necessary requirement for oscillation. ＊ 這里列舉了同位語(yǔ)位于句尾，修飾最后一個(gè)名詞或整個(gè)句子的情況。還有其它的情況，課文中遇到時(shí)在講。 介詞短語(yǔ) for doing something 作后置定語(yǔ)，表示目的，意思為用于 ? 的。 Schemes for performing these three functions have evolved, and shall describe the main ones. ＊ algorithms for decoding received signals ＊ 這里的 ones 是代詞 , 避免重復(fù)。 ＊ A working equation expresses the unknown quantity in terms of the known ones. ＊ These equations are called differential equations, and now their study forms one of the most challenging branches of mathematics. ＊ We shall see how a speech channel be conveyed as a series of amplitude values, each value being represented as a sequence of 8 binary digits. 分詞短語(yǔ)出現(xiàn)在句尾，用逗號(hào)隔開(kāi)，表示伴隨情況說(shuō)明，非常常見(jiàn)。 ＊ 這時(shí)分詞短語(yǔ)的邏輯主語(yǔ)經(jīng)常省略。 ＊ 被省略的邏輯主語(yǔ)多數(shù)情況下指的是主句的主語(yǔ)或逗號(hào)前整個(gè)句子的含義，點(diǎn)也有少數(shù)列外。具體情況以后結(jié)合課文講解。 ＊ It is ? that (which, when, who) ? 強(qiáng)調(diào)句型，如 ＊ It is the document that is very important. It was Faraday who first discovered electromagic induction. known as the signaltonoise ratio 過(guò)去分詞短語(yǔ)作后置定語(yǔ) ，常見(jiàn)，譯為 稱之為 ? 。 ＊ of the most interest to ? , 對(duì) ? 最感興趣的 of interest = interesting of importance = important ＊ 名詞＋逗號(hào)＋同位語(yǔ) +逗號(hào) 進(jìn)行說(shuō)明 An American, Edison, invented the first small electric lamp. ＊ g, the acceleration of gravity at the earth’s surface, has the value 32 ft/sec2. ＊ 1. 正是數(shù)字傳輸為克服這種噪聲環(huán)境提供了一種有力的方法。 2. 數(shù)字傳輸正是對(duì)于克服這種噪聲環(huán)境提供了一種有力的方法。 3. 最高頻率為 64kHz的信號(hào)來(lái)表示的，這是一個(gè)我們昨天所學(xué)的事實(shí)。 4. 編碼器是將采樣幅值轉(zhuǎn)換成一組脈沖的單元，它對(duì)數(shù)字傳輸是非常重要的。 5. 編碼的問(wèn)題是一個(gè)極為重要的問(wèn)題。 6. PCM這個(gè)術(shù)語(yǔ)是一個(gè)通信術(shù)語(yǔ)。 7. 每采樣值 8位（碼）的重復(fù)速率比 4位的重復(fù)速率高。 8. 話音信號(hào)是一個(gè)模擬信號(hào)，通過(guò)采樣、量化和編碼，我們可以實(shí)現(xiàn)話音信號(hào)的數(shù)字傳輸。 漢譯英練習(xí)：（除第 8題外每題只用一個(gè)謂語(yǔ)動(dòng)詞） 1. 正是數(shù)字傳輸為克服這種噪聲環(huán)境提供了一種有力的方法。 It is digital transmission that provides a powerful method for overing the noisy environment. 2. 數(shù)字傳輸正是為克服這種噪聲環(huán)境提供了一種有力的方法。 It is for overing the noisy
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